JPH01252104A - Contactor controller for motor car - Google Patents

Abstract

PURPOSE:To eliminate response delay of accelerator, by performing optimal switching control of motor control contacts. CONSTITUTION:Upon switching of an accelerator switch 2 from NC side to NO side, a relay 15 functions immediately to switch a relay contact 16 from NC side to NO side thus producing pulses C. Consequently, a flipflop 23 is set. On the other hand, contactors 3, 4 function in about 70mS. A signal (e) rises upon elapse of 70mS after switching of its contact 27 from NC side to NO side. Consequently, the flipflop 23 is reset and a 50mS signal (g) is produced from an OSM circuit 26. Output from a comparator 12 is brought to high level upon elapse of 50mS after low level interval of the signals (e), (g), and a power transistor 11 is conducted upon closure of contactor contacts 5, 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention enables contactor switching to be performed in the shortest possible time by controlling the main circuit output when switching a contactor for controlling a driving pressure motor in an electric vehicle. The present invention relates to a contactor control device for an electric vehicle that enables the following.

[Conventional technology]

FIG. 4 shows a conventional contactor control device. In the conventional example shown in FIG. 4, when the accelerator device (CC3W) 2 in the accelerator device (ΔCC)l is switched from the NC side (regenerative braking state) to the No side (power running state), the contactor (ncl) 3 and (MC2) 4 to switch the contactor contacts (MCI) 5 and (MC2) 6 from the NC side (regenerative braking state) to the No side (powering state B) and connect the DC motor (A) 7 to the main circuit. throw into. In this case, by controlling the soft start circuit (SS) 9 via the output control circuit (OPC) 8, the speed control signal generated by the speed control volume (VR) to is delayed, thereby controlling the chopper. is performed to operate the power transistor (PTR) 11, thereby energizing after the switching operation of the contactor 5.6 is completed. In this way, a soft start method is adopted in which the contactors 5 and 6 are switched with sufficient time, and the rise of the applied current is made gradual.

FIG. 5 is a time chart showing a switching operation from a regenerative braking state to a running state in a conventional contactor control device.

Now, when the accelerator is operated in the accelerator device, the accelerator switch 2 is switched to the No side, the coil voltage of the contactor 3.4 is turned on as shown in b, and the output a of the speed control volume 10 rises. This allows the contactor contacts 5 and 6 to reach 70 m as shown in b'.
After a switching time of 5, the state is switched to the No side (active state). On the other hand, the output control circuit 8 generates an output with a delay time of 0.88 as shown by the signal j and controls the soft start circuit 9, thereby causing the soft start circuit 9 to generate the soft start output shown as a'. arise. A comparator (CP) 12 compares the output a' with the sawtooth wave signal T, and generates a PWM signal whose pulse width increases according to the level of the output a'. The drive amplifier (DA) 13 thereby controls the power transistor 11, and the power transistor 11 is connected to the main drive battery (T,
By performing chopper control to cut off the current from the BAT) 14, the motor 7 generates driving rotational force.

FIG. 6 is a time chart showing a switching operation from a running state to a regenerative braking state in a conventional contactor control device.

In FIG. 6, when the accelerator is operated, the output a of the speed control volume 10 falls, the accelerator switch 2 is switched to the NC side, and the coil voltage of the contactor 3.4 is turned off as shown in b. The output a' of the soft start circuit 9 immediately drops, so that the transistor 11 is not chopper-controlled and no current flows to the motor 7.

In this state, the contactor contact 5.6 is switched to the NC side (regenerative braking state) after a switching time of 150 m5. Further, the output control circuit 8 generates an output shown at j with a delay time of 0.8 seconds. The soft start circuit 9 sets the output a' to a regenerative braking command state in response to the output j, thereby setting the motor 7 to a regenerative braking state via a regenerative braking circuit (not shown).

[Problem to be solved by the invention]

In conventional contactor control devices, it takes 0.8 seconds for the contactor to complete switching and generate the required output, whether switching from the regenerative braking state to the running state or from the running state to the regenerative braking state. I have some free time. As a result, the electric vehicle does not start immediately when the accelerator is depressed, and does not immediately enter a regenerative braking state even when the accelerator is released, resulting in a noticeable delay in accelerator response.

The present invention aims to solve the problems of the conventional technology, and eliminates the delay in accelerator response by optimally controlling the motor control contactor switching, thereby achieving an accelerator feeling similar to that of gasoline-powered automobiles. The purpose of this invention is to prevent the contactor from burning (shelling) by always switching the contactor in a non-energized state.

