U.S. patent application number 15/822211 was filed with the patent office on 2019-05-30 for electricity aided bicycle and auxiliary power controlling method thereof.
This patent application is currently assigned to Metal Industries Research & Development Centre. The applicant listed for this patent is Metal Industries Research & Development Centre. Invention is credited to Cheng-Yen Chen, Chang-Ching Lin, I-Chiao Tsai.
Application Number | 20190161138 15/822211 |
Document ID | / |
Family ID | 66634838 |
Filed Date | 2019-05-30 |
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United States Patent
Application |
20190161138 |
Kind Code |
A1 |
Lin; Chang-Ching ; et
al. |
May 30, 2019 |
ELECTRICITY AIDED BICYCLE AND AUXILIARY POWER CONTROLLING METHOD
THEREOF
Abstract
An electricity aided bicycle and an auxiliary power controlling
method thereof are provided. The electricity aided bicycle includes
a driving circuit, a rotating speed detector and a command voltage
generator. The driving circuit receives a command voltage, and
drives an auxiliary motor of the electricity aided bicycle based on
the command voltage. The rotating speed detector generates a
detection signal having a plurality of pulses based on a rotation
status of a driving gear of the electricity aided bicycle. The
command voltage generator receives the detection signal, and is
configured to: calculate times between two adjacent pulses in the
detection signal, operate numerical value derivation operation
based on the times to generate an estimated velocity value, set an
electricity aid strategy table and calculate the command voltage
based on the estimated velocity value and the electricity aid
strategy table.
Inventors: |
Lin; Chang-Ching; (Kaohsiung
City, TW) ; Chen; Cheng-Yen; (Kaohsiung City, TW)
; Tsai; I-Chiao; (Kaohsiung City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Metal Industries Research & Development Centre |
Kaohsiung |
|
TW |
|
|
Assignee: |
Metal Industries Research &
Development Centre
Kaohsiung
TW
|
Family ID: |
66634838 |
Appl. No.: |
15/822211 |
Filed: |
November 27, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B62M 6/50 20130101; H02P
6/17 20160201; B62M 6/45 20130101; B60L 50/20 20190201; H02P 31/00
20130101; B60L 15/20 20130101; B60L 2200/12 20130101; B60L 2240/427
20130101 |
International
Class: |
B62M 6/50 20060101
B62M006/50; H02P 31/00 20060101 H02P031/00; B60L 15/20 20060101
B60L015/20 |
Claims
1. An electricity aided bicycle, comprising: a driving circuit,
receiving a command voltage and driving an auxiliary motor of the
electricity aided bicycle based on the command voltage; a rotating
speed detector, generating a detection signal having a plurality of
pulses based on a rotation status of a driving gear of the
electricity aided bicycle; and a command voltage generator, coupled
to the rotating speed detector and the driving circuit, receiving
the detection signal, and configured to: calculate a plurality of
times between two adjacent pulses in the pulses of the detection
signal; perform a numerical value derivation operation based on the
times to generate an estimated velocity value; set an electricity
aid strategy table to calculate the command voltage based on the
estimated velocity value and the electricity aid strategy table,
wherein the electricity aid strategy table records a relation
between an electricity aid ratio and the estimated velocity value,
wherein the times comprise a first time, a second time, and a third
time, the command voltage generator calculates a plurality of
reciprocals of the first time, the second time, and the third time,
and performs the numerical value derivation operation based on the
third time and the reciprocals, wherein the estimated velocity
value is equal to 1 T K + 1 2 [ 1 T K - 1 T K - 1 ] + T K 8 [ 1 T K
- 1 T K - 1 T K - 1 T K - 1 - 1 T K - 2 T K - 1 ] , ##EQU00002##
wherein TK is the third time, TK-1 is the second time, and TK-2 is
the first time.
2. The electricity aided bicycle as claimed in claim 1, wherein the
command voltage generator sets a detection cycle and periodically
detects whether each of the pulses is generated in the detection
signal based on the detection cycle.
