JPS63263189A - Auxiliary power device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auxiliary power device, and is particularly suitable for use in a bicycle with an auxiliary power.

[Summary of the invention]

It has a DC motor as an auxiliary power source, and only when there is a drive input to the driven system, the motor rotates to assist acceleration, and when there is no acceleration, the motor automatically stops, eliminating the need for troublesome power source operations. It is an auxiliary power unit that saves energy and provides good operability.

[Conventional technology]

Various types of bicycles with auxiliary power have been proposed, and some have been put into practical use. Generally, human power and auxiliary power are switched, and the auxiliary power device is activated only when necessary.

[Problem that the invention aims to solve] Frequently turning on and off the auxiliary power source is cumbersome, and the auxiliary power source may end up working even when it is not needed, resulting in a lot of wasted energy. .

In consideration of this problem, the present invention enables the auxiliary power source to work only when accelerating the driven system, and automatically turns off when acceleration is not required, thereby reducing energy consumption and reducing human effort. The purpose is to provide almost the same natural maneuverability as when using only a single vehicle.

[Means for solving problems]

The auxiliary power device of the present invention includes an auxiliary power DC motor 1 coupled to a driven system. This motor 1 has a power supply voltage E
The drive transistor Q2 detects the induced electromotive force generated at the terminals of the motor 1 and supplies the drive transistor Q2.
A terminal voltage detection transistor Q1 is provided to turn on the terminal voltage detection transistor Q1. This terminal voltage detection transistor is momentarily turned off periodically by the pulse generating circuit 7, and periodically detects the motor terminal voltage. A switch S that detects whether or not an auxiliary input to the driven system is necessary and forcibly turns off the drive transistor when the auxiliary input is not required to the driven system.
W is further provided.

[Effect]

When an attempt is made to accelerate the driven system, the auxiliary power motor l connected to the driven system is rotated by an external force, and an induced electromotive force is generated at its terminal. This electromotive force is the detection transistor Q1
The driving transistor Q2 is turned on by the detection output.

Therefore, the motor 1 automatically rotates to assist in acceleration.

The terminal voltage of the motor 1 is monitored by periodically turning off the detection transistor Q1. When acceleration is stopped, motor 1 is restrained and stopped, so the induced electromotive force disappears,
Since the detection transistor Q1 does not turn back on, the drive transistor Q2 also turns off.

Switch SW that detects the necessity of auxiliary input to the driven system
detects the cessation of acceleration and immediately turns off the motor 1, so no unnatural force is required to stop the motor 1.

〔Example〕

FIG. 1 shows an auxiliary power circuit for a bicycle showing one embodiment of the present invention. A battery E and a DC motor 1 are used as auxiliary power sources. The motor 1 (M) is mechanically connected to a crank gear 3 (front sprocket) via a speed reducer 2 (G), as shown in the bicycle route map in FIG. The rest of the structure of the bicycle is the same as a normal one.

The motor 1 is connected to the battery via a drive transistor Q2. The base of this transistor Q2 is a resistor R
2 to the collector of a detection transistor Q1 that detects the terminal voltage of the motor l. The base and emitter of the detection transistor Ql are connected between both terminals of the motor 1 via a resistor R1 and an acceleration detection switch SW, which will be described later.

Therefore, when pedal 4 is pressed during acceleration, the driving force is transferred to chain 5.
is transmitted to the rear wheels via the motor 1, and the motor 1 rotates. Therefore, an induced electromotive voltage is generated at the terminals of the motor 1. When this induced electromotive voltage exceeds the base-emitter forward voltage of transistor Ql, a base current flows to Ql through resistor R1, turning Ql on. Then, the collector current of the transistor Ql flows through the resistor R5, the collector voltage decreases, and the base current flows into the transistor Q2 through the resistor R2, turning on Q2. Therefore, a driving voltage is supplied to the motor 1, and the motor rotates, driving the crank gear 3 to rotate, thereby assisting the acceleration of the bicycle.

A switching transistor Q4 and a resistor R4 are connected symmetrically to the drive transistor Q2 and its base resistor R2 so as to be turned on by the detection transistor Q1. When this transistor Q4 is turned on, the power supply voltage is supplied to the pulse generating circuit 7, and a dwarf pulse of a predetermined period is generated. This positive pulse turns on transistor Q3 through resistor R3, so the base of detection transistor Q1 connected to the collector of Q3 is grounded.
Ql is momentarily turned off periodically.