(Means for Solving the Problems) The contactor control device for an electric vehicle of the present invention has an accelerator switch 2 linked to the accelerator and a speed control volume lO, and when the accelerator switch 2 is operated, the contactor contact 5.6
Turn on and connect the motor 7 to the power supply 14, and
In an electric vehicle in which a motor 7 is driven based on the output voltage of a speed control volume 10, a flip-flop 23 which is set when the accelerator switch 2 is operated and reset when the contactors 5 and 6 are operated, and the operation of the contactor contacts 5 and 6. and a one-shot multi-vibrator 26 that operates for a certain period of time when triggered by a time, and stops driving the motor 7 based on the output voltage of the speed control volume lO when the flip-flop 23 is set and the one-shot multi-vibrator 26 is operated. Configure.

[Embodiment] FIG. 1 shows a circuit configuration of an embodiment of the present invention, and the same parts as in FIG. 4 are indicated by the same numbers.

In FIG. 1, an accelerator device (ACC) 1 is composed of a speed control volume 10 and an accelerator switch (8CC3W) 2, and the movement of the speed control volume 10 and the movement of the accelerator switch 2 are linked. When the accelerator is depressed, the accelerator switch 2 switches from the NC side to the No side, and the contactor (MC1) 3. (MC2) 4 and relay (R'/1) 15 are energized, contactor contact' (gate CI) 5. (MC2) 6° relay contact (RY
1) Both 16 are switched from the NC side to the No side.

A comparator (CP) 12 compares the sawtooth wave signal applied to one gate with the DC output a from the speed control volume lO applied to the + gate, and generates a pulse according to the magnitude of the output a. Generates a PWM signal with varying width. The sawtooth wave signal in this case is a sawtooth wave that starts at about several volts from 0 potential, so that after the accelerator switch 2 is completely turned on, the comparator 1
3 outputs are generated.

The drive amplifier (DA) 13 drives the power transistor (PTR) 1 by the PWM signal from the comparator 12.
Drive 1. The power transistor 11 performs chopper control that changes the average current of the DC motor (A) 7 in accordance with the amount of depression of the accelerator in accordance with the output from the drive amplifier 13.

The main driving battery (T, BAT) 14 is a power source for driving the DC motor 7, and also supplies power to a DC-DC converter (DC-ROCC0NV) 17.

The DC-DC converter 17 stabilizes the voltage of the main driving battery 14 and float-charges the auxiliary battery (AUX BAT) 19. Auxiliary battery 19, contactors 3, 4, relay 15
, general load (Z) 20, and power source B of the DC-DC converter 18. The DC-DC converter 18 supplies power Vcc for the electronic circuit.

IC21 and IC22 are composed of NAND circuits, and include a reset-set (R5) flip-flop (FF) circuit 23.
Configure. IC24 and I'C25 are composed of NAND circuits, and are one-shot multivibrator (03M) circuit 2.
6.

The contactor MCI switch (MCI 5W) 27 is a switch that operates in conjunction with the opening and closing of the contactor contact (MCI) 5.

The relay (RY2) 28 is operated by the output of the DC-DC converter 18, and the relay contact (RY2)
29, the R-3FF circuit 23.
It functions to reset the O5M circuit 26.

In the circuit shown in Fig. 1, when the accelerator is gradually depressed, the contactor contact 5.6 switches from the NC side to the NC side, and then power is applied to the motor 7 via the power transistor 11, but when the accelerator is depressed suddenly When operated, the contactor contacts 5 and 6 are turned on and off while power is being supplied from the power transistor 11, which may cause the contactor contacts 5 and 6 to burn out. In order to prevent such a phenomenon, in the present invention, the output of the comparator 12 is controlled to eliminate such inconvenience. The present invention will be explained in detail below.

FIG. 2 is a time chart showing signals of various parts when switching from the regenerative braking state to the running state in the embodiment of FIG. 1.