3. The electricity aided bicycle as claimed in claim 2, wherein the
detection cycle is one millisecond.
4. The electricity aided bicycle as claimed in claim 1, wherein the
command voltage generator comprises: a processor, calculating the
times, performing the numerical value derivation operation based on
the times to generate the estimated velocity value, and calculating
the command voltage based on the electricity aid strategy table and
the estimated velocity value; and a lookup table, coupled to the
processor, storing the electricity aid strategy table, and
providing the electricity aid strategy table to the processor.
5. The electricity aided bicycle as claimed in claim 4, wherein the
command voltage generator further comprises: a filter, coupled to
the processor, receiving and filtering the detection signal, and
providing a filtered detection signal to the processor.
6. (canceled)
7. (canceled)
8. The electricity aided bicycle as claimed in claim 1, wherein the
electricity aid ratio is negatively proportional to the estimated
velocity value.
9. The electricity aided bicycle as claimed in claim 1, wherein in
the electricity aid strategy table, the estimated velocity value
less than a first reference velocity value corresponds to a first
electricity aid ratio, the estimated velocity value between the
first reference velocity value and a second reference velocity
value corresponds to a second electricity aid ratio, and the
estimated velocity value greater than the second reference velocity
value corresponds to a third electricity aid ratio, wherein the
first reference velocity value is less than the second reference
velocity value, the first electricity aid ratio is greater than the
second electricity aid ratio, and the second electricity aid ratio
is greater than the third electricity aid ratio.
10. The electricity aided bicycle as claimed in claim 1, wherein
the driving circuit comprises: a multiple phase command voltage
generator, coupled to the command voltage generator and generating
a plurality of multiple phase command voltages; and a driving
signal generator, coupled to the multiple phase command voltage
generator and generating a plurality of driving signals based on
the phase command voltages to drive the auxiliary motor.
11. The electricity aided bicycle as claimed in claim 1, wherein
the driving circuit further comprises: a voltage detector, coupled
to the auxiliary motor, detecting a plurality of driving phase
voltages of the auxiliary motor and generating a plurality of
feedback signals; and an operator, coupled to the multiple phase
command voltage generator and the voltage detector, respectively
performing an operation between the phase command voltages and the
feedback signals, and providing a plurality of after-operation
phase command voltages to the driving signal generator.
12. The electricity aided bicycle as claimed in claim 1, wherein
the command voltage generator is disposed on a circuit board, and
the circuit board is detachably coupled to the electricity aided
bicycle.
13. An auxiliary power controlling method, adapted for an
electricity aided bicycle, comprising: receiving a command voltage
and driving an auxiliary motor of the electricity aided bicycle
based on the command voltage by a driving circuit; generating a
detection signal having a plurality of pulses based on a rotation
status of a driving gear of the electricity aided bicycle;
calculating a plurality of times between two adjacent pulses in the
pulses of the detection signal, wherein the times comprise a first
time, a second time, and a third time; performing a numerical value
derivation operation based on the times to generate an estimated
velocity value, comprises: calculating a plurality of reciprocals
of the first time, the second time, and the third time; and
performing the numerical value derivation operation based on the
third time and the reciprocals; setting an electricity aid strategy
table to calculate the command voltage based on the estimated
velocity value and the electricity aid strategy table, wherein the
electricity aid strategy table records a relation between an
electricity aid ratio and the estimated velocity value, wherein the
estimated velocity value is equal to 1 T K + 1 2 [ 1 T K - 1 T K -
1 ] + T K 8 [ 1 T K - 1 T K - 1 T K - 1 T K - 1 - 1 T K - 2 T K - 1
] , ##EQU00003## wherein TK is the third time, TK-1 is the second
time, and TK-2 is the first time.
14. The auxiliary power controlling method as claimed in claim 13,
wherein calculating the times between two adjacent pulses in the
pulses of the detection signal comprises: setting a detection cycle
and periodically detecting whether each of the pulses is generated
in the detection signal based on the detection cycle.
