JP2000142157A - Electric drive assist vehicle - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the size of a power supply device of an electric driving force assist vehicle. An alternator (8) connected to an engine (1).
Is provided with a switch 7 for selectively connecting to the battery 5 / load 6 and the motor 4 on either side, and when the slip state is detected by the slip detecting means 12,
The control device 10 switches the changeover switch 7 to the motor 4 side, drives the actuator 15 to forcibly open the throttle valve 13 by a predetermined amount, and increases the intake air amount to increase the engine speed, thereby increasing the engine speed.
Increase the amount of power generation. [Effect] The amount of power generated when power is supplied from the generator to the motor in order to escape the slip state is increased by increasing the engine rotation by increasing the intake air amount in the gasoline engine. An inexpensive, lightweight and compact device using a conventional and generally used generator can be supplied without increasing the size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric driving force assist vehicle in which one of front and rear wheels is driven by an engine, and the other wheel can be driven by a motor.

[0002]

2. Description of the Related Art For example, JP-A-8-23 by the same applicant.
One of the front and rear wheels is driven by an engine disclosed in Japanese Patent No. 7811, and the other wheel is driven by a motor, and power is supplied to the motor when a wheel driven by the engine slips. There is an electric driving force assisted vehicle that drives the other wheel.

[0003]

However, there is a conventional electric driving force assisted vehicle as described above in which a battery is used as a power supply source.
In such a battery drive system, the size of the battery is increased to drive the wheels, and it is necessary to load a plurality of large batteries to secure the capacity, or to reduce the wiring capacity to supply a large current. There are problems such as the need to increase the size.

[0004]

In order to solve such a problem and realize a compact power supply device suitable for an electric driving force assisted vehicle, in the present invention, the driving wheel (2) is provided with an engine. (1.21), the driven wheel (3) can be driven by the motor (4),
When the slip state of the driving wheel (2) is detected by the slip detecting means (12), power is supplied to the motor (4) to drive the driven wheel (3) to assist the driving force. An electric driving force assisted vehicle, comprising: a control device (10) for controlling a power generation amount of a generator (8) connected to the engine (1);
Output increasing means (15, 16, 18) provided to increase the output of (21), and when the slip state is detected by the slip detecting means (12), the control device (10) Thus, the output of the engine (1.21) is increased by the output increasing means (15, 16, 18), and the electric power of the generator (8) is supplied to the motor (4).

According to this, even if one of the wheels connected to the engine is in a slip state, the power of the generator is supplied to the motor to drive the other wheel, so that the slip state can be easily escaped. At the same time, the output increase means forcibly increases the intake air amount of the engine in the case of a gasoline engine without depending on the normal throttle opening control, and increases the fuel injection amount in the case of a diesel engine. It is possible to increase the amount of power generated by the generator by increasing the engine speed, thereby increasing the power supply to the motor driving the other wheel. The assist force by the other wheel can be largely generated.

The generator (8) is connected to a vehicle electrical system (5.6) including a battery (6) and the motor (4).
A changeover switch (7) for selectively connecting to either side of the control device (1), and detecting the slip state by the slip detection means (12), the control device (1)
0), the switch (7) is switched to the motor (4) to supply power to the motor for driving the other wheel from a generator instead of a battery. There is no need to use a large capacity type.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to specific examples shown in the accompanying drawings.

FIG. 1 is a schematic layout diagram of an electric driving force assisted vehicle to which the present invention is applied. The vehicle shown in the figure is a front-wheel drive vehicle, in which an engine 1 mounted on the front of the vehicle drives a front wheel 2 as a driving wheel and a rear wheel 3 as a driven wheel provided on each of left and right. 4.

The circuit configuration of the above vehicle is shown below with reference to FIG. As shown in FIG. 2, a load 6 is also connected to the battery 5 as a vehicle electrical system.
The positive terminal of the battery 5 is connected to an alternator 8 via a changeover switch 7. The motor 4 is switched via the changeover switch 7 and the drive switch 9.
Are connected to the alternator 8. The switches 7 and 9 are controlled by a control unit 10 as a control device, and the control unit 10 controls the alternator 8 via a regulator 11.

Further, a slip detection signal from the slip detecting means 12 is input to the control unit 9. Detection data from various sensors (not shown) are input to the slip detection unit 12 as slip determination data in the slip detection unit 12, and include the vehicle speed V, the front wheel speed Wf, the rear wheel speed Wr, and the engine speed Ne. The shift position SP, the clutch state CL, etc.

