JP2000085675A - Motor-assisted bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To help users of motor-assisted bicycles to wheel them without effort by actuating the electric motor to output wheeling assist force in consideration for the users' physical strength and condition and road conditions among others. SOLUTION: The motor-assisted bicycle employs a driveline using man power and a driveline including an electric motor 11 so that the driving force of the electric motor 11 assists the man-power driveline and users in wheeling the bicycle. For this purpose, a stroke detection means 29 detects the stroke of brake levers 30 at the handlebars, and a controller 18 controls the wheeling assist force of the electric motor 11 depending on fluctuations in output voltage of the stroke detection means 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle having an electric motor mounted on a vehicle body, and assisting pedal depression with an auxiliary driving force output from the electric motor, thereby enabling the vehicle to travel uphill or travel while receiving a headwind. Related to an assisted electric bicycle.

[0002]

2. Description of the Related Art In this type of electric assisted bicycle, a weak auxiliary driving force (hereinafter referred to as pushing assisting force) is applied to an electric motor not only during normal running but also when pushing down a bicycle on a steep slope or the like. ) Is output to reduce the effort of pushing and walking the vehicle body.

[0003] Such an electric assisted bicycle is disclosed, for example, in Japanese Patent Application Laid-Open No. 4-358988 and Japanese Patent Application Laid-Open No. 8-12773.
No. 86 is disclosed. JP-A-Hei 4-3
The electric assisted bicycle disclosed in Japanese Patent No. 58988 discloses a push-walking determining means for determining a state of walking while pushing a vehicle body with a hand, and a pushing-walking speed (2 to 3 km / sec. h).

The electric assist bicycle disclosed in Japanese Patent Application Laid-Open No. 8-127386 switches the drive system by the electric motor to the push-walk mode when pushing the vehicle body.
The electric motor generates a torque corresponding to a difference between a torque required to push and walk the entire vehicle body and a virtual torque required to push and walk the vehicle body by removing a constant load from the entire vehicle body. It is.

That is, in this conventional example, the electric motor does not bear all of the force required to push and walk the entire vehicle body. The weight required to push and walk the bicycle) is not borne by the electric motor, but is borne by human power.

[0006]

In the prior art described above, the electric assisted bicycle disclosed in Japanese Unexamined Patent Publication No. 4-358988 has a constant walking speed (2 to 3 km / h) slightly lower than the walking speed. And Japanese Patent Laid-Open No. 8-1
The electric assisted bicycle disclosed in Japanese Patent No. 27386 also controls at a constant speed of 2 to 3 km / h when pushing and walking.

[0007] However, the running speed of a person greatly varies depending on the physical strength difference between each person (young and old people, women, etc.), the slope of a slope, and the degree of traffic congestion. Therefore, in each of the above-described conventional examples in which the vehicle speed is controlled to a constant speed (2 to 3 km / h), the vehicle body may operate differently from the intention of the person depending on the person and road conditions, and the operability is significantly reduced. was there.

In each of the above conventional examples, when the driving torque by human power is 0, the vehicle speed is a certain speed or more in the forward direction, and the grip of the handlebar is gripped, the pushing and walking assist force is inevitably output. Is configured. Therefore, when it is desired to make a sudden stop in a crowded place or when the vehicle suddenly goes downhill, the grip is held and the pushing and walking assisting force is output. Therefore, when the vehicle travels on a downhill with the pushing-walking assist force output, there is a problem that the vehicle speed further increases and the operability is further reduced.

Furthermore, in each of the above-mentioned conventional examples, the vehicle speed at the time of forward movement is detected, and the assist is performed at a pushing / walking speed slightly lower than the walking speed. There was a problem that it could not be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. A first object of the present invention is to provide a method for pushing a battery-assisted bicycle by pushing and walking.
Female, etc.), physical condition, slope of slope, traffic congestion degree, etc., to output an assisting force to the electric motor to make the electric motor easy to push, and to facilitate the operation of sudden stop. .

A second object of the present invention is to improve the effectiveness of the brake and reduce the power consumption.

Further, a third object of the present invention is to eliminate a push-walk switch which is turned on during a push-walk.

Still another object of the present invention is to enable a brake to be applied immediately when pushing and walking is stopped, and to be able to set on a stand or a bicycle parking machine in that state.

A fifth object of the present invention is to prevent the displacement amount detecting means for detecting the displacement amount of the brake lever from directly colliding with the ground or other objects when the vehicle body falls or runs. .