15. (canceled)
16. (canceled)
17. The auxiliary power controlling method as claimed in claim 13,
wherein the electricity aid ratio is negatively proportional to the
estimated velocity value.
18. The auxiliary power controlling method as claimed in claim 13,
wherein setting the electricity aid strategy table comprises:
setting a first reference velocity value and a second reference
velocity value; and setting that the estimated velocity value less
than the first reference velocity value corresponds to a first
electricity aid ratio, the estimated velocity value between the
first reference velocity value and the second reference velocity
value corresponds to a second electricity aid ratio, and the
estimated velocity value greater than the second reference velocity
value corresponds to a third electricity aid ratio, wherein the
first reference velocity value is less than the second reference
velocity value, the first electricity aid ratio is greater than the
second electricity aid ratio, and the second electricity aid ratio
is greater than the third electricity aid ratio.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The invention relates to an electricity aided bicycle, and
particularly relates to an auxiliary power controlling method for
an electricity aided bicycle capable of calculating a reliable
estimated speed.
2. Description of Related Art
[0002] In the design of control over an auxiliary motor of an
electricity aided bicycle in the known art, the velocity is
detected and converted into a pedaling torque force based on
Newton's Second Law of Motion (F=a), and an auxiliary force is
supplied at a ratio of 1:1. However, based on such calculation, an
unstable detection signal may be obtained through the velocity
detection in the known art when the user rides uphill or on an
unstable ground. In the obtained detection signal, the acceleration
(a) may be discontinuous values, so the pedaling force (F) obtained
through calculation is also unstable. Hence, the auxiliary motor of
the electricity aided bicycle is unable to output an optimal
auxiliary force to properly help the user. Also, when there is a
greater error in the calculation of the pedaling force, the
auxiliary force output by the auxiliary motor may be excessive, and
such power may disturb or even hurt the user.
SUMMARY OF THE INVENTION
[0003] One or some embodiments of the invention provides an
electricity aided bicycle and an auxiliary power controlling method
thereof capable of providing a stable auxiliary force when a
movement velocity is low.
[0004] An electricity aided bicycle according to an embodiment of
the invention includes a driving circuit, a rotating speed detector
and a command voltage generator. The driving circuit receives a
command voltage, and drives an auxiliary motor of the electricity
aided bicycle based on the command voltage. The rotating speed
detector generates a detection signal having a plurality of pulses
based on a rotation status of a driving gear of the electricity
aided bicycle. The command voltage generator is coupled to the
rotating speed detector and the driving circuit. The command
voltage generator receives the detection signal, and is configured
to: calculate times between two adjacent pulses in the detection
signal, operate numerical value derivation operation based on the
times to generate an estimated velocity value, set an electricity
aid strategy table and calculate the command voltage based on the
estimated velocity value and the electricity aid strategy table.
The electricity aid strategy table records a relation between an
electricity aid ratio and the estimated velocity value.
[0005] An auxiliary power controlling method according to an
embodiment of the invention is adapted for an electricity aided
bicycle. The controlling method includes: generating a detection
signal having a plurality of pulses based on a rotation status of a
driving gear of the electricity aided bicycle; calculating a
plurality of times between two adjacent pulses in the pulses of the
detection signal; performing a numerical value derivation operation
based on the times to generate an estimated velocity value; and
setting an electricity aid strategy table to calculate the command
voltage based on the estimated velocity value and the electricity
aid strategy table. In addition, the electricity aid strategy table
records a relation between an electricity aid ratio and the
estimated velocity value.
[0006] Based on the above, in the embodiments of the invention, the
detection signal is generated by detecting the rotation status of
the driving gear, the times between the adjacent pulses in the
detection signal are calculated, and the numerical value derivation
operation is performed based on the times to obtain the estimated
velocity value. In addition, the command voltage is calculated
based on the estimated velocity value with reference to the
electricity aid strategy table. Accordingly, a stable command
voltage may be generated under a condition that the electricity
aided bicycle is at a low movement velocity, and the auxiliary
motor may generate a stable auxiliary power to make riding more
comfortable.
