JPH05122805A - Electric traveling vehicle - Google Patents

Abstract

PURPOSE:To provide an electric traveling vehicle in which regenerative brake force for motor can be obtained accurately and easily according to various traveling conditions or the feeling of driver. CONSTITUTION:The electric traveling vehicle traveling while transmitting the driving force of a motor 1 to drive wheels 2, 2 comprises means 9 for controlling the motor 1 into regenerative brake state at the time of coasting and an operator 8 for setting the magnitude of regenerative brake force with respect to the control means 9. The control means 9 then controls the motor 1 so that regenerative brake force, being set by the operator 8, can be produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle that travels by transmitting a driving force of an electric motor to driving wheels.

[0002]

2. Description of the Related Art In an electric vehicle of this type, as disclosed in, for example, Japanese Patent Laid-Open No. 59-209004, an engine brake of a conventional engine vehicle is used during coasting on a downhill or during deceleration. It has been known in the past to provide a motor with a corresponding regenerative braking. As is well known, the regenerative braking is to apply electric braking to the electric motor while operating the electric motor as a generator by the inertial rotational force of the drive wheels and recovering the generated energy obtained at this time to a power source such as a battery. Is.

And, for example, the above-mentioned Japanese Patent Laid-Open No. 59-2090.
In the electric traveling vehicle disclosed in Japanese Patent Publication No. 04, the regenerative braking force according to the operation amount of the brake is generated in the electric motor, and the regenerative braking force according to the rotation speed of the electric motor is generated in the electric motor during coasting. I am trying.

However, in such an electric vehicle, the regenerative braking force generated in the electric motor is uniquely generated in accordance with the operation amount of the brake and the rotation speed of the electric motor, and therefore has the following disadvantages. It was

That is, for example, on a long downhill,
Although frequent braking is not desirable, in the case of an electric vehicle that produces a regenerative braking force according to the rotation speed of the electric motor during coasting as described above, the regenerative braking force due to the coasting alone produces various gradients. The regenerative braking force corresponding to the traveling on the downhill cannot be obtained, and therefore the driver must frequently perform the brake operation in order to obtain a sufficient braking force.

Further, although frequent braking operation is not preferable during traveling on a snowy road or during turning, it is not possible to obtain an accurate regenerative braking force according to the traveling condition only by the regenerative braking force by coasting. After all, the driver has to apply the braking operation as frequently as the above.

As described above, in the conventional electric vehicle, since the regenerative braking force is uniquely generated according to the operation amount of the brake and the rotation speed of the electric motor, it can be adapted to various traveling situations. In order to obtain the regenerative braking force, it is necessary to frequently operate the brake, and it is not possible to easily obtain an accurate regenerative braking force according to the driver's preference.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves such inconveniences and provides an electric vehicle capable of accurately and easily obtaining the regenerative braking force of an electric motor in accordance with various running situations and driver's preferences. The purpose is to provide.

[0009]

To achieve the above object, the present invention controls an electric vehicle in a regenerative braking state during coasting in an electric vehicle that travels by transmitting driving force of the electric motor to driving wheels. The control means is provided with an operator provided in the vehicle compartment so that the strength of the regenerative braking force of the electric motor can be set with respect to the control means, and the control means produces the regenerative braking force set by the operator. The feature is to control the electric motor accordingly.

[0010]

According to the electric vehicle of the present invention, during coasting,
The driver can change the strength of the regenerative braking force of the electric motor only by operating the operating element, and at this time, the electric motor is controlled by the control means so as to generate the regenerative braking force set by the operating element. Controlled by.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an electric vehicle according to the present invention will be described with reference to FIG.

FIG. 1 is a schematic configuration diagram for explaining the configuration of the main part of the electric vehicle.

In FIG. 1, 1 is an electric motor, and 2 and 2 are drive wheels. In this electric vehicle, the driving force of the electric motor 1 is
The CVT 3, which is a pulley / belt type continuously variable transmission, the clutch 4, and the differential gear mechanism 5 are sequentially transmitted to the drive wheels 2 and 2 to travel. In this case, the electric motor 1 is connected to the main battery 7 via a drive circuit 6 controlled by a controller 14 described later, and is supplied with electric power from the main battery 7 via the drive circuit 6 during power running and during regenerative braking. The generated energy is supplied to the main battery 7 via the drive circuit 6.

Further, in the figure, 8 is an operator for the driver to set various traveling modes and the like relating to the electric traveling vehicle, and 9 is a control means for controlling the operation of the electric motor 1 and the like.

The operator 8 is swingably provided in the passenger compartment of the electric vehicle around the support shaft 10. The driver swings and operates the operator 8 to, for example, park the vehicle. The "P range", the "R range" for reverse, and the "D range" for forward can be set. In this case, between the "P range", the "R range", and the "D range", the operating element 8 can be swung stepwise in each range, while "D range" is changed.
In the "range", it is possible to continuously swing within a predetermined angle.