[0015]

In order to achieve the first object, an electric assist bicycle according to the present invention is provided with a drive system using human power and a drive system using an electric motor. A displacement detecting means for detecting a displacement of a brake lever attached to a handlebar; and a displacement detecting means for detecting a displacement of a brake lever attached to a handlebar. A controller for controlling a pushing assisting force by the electric motor based on a change in an output voltage of the detecting means.

According to a second aspect of the present invention, there is provided an electric assisted bicycle according to the present invention, wherein the controller according to the first aspect of the present invention includes a controller immediately before the brake lever is activated. It is controlled to turn off the auxiliary force by pushing.

Further, in order to achieve the third object,
In the electric assisted bicycle according to the present invention, as described in claim 3, the controller described in claim 1 controls to turn on the pushing and walking assisting force by the displacement of the brake lever.

Furthermore, in order to achieve the fourth object, the electric assisted bicycle according to the present invention, as described in claim 4, is characterized in that the displacement detecting means according to claim 1 comprises a left and right brake lever. Of these, it was attached to the left brake lever.

And, in order to achieve the fifth object,
In the electric assist bicycle according to the present invention, as described in claim 5, the displacement detecting means according to claim 1 or 4 is installed below the left brake lever and behind the traveling direction of the vehicle body.

When the electric assist bicycle is constructed as in claim 1, the displacement of the brake lever is detected by the displacement detecting means, and the controller controls the electric motor based on the change in the output voltage of the displacement detecting means. By controlling the pushing assist power, when pushing the electric assisted bicycle, the size matching the physical strength difference of the pushing person (youth and old man, woman, etc.), physical condition, slope of slope, traffic congestion, etc. The assisting force of the pushing is output to the electric motor to facilitate the pushing, and the operation of the sudden stop is facilitated by the brake lever.

When the electric assisted bicycle is constructed as in claim 2, the controller turns off the push-walking assisting force immediately before the brake lever starts to apply the brake, thereby applying the brake against the pushing-walking assisting force. So that the brakes work better and
Power consumption can be reduced.

When the electric assisted bicycle is constructed as in claim 3, the controller may turn on the pushing / walking assisting force by the displacement of the brake lever, thereby eliminating the pushing / walking switch which is turned on at the time of pushing / walking. it can.

When the electric assisted bicycle is constructed as in claim 4, the displacement amount detecting means is attached to the left one of the left and right brake levers, so that the brake can be applied immediately when pushing and stopping. In that state, it is possible to put on a stand or set on a bicycle parking machine.

When the electric assisted bicycle is constructed as in claim 5, the displacement amount detecting means is provided below the left brake lever and at the rear side in the traveling direction of the vehicle body, so that the displacement amount detecting means can be used when the vehicle body falls or runs. It is possible to prevent the displacement amount detecting means for detecting the displacement amount of the brake lever from directly colliding with the ground or another object.

[0025]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view showing an embodiment of an electric assist bicycle according to the present invention.

As shown in FIG. 1, the electric assisted bicycle includes a body frame 1 made of, for example, a metal tube. The handle bar 5 is provided freely on the front fork 3 via a handle post 4. On the other hand, the body frame 1
A rear wheel 6 is pivotally supported at a rear portion of the vehicle body 1, and a saddle 8 is installed at a center upper portion of the body frame 1 via a saddle post 7.

Then, at the lower center of the body frame 1,
An electric assist device (power unit) 10 is mounted. The electric assist device 10 includes devices such as an electric motor 11, a resultant device 12, a torque sensor 13, and the like, and a crankshaft 14 is pivotally supported so as to penetrate in the vehicle width direction. A pair of left and right cranks 15 are rotatably fixed to both ends, and pedals 16 are rotatably provided at the distal ends of both cranks 15, respectively.

Further, the electric assist device 1 is mounted on the crankshaft 14.
A drive sprocket (not shown) located on the right side of the wheel 0 is mounted on the shaft, and a drive chain 17 (or drive belt) is wound around the drive sprocket and a driven sprocket (not shown) provided on the right side of the rear wheel 6. .

Further, a controller 18 for controlling the output of the electric motor 11 is mounted on the upper part of the electric assist device 10, and the controller 18 is a control device constituted by a microcomputer or the like. On the other hand, a frame cover 20 made of synthetic resin or the like covers from the front half of the body frame 1 to the electric assist device 10 and the controller 18.
A battery unit 21 serving as one power supply is detachably provided. A key-type main switch 22 is provided on the front end side surface of the frame cover 20, and the main switch 22 is turned on to start the electric assist bicycle.