[0007] To make the above features and advantages of the invention
more comprehensible, embodiments accompanied with drawings are
described in detail as follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The accompanying drawings are included to provide a further
understanding of the invention, and are incorporated in and
constitute a part of this specification. The drawings illustrate
embodiments of the invention and, together with the description,
serve to explain the principles of the invention.
[0009] FIG. 1 is a block diagram illustrating an electricity aided
bicycle according to an embodiment of the invention.
[0010] FIG. 2 is a schematic view illustrating signal detection
according to an embodiment of the invention.
[0011] FIG. 3 is a schematic view illustrating a command voltage
generator according to an embodiment of the invention.
[0012] FIG. 4 is a schematic view illustrating a command voltage
generator according to another embodiment of the invention.
[0013] FIG. 5 is a schematic view illustrating a command voltage
generator according to yet another embodiment of the invention.
[0014] FIG. 6 is a schematic view illustrating an electricity aid
strategy according to an embodiment of the invention.
[0015] FIG. 7 is a schematic view illustrating an electricity aided
bicycle according to another embodiment of the invention.
[0016] FIG. 8 is a flowchart illustrating an auxiliary power
controlling method of an electricity aided bicycle according to an
embodiment of the invention.
DESCRIPTION OF THE EMBODIMENTS
[0017] Reference will now be made in detail to the present
preferred embodiments of the invention, examples of which are
illustrated in the accompanying drawings. Wherever possible, the
same reference numbers are used in the drawings and the description
to refer to the same or like parts.
[0018] Referring to FIG. 1, FIG. 1 is a block diagram illustrating
an electricity aided bicycle according to an embodiment of the
invention. An electricity aided bicycle 100 includes a driving
circuit 110, a rotating speed detector 120, and a command voltage
generator 130. The driving circuit 110 is coupled to an auxiliary
motor MOT of the electricity aided bicycle 100, receives a command
voltage V*, and drives the auxiliary motor MOT of the electricity
aided bicycle 100 based on the command voltage V*. The rotating
speed detector 120 detects a rotation status of a driving gear C1
of the electricity aided bicycle 100 and generates a detection
signal DS based on the rotation status of the driving gear C1 of
the electricity aided bicycle 100. Moreover, the detection signal
DS has a plurality of pulses. More specifically, when the driving
gear C1 of the electricity aided bicycle 100 rotates through
pedaling of a rider, a pulse is generated in the detection signal
DS in correspondence to each time when a rotation angle of the
driving gear C1 exceeds a predetermined angle. In other words, a
fixed number of pulses are generated in the detection signal DS
after one cycle of rotation of the driving gear C1.
[0019] Besides, in the embodiments of the invention, the command
voltage generator 130 is coupled to the rotating speed detector 120
and the driving circuit 110. The command voltage generator 130
receives the detection signal DS through the rotation detector 120.
In addition, the command voltage generator 130 calculates times
between two adjacent pulses in the pulses of the detection signal
DS and performs a numerical value derivation operation based on the
plurality of times obtained, so as to generate an estimated
velocity value. The command voltage generator 130 also sets an
electricity aid strategy table and calculates the command voltage
V* based on the estimated velocity value and the electricity aid
strategy table. The electricity aid strategy table records a
relation between an electricity aid ratio and the estimated
velocity value.
[0020] To be more specific, referring to FIGS. 1 and 2, FIG. 2 is a
schematic view illustrating signal detection according to an
embodiment of the invention. During an initial period when the
electricity aided bicycle is being started, or when the electricity
aided bicycle is ridden uphill or on a non-flattened ground, the
rotation of the driving gear C1 may not be smooth and may be
discontinuous. Thus, in the continuous pulses generated in the
detection signal DS, the times between two adjacent pulses are not
the same. A detection cycle with a fixed time interval may be set
by the command voltage generator 130. Based on the set detection
cycle, the command voltage generator 130 may periodically detect
whether a pulse is generated in the detection signal DS. in FIG. 2,
starting from a detection starting point TS, the command voltage
generator 130 may continuously detect whether a pulse is generated
in the detection signal DS in a plurality of detection time
intervals TD1 to TDN. In addition, lengths of the time intervals
TD1 to TDN are fixed and equivalent to the set detection cycle.