FIG. 3 is a schematic diagram showing a main part of an intake air system of the gasoline engine 1 according to the present invention. As shown in the figure, a throttle valve 13 that is remotely operated by an accelerator pedal (not shown) is provided in an intake pipe 14 connected to the engine 1. A motor-driven actuator 15 capable of opening and closing a throttle valve is separately provided as an output increasing means. The actuator 15 is controlled by the control unit 9.

Next, referring to a flowchart of FIG. 4, a control procedure according to the present invention applied at the time of stacking a vehicle will be described below. In the first step ST1 of FIG. 4, it is determined whether or not a condition that allows the present control is satisfied. The operating conditions are, for example, that the engine 1 is rotating and that there is no abnormality in the electric system of the present system such as the motor 4 and the alternator 8. If the operating conditions are satisfied, the process proceeds to the second step ST2. If the operating conditions are not satisfied, the control after the second step ST2 is not performed.

In a second step ST2, the various detected values (vehicle speed V, wheel speed W of the front wheels 2, engine speed Ne, gear position SP, etc.) are taken in to determine the stuck state. Then, in the third step ST3, it is determined whether or not the vehicle is in a stuck state. In the present embodiment, the determination is made based on whether or not the drive wheel (the front wheel 2) has slipped.

For example, if the vehicle speed V is 30 km / h or less,
If the wheel speed W is higher than a predetermined ratio α with respect to the vehicle speed V, and if the clutch CL is on and the gear position SP is a first- or second-speed gear, an automatic vehicle In the case of, the slip of the front wheels 2, that is, the stuck state can be determined by the fact that the engine is rotating at a predetermined ratio β or more with respect to the vehicle speed V in consideration of the gear ratio. It is. Alternatively, it can be determined that the wheel speed difference between the front and rear wheels is equal to or greater than a predetermined value.

If it is determined in the third step ST3 that the vehicle is stuck according to the above-described determination conditions, the process proceeds to a fourth step ST4. If it is determined that the vehicle is not stuck, the control from the fourth step ST4 is performed. Not performed. In the fourth step ST4, the actuator 15 is driven to open the throttle valve 13 to the full open side by a predetermined amount. As a result, the amount of intake air to the engine 1 increases irrespective of the position of an accelerator pedal (not shown), the engine output increases, and the power generation amount of the alternator 8 also increases.

In the next fifth step ST5, the changeover switch 7 connecting the alternator 11 and the battery 6 is normally switched so that the electric power generated by the alternator 11 by the above-described power generation can be supplied to the motor 4. The process proceeds to the sixth step ST6. Sixth step ST6
Then, the drive switch 9 is turned on, and the motor 4 is operated by the current generated by the alternator 8. At this time, in the present embodiment, the duty of the power generation amount of the alternator 8 is controlled by controlling the regulator 11 by the control unit 10 while keeping the ON states of the switches 7 and 9 as they are.

The initial value of the duty ratio is set to a relatively small value, and a value (d + Δd) for increasing the duty ratio d by a predetermined amount in each control cycle in the next seventh step ST7.
It is determined whether or not the vehicle has left the stuck state in the next eighth step ST8. If it is determined that the vehicle is in the stuck state, the driving force is determined to be insufficient at the duty ratio d at that time, and the sixth step ST6 And returns to the seventh step ST
7, the duty ratio is increased, and the motor 4 is operated by the increased duty ratio d to increase the driving force of the rear wheel 3.

As described above, by repeating the sixth step ST6 to the eighth step ST8, the driving force of the rear wheel 3 is gradually increased by gradually increasing the duty ratio, so that the stack escapes smoothly. be able to. If it is determined that the player has left the stacked state, an eighth step S
The process proceeds from T8 to a ninth step ST9, in which the driving state of the actuator 15 is stopped.
In the next tenth step ST10, the output of the alternator 8 is reduced by reducing the duty ratio d.

In the next eleventh step ST11, the drive switch 9 is turned off, and the drive of the motor 4 is stopped. Then, in a twelfth step ST12, the changeover switch 7 is switched to the normal state, the operation of the motor 4 is stopped, the stack exit control is terminated, and the power of the alternator 8 is
And return to the normal state of supply to the load 5.

