JP2661257B2 - Travel control device for electric vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a travel control device for an electric vehicle, and more particularly, to cutting off a drive current of a vehicle drive motor when charging a battery with an external power supply. The present invention relates to a travel control device for an electric vehicle that is stopped.

(Prior Art) Conventionally, as this type of travel control device for an electric vehicle, there is, for example, one as shown in FIGS.
No. 0531).

3 and 4, reference numeral 1 denotes an armature coil, 2 denotes a field coil, and the armature coil 1 and the field coil 2 constitute a DC series motor 4 for driving a vehicle using a battery 3 as a power source. The electric motor 4 changes its rotation direction (corresponding to the traveling direction of the vehicle) depending on the direction of the current flowing through the field coil 2. 6 switches this current direction.

A current detector 7 and a chopper 8 are provided between the armature coil 1 and the battery 3. The chopper 8 changes a drive current of the electric motor 4 flowing through the armature coil 1 according to an operation signal from an operation circuit 9. The operation circuit 9 includes a stabilized power supply 11, a variable resistor 12, an amplifier 13,
It has a transfer device 14, an AND gate 15, a micro switch 16, a limit switch 17, and a NAND gate 18, and has a stabilized power supply.
A variable resistor 12 connected to 11 increases the output in conjunction with the depression of an accelerator pedal (not shown). The amplifier 13 differentially amplifies the deviation between the output of the variable resistor 12 and the output from the current detector 7, and the output of the amplifier 13 is input to the AND gate 15 via the transfer unit 14. The micro switch 16 is turned on when the accelerator pedal is depressed, and the limit switch 17 is attached to, for example, a charger so as to be turned on / off depending on whether or not a charger for charging the battery 3 is connected to an external power supply (both not shown). ing. This charger is mounted on a vehicle. When an outlet of the external power supply is inserted into a connector of the charger for connecting to the external power supply, the battery 3 is charged by the charger and the limit switch 17 is turned off. If the external power supply and the charger are not connected, the output of the NAND gate 18 receiving the signal from the ON limit switch 17 becomes “1”, and
An operation signal corresponding to the operation of the accelerator pedal is output from the gate 15 to the chopper 8, and the chopper 8 controls the drive current of the electric motor 4 based on the operation signal. That is, the chopper 8 and the operation circuit 9 supply a drive current according to the operation of the accelerator pedal from the battery 3 to the electric motor 4,
It has a function as speed control means for controlling the vehicle running speed. When the battery 3 is charged by the external power supply (when the charger and the external power supply are connected), the limit switch 17 is turned off, the output of the NAND gate 18 becomes “0”, and the AND gate 15 Is always "0" and the chopper 8 does not operate. Therefore, at this time, the electric motor 4 stops, and the vehicle cannot travel (so-called traveling interlock operation). That is, the operation circuit 9 also has a function as a charging stop means for detecting the connection state of the external power supply and the charger by the limit switch 17 and cooperating with the speed control means to stop the vehicle when both are connected. In FIG. 3, reference numeral 19 denotes a freewheel diode, and the freewheel diode 19 forms a closed circuit including the armature coil 1 and the field coil 2. 20 is earth.

(Problems to be Solved by the Invention) However, in such a conventional traveling control device for an electric vehicle, the operation circuit 9 as the vehicle stop means during charging is operated and stopped only by turning on / off the limit switch 17. When the driver accidentally depresses the accelerator pedal or unintentionally depresses the accelerator pedal and the connection between the external power source and the charger is released, the operation signal instantly rises. Therefore, there is a problem that the electric motor 4 is rapidly driven and the vehicle oscillates suddenly.

Therefore, the present invention ensures that even if the connection between the external power supply and the charger is released while the accelerator pedal is being depressed, the vehicle stops when charging until the accelerator pedal returns, thereby ensuring that the vehicle starts suddenly. It is intended to prevent it.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a motor for driving a vehicle that uses a battery as a power source, and supplies a drive current corresponding to an operation of an accelerator pedal from the battery to the motor. A speed control means for controlling the running speed of the vehicle, a charger mounted on the vehicle and charging a battery when connected to an external power source, and a connection state between the external power source and the charger for detecting the external power source and the charger. And a charging stop means for stopping the vehicle in cooperation with the speed control means at the time of connection, in the travel control device for an electric vehicle, wherein the charging stop means includes a depression detector for detecting depression of an accelerator pedal. When the external power supply and the charger are disconnected while the accelerator pedal is being depressed, the vehicle is continuously depressed while the accelerator pedal is being depressed based on the output of the depression detector. It is characterized by stopping.

(Operation) In the present invention, the charging stoppage means is provided with a depression detector for detecting depression of the accelerator pedal, and based on the output of the depression detector, connection between the external power supply and the charger is made during depression of the accelerator pedal. Even if it is released, the charging stop means will continue to operate. Therefore, sudden start of the vehicle is reliably prevented.

Hereinafter, the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. This embodiment has an operation circuit different from that of the above-described conventional example.