Left and right grips 23 are provided at both ends of the handlebar 5. Of these grips 23, a push-walk switch 24 is attached to the handlebar 5 near the left grip 23.

A vehicle speed sensor 2 is provided on the axle of the front wheel 2.
The vehicle speed sensor 26 is used to detect the vehicle speed during normal running and also to detect the vehicle speed and the vehicle speed change during execution of the push-walk motor control described later.

Further, a saddle switch 2 is provided in the saddle 8.
The saddle switch 28 is provided as one means for determining whether or not the power-assisted bicycle is in a pushing-walking state. The saddle switch 28 detects whether or not there is a load applied to the saddle 8. It is determined whether or not a person is sitting on the saddle 8, and the determination signal is sent to the controller 1
8 In this embodiment, for example, when a person sits on the saddle 8, the saddle switch 28 is turned off.

FIG. 2 is a block diagram showing a control system in one embodiment of the electric assist bicycle according to the present invention. FIG.
As shown in FIG.
1, devices such as a torque sensor 13, a battery unit 21, a push / walk switch 24, a vehicle speed sensor 26, a saddle switch 28, and a displacement sensor (position sensor) 29 as a displacement amount detecting means are connected.

During normal running of the battery-assisted bicycle, the crankshaft 14 of the battery-assisted device 10 is driven forward by the occupant sitting on the saddle 8 depressing the pedal 16 with his / her foot. At the same time, the electric motor 11 in the electric assist device 10 is operated, and the driving torque of the crankshaft 14 (pedal force P) and the output of the electric motor 11 (auxiliary driving force M) are combined.
2 and the resultant force P + M is transmitted to the rear wheel 6 via the drive chain 17.

At this time, the torque sensor 13 always detects the driving torque applied to the crankshaft 14 and sends the data to the controller 18. The controller 18 calculates a pedal depression force P from the driving torque data, and controls the electric motor so that the ratio (assist ratio) between the pedal depression force P and the auxiliary driving force M always becomes a constant ratio (for example, 1: 1). 11 is controlled. In this manner, the pedaling force P is greatly reduced by the assist of the auxiliary driving force M, so that traveling uphill or traveling while receiving a headwind is greatly facilitated.

The controller 18 outputs a weak auxiliary driving force (push-walking assist force m) to the electric motor 11 not only during normal running as described above, but also when walking while pushing the vehicle body. It is programmed to perform "push-and-walk motor control" to reduce labor.

Whether or not the push-walking motor control can be executed is determined by the controller 18 based on any of the following conditions. That is, (1) when the main switch 22 is on and the torque sensor 13 does not detect the driving torque applied to the crankshaft 14, (2) when the main switch 22 is on and the saddle switch 28 is on,
(3) when the main switch 22 is on and the push-walk switch 24 is on, (4) when the main switch 22 is on and the push-walk switch 24 is on, and when the torque sensor 13 does not detect the driving torque applied to the crankshaft 14. , (5)
When the main switch 22 is on, the push-walk switch 24 is on, and the saddle switch 28 is on, (6) the main switch 22 is on, the push-walk switch 24 is on, the saddle switch 28 is on, and the torque sensor 13 is on the crankshaft 14. This is the time when the drive torque applied to is not detected.

As described above, the push-walk motor control determines whether or not the controller 18 is in the push-walk controllable state. If the controller 18 determines that the push-walk control is possible, the displacement amount of the brake lever 30 is determined. Based on the (angle), the assisting force or the pushing speed required for the pushing and walking is detected, and the pushing and walking assisting force m required for this is calculated and output to the electric motor 11.

This pushing walking assist force m is calculated by the displacement sensor 2
9 is controlled by the controller 18 based on the change in the output voltage. And the output voltage of the displacement sensor 29 is
It changes based on the amount of displacement (angle) of the brake lever 30 attached to the grip 23 of the handlebar 5.

Next, the mounting structure of the brake lever will be described with reference to FIGS. 3 is a partial sectional plan view showing the brake lever of FIG. 1, FIG. 4 is a front view of FIG. 3, FIG. 5 is a sectional view taken along line AA of FIG. 3, and FIG. 6 is a line BB of FIG. FIG. 7 is a bottom view showing a rotating state of the brake lever of FIG. In addition, the brake lever of FIGS. 3-7 has shown the left brake lever.