The duty ratio may be set to 0 instead of the duty ratio reduction control in the tenth step ST10, or the duty ratio d may be further reduced in the eleventh step ST11 in addition to the reduction in the duty ratio d in the tenth step ST10. The motor 4 may be stopped promptly, for example, by performing control to reduce the motor speed.

As described above, according to the present invention, the supply of the drive current to the motor 4 is performed not from the battery 6 but from the alternator 8, and when the slip in the stack or the like is detected, the intake air amount is positively increased. As a result, since the output (rotation) of the engine 1 is increased, the power generation amount of the alternator 8 is also increased, and a large driving force required for escape by driving the rear wheel 3 can be obtained.

When it becomes necessary to drive the motor 4 as described above, the number of rotations is increased to increase the amount of power generation.
An increased power generation amount can be obtained without increasing the size of the alternator 8, and a conventionally used alternator can be used. Also, there is no need to increase the size of the battery 6 and the capacity of cables and the like.
With a simple circuit configuration in which a changeover switch 7 is provided in the middle of a conventional power supply line, an inexpensive system can be constructed, and the device can be made lightweight and compact. Further, since the electric power of the battery 6 is not used for driving the motor, the battery is not deteriorated and the reliability of the system can be improved.

The output increasing means applied to the gasoline engine is not limited to the example shown in FIG.
It is sufficient that the intake air amount to the engine 1 can be increased separately from the throttle valve 13. For example, as shown in FIG. 5, a bypass which bypasses the throttle valve 13 is provided in parallel with the intake pipe 14, and, for example, an electromagnetic on-off valve 16 is provided in the bypass. Accordingly, in the fourth step ST4, the solenoid of the on-off valve 16 is excited to open the valve and drive the air to flow through the bypass, thereby increasing the intake air amount and increasing the engine output. The other control is the same as described above.
The present invention is also applicable to a diesel engine, an example of which is shown below with reference to FIG. In the diesel engine 21 shown in FIG. 6, a fuel injection valve 17 is provided on a cylinder head of the diesel engine 21. The injection amount is controlled. Accordingly, even in the case of the diesel engine 21, the engine output can be increased by performing the fuel injection amount increase control by the fuel injection control device 18 instead of the actuator drive in the fourth step ST4. The other control is the same as described above.

[0024]

As described above, according to the present invention, when one wheel connected to the engine is in a slip state, the power supplied to the motor driving the other wheel is supplied to the gasoline engine by the output increasing means. This is done by increasing the amount of air or increasing the amount of fuel injected by the diesel engine to increase the engine speed and increase the amount of power generated by the generator. It is possible to obtain an increased amount of power generation by using the generator, and it is not necessary to increase the size of the battery and the capacity of cables and the like. Without changing the power supply system, it is possible to supply inexpensive, lightweight, and compact devices, as well as without battery deterioration and reliability. It is possible to supply a high electric driving force assist vehicle with.

[Brief description of the drawings]

FIG. 1 is a schematic layout diagram of an electric driving force assisted vehicle to which the present invention is applied.

FIG. 2 is a schematic configuration diagram of an electric circuit of an electric driving force assisted vehicle to which the present invention is applied.

FIG. 3 is a schematic diagram showing an example of an output increasing unit based on the present invention.

FIG. 4 is a control flow chart based on the present invention.

FIG. 5 is a diagram corresponding to FIG. 3, showing a second embodiment of the output increasing means;

FIG. 6 is a view corresponding to FIG. 3, showing a third embodiment of the output increasing means;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Front wheel 3 Rear wheel 4 Motor 5 Load 6 Battery 7 Changeover switch 8 Generator 10 Control unit 12 Slip detecting means 15/16 Actuator 18 Fuel injection amount control device 21 Engine

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) TE02 TO21 TO30

Claims (2)

[Claims] When a driving wheel is driven by an engine, a driven wheel is driven by a motor, and a slip detection unit detects a slip state of the driving wheel,
An electric driving force assisted vehicle that assists driving force by supplying electric power to the motor to drive the driven wheels, and a control device that controls a power generation amount of a generator connected to the engine. Output increasing means provided to increase the output of the engine, and when the slip state is detected by the slip detecting means, the output of the engine is output by the output increasing means by the control device. An electric driving force assisted vehicle which increases the power of the generator and supplies the electric power to the motor. 2. A switch for selectively connecting the generator to one of a vehicle electrical system including a battery and the motor is provided, and the slip detecting means detects the slip state. 2. The electric driving force assist vehicle according to claim 1, wherein the control device switches the changeover switch to the motor side.