According to an embodiment of the invention, the detection cycle
may be set at one millisecond. Of course, in other embodiments of
the invention, the detection cycle may be set differently by the
designer based on an actual status of the electricity aided bicycle
without any specific limitation.
[0021] In the time interval TD1, no pulse is generated in a
detection signal DS1. In the subsequent time interval TD2, a pulse
PS1 is generated in the detection signal DS1. Under the
circumstance, the command voltage generator 130 may calculate time
required from the starting point TS to the time when the pulse PS1
is generated to obtain a time T.sub.K-2.
[0022] The command voltage generator 130 may continuously detect
the detection signal DS1, and detect a second pulse PS2 of the
detection signal DS1 in a time interval TD.sub.M+1. Then, the
command voltage generator 130 may calculate time required between
the pulse PS1 and the pulse PS2 to obtain a time T.sub.K-1. Then,
the command voltage generator 130 continuously detects the
detection signal DS1, and detect a third pulse PS3 of the detection
signal DS1 in a time interval TD.sub.N. The command voltage
generator 130 thus calculates time between the pulse PS2 and the
pulse PS3 to obtain a time T.sub.K.
[0023] After obtaining the times T.sub.K-2, T.sub.K-1, and T.sub.K,
the command voltage generator 130 may perform the numerical value
derivation operation based on the times T.sub.K-2, T.sub.K-1, and
T.sub.K to generate the estimated velocity value accordingly. In an
embodiment of the invention, the command voltage generator 130 may
calculate an estimated velocity value VE based on the times
T.sub.K-2, T.sub.K-1, and T.sub.K and reciprocals (inverse elements
of multiplication) of the times T.sub.K-2, T.sub.K-1, and T.sub.K.
The calculation may be represented in Formula (1) below:
VE = 1 T K + 1 2 [ 1 T K - 1 T K - 1 ] + T K 8 [ 1 T K - 1 T K - 1
T K - 1 T K - 1 - 1 T K - 2 T K - 1 ] ( 1 ) ##EQU00001##
[0024] The command voltage generator 130 may continuously detect
the detection signal DS. In addition, under a condition that new
pulses are continuously generated in the detection signal DS, the
command voltage generator 130 may perform the numerical value
derivation operation based on the latest three sequential times to
generate the latest estimated velocity value VE.
[0025] Besides, generating the estimated velocity value by
performing the numerical value derivation operation based on the
three times T.sub.K-2, T.sub.K-1, and T.sub.K is merely described
as an example. The numerical value derivation operation in the
embodiments of the invention may be performed based on a greater
number of times.
[0026] In the following, details about the electricity aid strategy
table are described. The electricity aid strategy table may be set
in a memory apparatus, and the memory apparatus may be built in or
externally connected to the command voltage generator 130. In an
embodiment, the electricity aid strategy table may be in the form
of a lookup table and record the relation between the electricity
aid ratio and the estimated velocity value VE. The electricity aid
strategy table indicates the amount of auxiliary power that the
auxiliary motor MOT is required to generate. When the electricity
aid ratio is higher, the auxiliary motor MOT is required to
generate more auxiliary power. When the electricity aid ratio is
lower, the auxiliary motor MOT is required to generate less
auxiliary power. In the electricity aid strategy table, the
electricity aid ratio is negatively proportional to the estimated
velocity value VE.
[0027] Referring to FIG. 3, FIG. 3 is a schematic view illustrating
a command voltage generator according to an embodiment of the
invention. A command voltage generator 300 includes a processor 310
and a lookup table 320. The processor 310 receives the detection
signal DS and is coupled to the lookup table 320. The electricity
aid strategy table is recorded in the lookup table 320. The
processor 310 detects a pulse generation state in the detection
signal DS and obtains a plurality of times between adjacent pulses.