The presence or absence of the terminal voltage of the motor 1 is detected each time the detection transistor Q1 is turned off. If motor l is rotating,
Because of the induced electromotive force, transistor Q1 periodically turns off and then turns on again. Therefore, the power supply to the motor 1 is connected through the drive transistor Q2. Note that when the detection transistor Q1 is turned off, the switching transistor Q4 is also turned off, so a capacitor CI is connected across the pulse generation circuit 7 to stabilize its oscillation operation.

When acceleration is not necessary, if the pedal 4 is stopped being depressed, the motor 1 is stopped and its induced electromotive force is eliminated. Therefore, after the detection transistor Q1 is further turned off by the output pulse of the pulse generating circuit 6, Ql will not be turned on again.

When the pedal 4 is stopped being depressed, an unnatural force is required to stop the motor l.

For this reason, the acceleration detection switch SW inserted into the emitter of the detection transistor Q1 is turned off when no acceleration is occurring, forcing the transistors Q1 and Q2 to turn off.

This switch SW may be, for example, a mint switch for detecting slack in the chain 5, as shown in FIG. Alternatively, it may be a switch that detects slippage of a ratchet wheel in the freewheel 6 (rear sprocket) of the rear wheel or synchronous rotation with the rear sprocket. Further, the switch SW may be inserted in series with the drive transistor Q2. Note that in order to prevent the motor l from rotating when the brake is operated, a switch that is turned off when the brake is operated may be added in series with the switch SW.

Note that when the pedal 4 is rotated in the reverse direction, the motor 1 reverses and an induced electromotive force is generated, but this electromotive force is generated in the opposite direction to the direction that turns on the detection transistor Q1, so the drive circuit will not turn on. do not have.

The present invention is not limited to the above-described embodiments, but can be applied to operating devices, steering devices, transportation devices, and the like.

(Effects of the Invention) As described above, the present invention automatically detects the drive input to the driven system, starts the auxiliary power motor, and automatically stops the motor when the motor is not accelerating, so there is no need for troublesome power source operations. In addition, it reduces energy waste and provides good operability.

In addition, since acceleration is detected by detecting the motor's terminal voltage (induced electromotive force), the circuit configuration is simple and the motor can be reliably controlled even when the power supply voltage fluctuates, eliminating terminal voltage. Since the motor drive current is cut off when the motor is locked, there is no risk of the motor being burned out by the locking current.

In addition, since the motor terminal voltage is detected by momentarily turning off the transistor for detecting the terminal voltage periodically, the motor does not operate at all during non-acceleration, making it safe. Furthermore, a switch means is provided to detect the necessity of auxiliary input, and the motor is turned off when not accelerating, making it even safer.There is also no need to apply restraining force when stopping the motor, resulting in natural operation performance. is obtained.

[Brief explanation of drawings]

FIG. 1 is an auxiliary power circuit diagram of a bicycle with auxiliary power to which the present invention is applied, FIG. 2 is a schematic diagram of the bicycle, and FIG. 3 is a detailed view of the main parts of the bicycle's drive system. In addition, in the symbols used in the drawings, 1-...---1-----...---Auxiliary power DC motor 2--------1-----Reducer 3-
・−・−・−・−−−−−−・−Crank gear 4・
・・・・・・−−m−−・・−Pedal 5−−−−−−・
−・−・−・−Chain 6−・−−−1−・・・・−・−
−−1−～Free foil 7・・−・−・−・・・・
-Pulse generation circuit Q 1-1-----------
Terminal voltage detection transistor Q2−・−・・・・Drive transistor E・・・・−・〜−−−−・・・・−・
...It's a battery.

Claims (1)

[Claims] A DC motor for auxiliary power coupled to a driven system, a drive transistor that supplies a power supply voltage to the motor, and a terminal voltage detection transistor that detects an induced electromotive voltage generated at a terminal of the motor and turns on the drive transistor. , a pulse generation circuit that momentarily turns off this terminal voltage detection transistor periodically, and a pulse generation circuit that detects the need for auxiliary input to the driven system and forces the above drive transistor when the auxiliary input is not required for the driven system. An auxiliary power device comprising a switch for turning off