As shown in FIGS. 3 and 6, the lever bracket 31 is wound around the handlebar 5 adjacent to the left grip 23, and the bracket nut 33 is screwed into the bracket nut 33, so that the handlebar 5 is rotated.
Fixed to A bracket cover 34 is fixedly attached to the lever bracket 31.
As shown in FIG. 5, a lever bush 35 provided in the brake lever 30 is fitted into 1, and a lever rivet 36 is inserted into and fixed to the lever bush 35. It is firmly fixed so that it can move (displace).

As shown in FIG. 3, an end of a brake cable 37 is guided to the lever bracket 31, and a drum-shaped engaging portion 38 is fixed to this end. On the other hand, one end of a nipple puller 39 is rotatably fixed to the brake lever 30 by a puller rivet 40, and a locking portion 38 fixed to an end of a brake cable 37 is fitted to the other end of the nipple puller 39. The brake cable 30 is rotated through the nipple puller 39 by rotating the brake lever 30 around the lever rivet 36.
7 is configured to apply a tension brake.

Further, as shown in FIGS. 4 and 7, the displacement sensor (position sensor) 29 is fixed by two sensor screws 41 below the brake lever 30 and behind the traveling direction of the vehicle body. . The displacement sensor 29 includes a contact plate 42 whose measuring needle 29 a extends toward the brake lever 30 and is provided in the brake lever 30.
Is in contact with

The brake lever 30 constructed as described above
When the brake lever 30 is rotated (displaced), the contact plate 42 of the brake lever 30 also moves, so that the measuring needle 29a of the displacement sensor 29 extends, and the amount of extension is detected as the displacement of the brake lever 30. Is done.

The displacement of the brake lever 30 is shown in FIG.
As shown in (1), the output voltage of the displacement sensor 29 is regarded as a change, and the data is sent to the controller 18. The controller 18 controls the pushing and walking assisting force of the electric motor 11 based on the change in the output voltage.

Next, the relationship between the displacement of the brake lever 30 and the pushing / walking assisting force will be described with reference to FIGS. 7 to 9A and 9B. When the push-walk switch 24 is turned on and the brake lever 30 is turned (displaced) as shown by an arrow a1 in FIG. 7, the displacement sensor 29 is turned on as shown in FIG.
The output voltage of the electric motor 11 gradually increases, and the driving force of the electric motor 11 is controlled to increase as shown in FIGS. I do. However, an upper limit (MAX) is set so that excessive pushing and walking assistance force and vehicle speed do not occur.

Next, when the brake lever 30 is rotated as indicated by an arrow a2, the electric motor 11 is rotated as shown in FIG.
Stops, and the vehicle speed does not increase as shown in FIG. 9 (B). As a result, the pushing and walking assisting power is turned off.

The range of rotation of these brake levers 30 is
The brake play range, as described above,
There is some brake play area after stopping. Therefore, the push-walking assisting force is turned off immediately before the brake starts to work. Further, when the brake lever 30 is rotated, the brake starts to work, and the brake force is maximized when the brake lever 30 abuts on or near the grip 23.

On the other hand, the push / walk switch 24 is eliminated, and in FIG. 7, the brake lever 30 is turned off at a position 0 where the brake lever 30 is not rotated, as indicated by an arrow b1. When the power is turned on and the brake lever 30 is further turned as shown by the arrow b2,
Similarly to the above, the output voltage of the displacement sensor 29 gradually increases as shown in FIG. 8, and the driving force of the electric motor 11 can be increased or the vehicle speed can be increased as shown in FIGS. 9 (A) and 9 (B). it can. In addition, the relationship between the rotation range of the brake lever 30 and the play range and effective range of the brake is the same as described above.

FIG. 10 is a bottom view showing another embodiment in which the push-and-walk switch 24 is eliminated from the brake lever 30. In this embodiment, as shown in FIG. 10, after the brake lever 30 has turned from the OFF1 position to OFF2, the push-walking assisting force is turned on at the position where the brake lever 30 is slightly returned as shown by the arrow c1. , And arrow c
When the brake lever 30 is rotated as shown in FIG. 2, the output voltage of the displacement sensor 29 gradually increases as shown in FIG. 8 as described above, and as shown in FIGS. 11 can be increased or the vehicle speed can be increased. Further, when the brake lever 30 is returned as shown by the arrow c3, the pushing / walking assisting force is turned off (OFF1).