First, the configuration will be described. In FIG. 1, reference numeral 21 denotes an operation circuit. The operation circuit 21 includes a stabilized power supply 11, a variable resistor 12, an amplifier 13, a transfer unit 14, an AND gate 15, a micro switch 16, a limit switch similar to the above-described conventional example. An AND gate 22 and a memory 23 having a switch 17 and added between the AND gate 15 and the NAND gate 18;
It has a comparator 24 (step-on detector) and a one-shot timer 25 added between 2 and the AND gate 22 and the memory 23. The memory 23 is set when the signal S from the AND gate 22 becomes "1" (the output Q becomes "1"), and is reset when the signal R from the one-shot timer 25 becomes "1" (the output Q becomes low). "0").
The output of the comparator 24 is "0" when an accelerator pedal (not shown) is depressed, and at this time, the signal S output from the AND gate 22 is always "0". The one-shot timer 25 outputs a signal R of “1” for a predetermined time immediately after the input from the comparator 24 changes from “0” to “1”, and returns the accelerator pedal (accelerator OF
F) The memory 23 is reset every time.
Therefore, only when the output of the NAND gate 18 and the output of the comparator 24 become "1", that is, when the external power supply (not shown) is not connected to the charger and the accelerator pedal is not depressed, the data is transferred from the AND gate 22 to the memory 23. Signal S
Becomes "1", the memory 23 is set, and the output Q of the memory 23 becomes "1". Since the set state of the memory 23 is held until the accelerator pedal returns next time and the memory 23 is reset, an operation signal corresponding to the depression angle of the accelerator pedal is transmitted from the AND gate 15 to the chopper 8, and the vehicle The driving current of the electric motor 4 for driving is controlled. That is, the chopper 8 and the operation circuit 21 have a function as a speed control unit that controls the traveling speed of the vehicle by supplying a drive current corresponding to the operation of the accelerator pedal to the electric motor 4. When the external power supply and the charger are connected, the limit switch 17 is turned off, the outputs of the NAND gate 18 and the AND gate 22 are set to "0", and no operation signal is output from the operation circuit 21 to the chopper 8, and the vehicle I can't run. Therefore, the operation circuit 21 detects the connection state of the external power supply and the charger by the limit switch 17, and has a function as a charging stop means for stopping the vehicle by cooperating with the function of the speed control means when both are connected. ing. further,
Even if the connection between the external power supply and the charger is released while the accelerator pedal is depressed, the operation circuit 21 outputs “0” and the signal S becomes “0”, and does not output an operation signal to the chopper 8. Therefore, in this case, the operation circuit 21 continuously stops the electric motor 4 and stops the vehicle in the same manner as when the external power supply and the charger are connected.

 Next, the operation will be described.

In FIG. 2, when the depression of the accelerator pedal is started, the micro switch 16 is turned on and the output of the comparator 24 becomes "0". At this time, an external power supply is connected to the charger of the vehicle in advance, and when the accelerator pedal is depressed, the battery 3 is charged and the limit switch 17 is OFF. Therefore, AND
The output of the gate 22 is always "0", and the motor 4 is stopped because the memory 23 is not set.

Next, in this state, when the connection between the external power supply and the charger is released, the limit switch 17 is turned on but the output of the comparator 24 remains "0" because the accelerator is fully opened, and the AND gate 22 From the memory to the memory 23 becomes "0". Therefore, the AND gate 15 does not output an operation signal to the chopper 8, and the motor 4 stops, so that the vehicle cannot travel.

Next, when the accelerator pedal is returned, the micro switch 16 is turned off and the output of the comparator 24 becomes "1".
And the signal S from the AND gate 22 to the memory 23 is "1"
Becomes Therefore, the memory 23 is set, and the AND gate 15 can output the signal from the transfer unit 14 to the chopper 8. At this time, the output of the comparator 24 changes from “0” to “1” and the signal R of the one-shot timer 25 is output. However, the set signal S from the AND gate 22 to the memory 23 is longer than this output time. Input and the memory 23 will be set as described above.

Next, when the accelerator pedal is depressed again, the deviation between the output of the current detector 7 and the output of the variable resistor
And the output of the amplifier 13 is compared with the comparator
The data is transmitted from the AND gate 15 to the chopper 8 via 24.
That is, the drive current of the electric motor 4 is controlled according to the operation of the accelerator pedal, and the traveling speed of the vehicle is controlled.

As described above, according to the present invention, the operation circuit 21 as a vehicle stop means during charging is operated so that the comparator 24 detects the depression information of the accelerator pedal and prevents the vehicle from suddenly starting when the external power supply and the charger are disconnected. I do.

(Effect) According to the present invention, the stop means for charging is provided with a depression detector for detecting depression of an accelerator pedal, and based on an output of the depression detector, connection of an external power supply and a charger during depression of the accelerator pedal. Even when the vehicle is released, the vehicle stop means for charging continues to operate, so that sudden start of the vehicle can be reliably prevented and safety can be improved.

[Brief description of the drawings]

1 and 2 are diagrams showing an embodiment of a travel control device for an electric vehicle according to the present invention. FIG. 1 is a travel control circuit diagram thereof,
FIG. 2 is a timing chart for explaining the operation, FIGS. 3 and 4 are diagrams showing a conventional example, FIG. 3 is a driving control circuit diagram, and FIG. 4 is a timing chart for explaining the operation. It is a chart. 3 ... battery, 4 ... electric motor, 8 ... chopper (speed control means), 21 ... operation circuit (stop during charging) (speed control means), 24 ... comparator (step-on detector).

Claims (1)

(57) [Claims] An electric motor for driving a vehicle using a battery as a power source, speed control means for supplying a driving current according to an operation of an accelerator pedal from the battery to the electric motor to control a running speed of the vehicle, and mounted on the vehicle. A charger for charging a battery when connected to an external power supply, detecting a connection state of the external power supply and the charger, and stopping the vehicle in cooperation with speed control means when the external power supply and the charger are connected. Stopping means, and a travel control device for an electric vehicle including:
The charging stopping means has a step detector for detecting depression of an accelerator pedal, and when the connection between the external power supply and the charger is released while the accelerator pedal is being depressed, an accelerator is detected based on an output of the depression detector. A travel control device for an electric vehicle, wherein the vehicle is continuously stopped while a pedal is being depressed.