At the position of the operator 8, a potentiometer 1 in the shape of a semi-circle is energized by the auxiliary battery 11.
2 is arranged centering on the support shaft 10, and the potentiometer 12 is contacted with a conductor contactor 13 which swings around the support shaft 10 in cooperation with the operating element 8. In this case, the conductor contact 13 receives a potential corresponding to the contact position with the potentiometer 12, and in the "D range", the conductor contact 13 is moved by continuous swinging of the operator 8. The electric potential received is designed to change continuously.

The control means 9 has a controller 14 including a CPU (not shown) and the like.
The potential signal of the conductor contactor 13 in each setting range of the operating element 8 has terminals 15p and 15 for each setting range.
It is input via r, 15d and the vehicle speed sensor 16
The vehicle speed signal detected by, the ON / OFF signal of the accelerator (not shown) detected by the accelerator sensor 17, the accelerator depression amount signal, and the like are input. Based on these input signals, the controller 14 controls the electric motor 1 via the drive circuit 6 and the clutch actuator 18 to control the engagement / disengagement of the clutch 4, and further the pulley actuators 19, 20.
The gear shift operation of the CVT 3 is controlled via the.

Next, the operation of such an electric vehicle will be described.

In this electric vehicle, for example, when the operator sets the "D range" by the driver and the accelerator is turned on, the controller 14 causes the electric motor 1 to perform powering according to the accelerator pedal depression amount. The electric motor 1 is controlled via the drive circuit 6 so that the CVT 3 is shifted at this time according to the vehicle speed or the like.

On the other hand, when the vehicle is traveling downhill or the like and the accelerator is turned off and the vehicle is coasting, the controller 14 causes the conductor contact 1 corresponding to the set position of the operator 8.
The electric motor 1 is controlled via the drive circuit 6 in order to generate the regenerative braking force according to the potential of 3 in the electric motor 1.

Specifically, for example, in FIG. 1, when the operator 8 is set to a position closer to the "R range" in the "D range", a relatively weaker or nearly zero regenerative braking force is applied to the electric motor. When the operator 8 is swung to the side away from the “R range”, a relatively strong regenerative braking force is generated in the electric motor 1, and the operator 8 changes the regenerative braking force. In the "D range", it is changed continuously as it is continuously swung. Such control of the regenerative braking force is performed, for example, by controlling the input voltage to the electric motor 1 and the field current.

Thus, in this electric vehicle,
The driver can arbitrarily change the regenerative braking force of the electric motor 1 only by swinging the operating element 8 in the “D range” during coasting, and for example, in a steep downhill, a stronger regenerative braking force can be obtained. If the operator 8 is set at a position where a regenerative braking force can be obtained, sufficient braking force can be obtained without frequent braking operation. Further, even when the vehicle is traveling on a snowy road or turning, if the operator 8 is swung to an appropriate position, an appropriate regenerative braking force can be obtained according to the traveling situation, the preference of the driving vehicle, and the like. ..

In this embodiment, the manipulator 8 can be continuously rocked in the "D range" so that the regenerative braking force of the electric motor 1 is continuously variable. However, the manipulator 8 is rocked stepwise. As a matter of course, the regenerative braking force of the electric motor 1 can be varied stepwise, and further, "R
It is needless to say that the operator 8 can be continuously or stepwise oscillated in the "range" so that the regenerative braking force of the electric motor 1 at the time of reverse travel can be continuously or stepwise varied.

Then, in this way, the "D range" and "R
In the “range”, examples of the operation pattern of the operator 8 when the operator 8 can be operated continuously or stepwise include those shown in FIGS. 2 (a) to 2 (i).

2A to 2C are operation patterns when the operator 8 is continuously operable in the "D range", and those shown in FIG. 2D are ,
Further, in the operation pattern when the operator 8 can be continuously operated in the "R range", the operation patterns shown in FIGS. 2 (e) to (g) can be operated stepwise in the "D range". Operation pattern in the case of
Shown in FIG. 7 are operation patterns when the operator 8 can be operated stepwise in the “R range”. In this case, in the operation patterns shown in FIGS. 2C, 2G, and 2I, the “N range” corresponding to the neutral range of the engine vehicle is provided.

[0026]

As is apparent from the above description, according to the electric traveling vehicle of the present invention, the setting of the strength of the regenerative braking force of the electric motor is made variable by the driver's operation of the operating element, so that the vehicle is coasted. By controlling the electric motor by the control means so as to generate the set regenerative braking force, the regenerative braking force of the electric motor can be accurately and easily obtained according to various traveling situations and driver's preference. it can.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram for explaining a configuration of a main part of an example of an electric vehicle of the present invention,

FIG. 2 is an explanatory diagram showing an operation pattern of an operator of the electric vehicle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Drive wheel, 8 ... Operator, 9 ... Control means.

Claims (1)

[Claims] 1. An electric traveling vehicle that travels by transmitting the driving force of an electric motor to driving wheels, and a control means for controlling the electric motor to a regenerative braking state during coasting, and controlling the strength of the regenerative braking force of the electric motor. An electric vehicle, comprising: an operator provided in the vehicle compartment so that the electric motor is controlled by the operator to generate the regenerative braking force set by the operator.