Further, the pushing and walking assisting force is the upper limit value (MAX).
When the brake lever 30 is gripped and turned from the state where the pressure has reached, the pushing and walking assisting force gradually decreases, and the pushing and walking assisting force is turned off (OFF2). Then, when the brake lever 30 is gripped and turned, the brake starts to work through the brake play range, and the brake force is maximized when the brake lever 30 abuts on or near the grip 23.

Hereinafter, the flow of the push-walk motor control will be described with reference to FIG.
This will be described based on the flowchart shown in FIG. In this flowchart, it is assumed that a push-walk switch 24 is provided, and the state determination (6) in which the push-walk motor control can be executed is taken as an example.

First, after the control is started, it is determined whether or not the saddle switch 28 is turned on in step S1, and if step S1 is YES, it is determined in step S2 that the torque sensor 13 is not operating. That is, in step S2, the drive torque T due to the pedal depression force P is detected, and it is determined whether the drive torque T is equal to or less than a certain value. Here, the constant value is, for example, about one half of the minimum drive torque required for starting the vehicle body. Furthermore, if step S2 is YES, it is determined in step S3 whether or not the push / walk switch 24 is on.

If NO in steps S1, S2, and S3, that is, if the saddle switch 28 is off in step S1, it is a state in which a person is sitting on the saddle 8, and in step S2 the torque sensor 13 is not in operation. In this state, the driving torque T is equal to or higher than a predetermined value, and the push-walk switch 24 is in an off state in S3. In such a state, the process proceeds to step S4. In this step S4, the electric motor 11 is controlled so that the assist ratio of the auxiliary driving force M to the pedal depression force P is always constant. The output is controlled and the push-walk motor control is not performed.

If YES in step S3, the displacement sensor 29 detects the amount of displacement of the brake lever 30 in step S5, and proceeds to step S6. In this step S6, it is determined whether or not the electric motor 11 is within the range of the push-walk assistance. If it is within the range of the push-walk assistance, the brake lever 3 is determined in the step S7.
The drive amount of the electric motor 11 corresponding to the displacement amount of 0 is calculated, and in step S8, the push-walk motor control is executed according to the drive amount.

On the other hand, in step S6, if the electric motor 11 is outside the range of the push-walk assist, the process proceeds to step S9, and the push-walk motor control is stopped.

By repeating the control routine as described above, it is always determined whether the electric assist bicycle is in the normal running state or the push-walking state, and the optimal driving force M or the brake is optimally determined. The pushing / walking assist force m corresponding to the displacement amount of the lever 30 is output from the electric motor 11.

As described above, according to the above-described embodiment, the displacement amount of the brake lever 30 is detected by the displacement sensor 29, and based on the change in the output voltage of the displacement sensor 29, the controller 18 uses the electric motor 11 to push the walking aid. , It is possible to finely control the pushing walking assisting force, that is, the pushing walking speed. As a result, when pushing and walking the electric assisted bicycle, the pushing assisting power of a size commensurate with the physical strength difference of the pushing person (young and old people, women, etc.), physical condition, slope of slope and traffic congestion etc. The output can be output to the motor to facilitate the pushing.

When the brake lever 30 is depressed, the brake is immediately applied, so that the operation of sudden stop is facilitated.

Further, according to the above embodiment, the controller 18 turns off the push-walking assisting force immediately before the brake lever 30 starts to apply the brake, so that the brake is not applied against the pushing-walking assisting force. Therefore, the effectiveness of the brake is improved and the power consumption can be reduced.

Further, according to the above embodiment, the controller 18 can eliminate the push-walk switch 24 which is turned on at the time of the push-walk by turning on the push-walk assist force by the displacement of the brake lever 30. The number of parts can be reduced.

Furthermore, according to the above-described embodiment, the displacement sensor 29 is attached to the left brake lever 30 of the left and right brake levers, so that the brake is immediately applied when the pushing and walking stops, and in that state, It is possible to put on a stand or set on a bicycle parking machine. In addition, since many people stand and push on the left side of the electric assisted bicycle, attaching the displacement sensor 29 to the left brake lever 30 improves usability and improves versatility.

According to the above-described embodiment, the displacement sensor 29 is disposed below the left brake lever and behind the traveling direction of the vehicle body, so that the displacement sensor 29 can be placed on the ground when the vehicle body falls or runs. Direct collisions with other objects can be avoided.

The above-described configurations can be widely applied to not only electric assist bicycles but also electric scooter type vehicles, electric wheelchairs, and other electric vehicles and lawn mowers.