Then, the numerical value derivation operation is then performed
continuously based on the times, so as to generate the estimated
velocity value VE. Based on the estimated velocity value VE, the
processor 310 performs a lookup operation in the lookup table 320
and obtains the electricity aid ratio corresponding to the
estimated velocity value VE. The processor 310 also generates the
command voltage V* based on the electricity aid ratio.
[0028] Referring to FIG. 4, FIG. 4 is a schematic view illustrating
a command voltage generator according to another embodiment of the
invention. A command voltage generator 400 includes a filter 410,
format converters 420 and 450, a lookup table 430, and a processor
440. The filter 410 receives the detection signal DS and filters
out noises of the detection signal DS. The filtered detection
signal DS is transmitted to the format converter 420 for signal
format conversion. In the embodiment, the format converter 420 is
an analog-to-digital converter.
[0029] The processor 440 receives a detection signal in a digital
format, and generates the command voltage based on the electricity
aid strategy table in the lookup table 430. The format converter
450 converts the signal format of the command voltage generated by
the processor 440 to generate the command voltage V* in an analog
format. In the embodiment, the format converter 450 is a
digital-to-analog converter.
[0030] In the embodiments shown in FIGS. 3 and 4, the processors
310 and 440 may be processors having a computing capability.
Alternatively, the processors 310 and 440 may be hardware circuits
designed based on the hardware description language (HDL) or any
other digital circuit design methods that people having ordinary
skill in the art are familiar with and implemented in the form of
field programmable gate array (FPGA), complex programmable logic
device (CPLD), or application-specific integrated circuit
(ASIC).
[0031] The lookup tables 320 and 430 may be implemented in any
memory apparatuses that people having ordinary skills in the art
are familiar with, such as memories in an arbitrary form. The
filter 410 may be implemented as a filter circuit that people
having ordinary skills in the art are familiar with. Also, the
format converters 420 and 450 may be implemented as any
analog-to-digital converter circuits and digital-to-analog
converter circuits that people having ordinary skills in the art
are familiar with. In other words, the invention does not intend to
impose a specific limitation on this regard.
[0032] Referring to FIG. 5, FIG. 5 is a schematic view illustrating
a command voltage generator according to yet another embodiment of
the invention. In FIG. 5, the command voltage generator 500 may be
implemented on a circuit board 510 as a modularized apparatus
(e.g., a command voltage generator module 501). A connector 520 is
disposed on the circuit board 510. Moreover, the circuit board 510
may be detachably connected to the corresponding electricity aided
bicycle through the connector 520. When at least one of the
velocity estimation method or the electricity aid strategy of the
electricity aided bicycle requires modification, such modification
may be carried out by simply replacing the command voltage
generator module 510. Hence, the manufacture and assembling of the
electricity aided bicycle is facilitated.
[0033] The connector 520 may be a connector in an arbitrary form.
The goldfinger-type connector shown in FIG. 5 merely serves as an
example and is not intended to serve to limit the invention.
Moreover, other circuit devices may also be disposed on the circuit
board 510. The invention does not intend to impose a specific
limitation on this regard.
[0034] Referring to FIG. 6, FIG. 6 is a schematic view illustrating
an electricity aid strategy according to an embodiment of the
invention. In an embodiment of the invention, during setting of the
electricity aid strategy, a plurality of reference velocities VR1
to VR3 and a plurality of corresponding electricity aid ratios R1
to R2 may be set. In an example where the reference velocity VR1 is
less than the reference velocity VR2, the reference velocity VR2 is
less than the reference velocity VR3, and the electricity aid ratio
R2 is greater than the electricity aid ratio R1, when the estimated
velocity value is less than the reference velocity value VR1, the
electricity aid strategy correspondingly provides the relatively
greater electricity aid ratio R2, and when the estimated velocity
value is between the reference velocity values VR1 and VR2, the
electricity aid strategy correspondingly provides the relatively
lower electricity aid ratio R1. When the estimated velocity value
is greater than the reference velocity value VR2, the corresponding
electricity aid ratio in the electricity aid strategy is 0.
[0035] Referring to FIG. 7, FIG. 7 is a schematic view illustrating
an electricity aided bicycle according to another embodiment of the
invention. An electricity aided bicycle 700 includes a command
voltage generator 710, a driving circuit 720, a voltage detector
730, a filter 740, a Hall detector 750, a rotating speed detector
760, and operators OP1 to OP3. The command voltage generator 710
generates a command voltage V* and provides the command voltage V*
to the driving circuit 720. The driving circuit 720 includes a
multiple phase command voltage generator 721 and a driving signal
generator 722. The multiple phase command voltage generator 721
generates multiple phase command voltages V.sub.a*, V.sub.b*, and
V.sub.c* based on the command voltage V*, and provides the multiple
phase command voltages V.sub.a*, V.sub.b*, and V.sub.c* to the
operators OP1 to OP3. The operators OP1 to OP3 respectively perform
subtract operations between the multiple phase command voltages
V.sub.a*, V.sub.b*, and V.sub.c* and a plurality of feedback
signals, and transmit generated operation results to the driving
signal generator 722.
[0036] The driving signal generator 722 is configured to generate a
plurality of driving signals Q1 to Q6 and drives a transistor Tx
through the driving signals Q1 to Q6, thereby providing a driving
voltage to the auxiliary motor MOT.
[0037] Moreover, the voltage detector 730 is coupled to the
auxiliary motor MOT, detects a plurality of driving phase voltages
V.sub.a, V.sub.b, and V.sub.c of the auxiliary motor MOT, and
generates the feedback signals. The feedback signals are filtered
at the filter 740 to filter out noises, and are provided to the
operators OP1 to OP3 for the subtract operations.
[0038] Besides, the Hall detector 750 detects a rotation status
.theta..sub.e of the auxiliary motor MOT, and transmits the
detected rotation status .theta..sub.e to the multiple phase
command voltage generator 721 as the basis for the multiple phase
command voltage generator 721 to generate the multiple phase
command voltages V.sub.a*, V.sub.b*, and V.sub.c*.
[0039] The rotating speed detector 760 detects the rotation status
of the driving gear of the electricity aided bicycle 700 and
generates the detection signal DS.
[0040] Referring to FIG. 8, FIG. 8 is a flowchart illustrating an
auxiliary power controlling method of an electricity aided bicycle
according to an embodiment of the invention. At Step S810, a
detection signal having a plurality of pulses is generated based on
a rotation status of a driving gear of the electricity aided
bicycle. At Step S820, a plurality of times between two adjacent
pulses in the pulses of the detection signal is calculated. At Step
S830, a numerical value derivation operation is performed on the
times to generate an estimated velocity value. Then, at Step S840,
an electricity aid strategy table is set, and a command voltage is
calculated based on the estimated velocity value and the
electricity aid strategy table.
[0041] Details concerning the respective steps are already
described in detail in the above embodiments and thus will not be
repeated in the following.
[0042] In view of the foregoing, in the embodiments of the
invention, the rotation status of the driving gear is detected to
generate the detection signal having the pulses. In addition, the
numerical value derivation operation is performed based on the
times between the pulses of the detection signal, so as to generate
a stable estimated velocity value. In addition, the electricity aid
strategy table is set in the embodiments of the invention to
provide the electricity aid ratio. Hence, the auxiliary motor is
able to provide an appropriate auxiliary power more effectively,
and the convenience of use and the safety of the electricity aided
bicycle are facilitated.
[0043] It will be apparent to those skilled in the art that various
modifications and variations can be made to the structure of the
present invention without departing from the scope or spirit of the
invention. In view of the foregoing, it is intended that the
present invention cover modifications and variations of this
invention provided they fall within the scope of the following
claims and their equivalents.
* * * * *