[0066]

As described above, according to the first aspect of the present invention,
According to the method, the displacement amount of the brake lever is detected by the displacement amount detecting means, and the controller controls the pushing and walking assisting force by the electric motor based on the change of the output voltage of the displacement amount detecting means, so that the electric assist bicycle can be controlled. When pushing and walking, an electric motor can output a pushing and walking assisting force of a size appropriate for the physical strength difference, physical condition, road conditions, and the like of the pushing person, thereby facilitating the pushing and walking. As a result, operability can be significantly improved. In addition, since the brake is applied immediately by gripping the brake lever, the operation of sudden stop is facilitated.

According to the second aspect of the present invention, the controller reduces the power consumption while improving the effectiveness of the brake by turning off the pushing and walking assisting force immediately before the brake lever starts to apply the brake. Can be.

According to the third aspect of the present invention, the controller can turn on the pushing / walking assisting force by the displacement of the brake lever, thereby eliminating the pushing / walking switch which is turned on at the time of pushing / walking. While reducing
Operability can be improved.

According to the fourth aspect of the present invention, the displacement amount detecting means is attached to the left one of the left and right brake levers, so that the brake is immediately applied when the pushing and walking stops, and in that state, It is possible to put on a stand or set on a bicycle parking machine, which improves usability.

According to the fifth aspect of the present invention, the displacement amount detecting means is provided below the left brake lever and at the rear side in the traveling direction of the vehicle body. Can be prevented from directly colliding with the ground or other objects, and is less likely to be damaged.

[Brief description of the drawings]

FIG. 1 is a left side view showing an embodiment of an electric assist bicycle according to the present invention.

FIG. 2 is a block diagram showing a control system in one embodiment of the electric assist bicycle according to the present invention.

FIG. 3 is a partial sectional plan view showing the brake lever of FIG. 1;

FIG. 4 is a front view of FIG. 3;

FIG. 5 is a sectional view taken along the line AA in FIG. 3;

FIG. 6 is a sectional view taken along the line BB of FIG. 3;

FIG. 7 is a bottom view showing the rotating state of the brake lever of FIG. 3;

FIG. 8 is a graph showing the relationship between the displacement of a brake lever and its output voltage.

FIGS. 9A and 9B are diagrams showing a relationship between a displacement amount of a brake lever, a driving force of an electric motor, and a vehicle speed, respectively.

FIG. 10 is a bottom view showing a brake lever in another embodiment of the electric assist bicycle according to the present invention.

FIG. 11 is a flowchart showing the flow of push-walk motor control in one embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Front wheel 3 Front fork 4 Handle post 5 Handlebar 6 Rear wheel 7 Saddle post 8 Saddle 10 Electric auxiliary device 11 Electric motor 12 Combining device 13 Torque sensor 14 Crankshaft 15 Crank 18 Controller 22 Main switch 23 Grip 24 Push walking Switch 26 Vehicle speed sensor 28 Saddle switch 29 Displacement sensor (displacement amount detecting means) 29a Measurement needle 30 Brake lever 37 Brake cable

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02P 7/00 H02P 7/00 A F term (Reference) 3D041 AA12 AA37 AA65 AA74 AB00 AC30 AD00 AD12 AD41 AD51 AE00 AE45 3D046 AA09 BB03 GG02 HH02 HH22 5H115 PA08 PA11 PG04 PG10 PI16 PI29 PU01 QN02 TB01 TO04 TO23 UI24 5H570 AA21 AA30 BB03 BB20 CC04 DD01 FF07 JJ03 LL12 LL40

Claims (5)

[Claims] A motor-assisted bicycle which is provided with a drive system by human power and a drive system by an electric motor 11 and assists the drive system by human power with the driving force of the electric motor 11 and assists driving when pushing and walking. Displacement detecting means 2 for detecting the displacement of the brake lever 30 attached to the brake lever 5
9 and a controller 18 for controlling a pushing assisting force of the electric motor 11 based on a change in an output voltage of the displacement amount detecting means 29. 2. The electric assisted bicycle according to claim 1, wherein the controller controls the pushing / walking assisting force to be turned off immediately before the brake lever 30 starts to apply the brake. 3. The electric assist bicycle according to claim 1, wherein the controller controls the pushing / walking assisting force to be turned on by the displacement of the brake lever. 4. The electric assist bicycle according to claim 1, wherein the displacement amount detecting means 29 is attached to a left brake lever 30 of the left and right brake levers. 5. The battery-assisted bicycle according to claim 1, wherein the displacement amount detecting means is provided below the left brake lever and behind the traveling direction of the vehicle body.