If you suddenly step on the accelerator, the accelerator switch 2 will be switched from the NC side to the NC side, the output will immediately change from OFF to ON, and the speed control volume 1 will change from OFF to ON.
The output a of 0 changes from the 0 potential to the power supply voltage Vcc. Relay 15 operates within 1ms and relay contact 16
switches from the NC side to the NC side and generates a short pulse of about 1 ms as shown in C. As a result, the R-3FF circuit 23 is set and the output d becomes low level. At the same time, contactor 3.4 also operates, but its operation requires 70
It may take some time, so contactor MCI switch 27 should be turned to N.
Approximately 70+ by switching from C side to NC side
Output e rises after ns. The transistor 30 has an output e
A short negative pulse f is generated by applying a weak pulse of 2 to the input, and this resets the R-3FF circuit 23, so that the output d returns to a high level. At the same time, the O3M circuit 26 is triggered by the pulse r and generates a low level pulse of approximately 50m5 at the output g.

Therefore, the output level of the comparator 12 is kept at a low level until the output d and the output g are at a low level, that is, until approximately 50 m5 have passed after the end of the operation of the contactor 3.4. , 6 are opened, energization is started with a certain margin of time, and burnout of the contactor contacts 5.6 is prevented. O3M circuit 2 that determines the margin time in this case
The pulse width of 6 may be set to, for example, about 50 m5 as described above, taking into account the bounce time of the contactor contact 5.6.

FIG. 3 is a time chart showing signals of various parts when switching from the running state to the regenerative braking state in the embodiment of FIG. 1.

If the accelerator is suddenly released from the currently depressed state, the output a of the speed control volume 10 will immediately return from the power supply voltage Vcc to 0 potential, and due to the structure, the accelerator switch 2 will be switched from the NC side to the NC side with a slight delay. The output is turned off. As a result, relay 1'5 is 301s
The relay contact 16 switches from the NC side to the NC side and generates a short pulse of about 3 ms as shown in C.

As a result, the R3-FF circuit 23 is set and the output d becomes low level. At the same time, the contactors 3 and 4 are restored, but since it takes about 150 m5 to restore them, the photocoupler 31 is operated by switching the contactor contact 6 from the NC side to the NC side, and the output rises after about 150 m5. The transistor 32 generates a short negative pulse r by receiving a weak pulse at the output, and this resets the R3-FF circuit 23, so that the output d returns to a high level. At the same time, the O3M circuit 26 is triggered by the pulse ``, and generates a low level pulse of about 50m5O at the output g.

Therefore, in this case as well, the output level of the comparator 12 is the period when the output d and the output g are at low level, that is, the output level of the contactor 3
.
It is kept in the off state, thus preventing burnout of the contactor contacts 5.6.

As described above, according to the contactor control device of the present invention, there is no need to consider fluctuations in the operating time of the contactors 3 and 4, and there is no need to consider the fluctuation of the contactor coil.

It is possible to provide the minimum margin time required for contactor switching without being affected by fluctuations in the auxiliary power supply voltage that operates the contactor, regardless of heating.

〔effect〕

As explained above, according to the present invention, the drive input to the motor drive transistor is applied regardless of variations in the operating time of the contactor, regardless of fluctuations in the contactor coil voltage, and regardless of heating and cooling of the contactor. You can decide the best time to give. Therefore, it is not necessary to provide an unnecessarily long margin time before applying driving force to the motor drive transistor, which is extremely effective for improving the accelerator feeling.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the circuit configuration of an embodiment of the present invention, Fig. 2 is a time chart showing the signals of each part when switching from the regenerative braking state to the moving state, and Fig. 3 is the regenerative braking from the moving state to the moving state. Fig. 4 is a diagram showing a conventional contactor control device, Fig. 5 is a time chart showing signals of each part when switching to the state
The figure is a time chart showing the switching operation from the regenerative braking state to the running state in a conventional contactor control device, and FIG. 6 is a time chart showing the switching operation from the running state to the regenerative braking state in the conventional contactor control device. be. .゛ 1...Accelerator ff (ACC), 2...
Accelerator switch (ACCS), 3.4... Contactor, 5.6... Contactor contact, 7... DC motor (A), 10... Speed control volume (VR), 11
... Power transistor (PTR), 12... Comparator (CP), 13... Drive amplifier (DA)
, 14... Main power source for driving (T, BAT), 15.
28...Relay, 16...Relay contact, 17.18
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Claims (1)

[Claims] (1) It has an accelerator switch 2 linked to the accelerator and a speed control volume 10, and when the accelerator switch 2 is operated, contactors 5 and 6 are turned on to connect the motor 7 to the power source 14, and the speed control In an electric vehicle that drives a motor 7 based on the output voltage of a regulator 10, a flip-flop 23 is set when the accelerator switch 2 is operated and reset when the contactors 5 and 6 are operated; and a one-shot multivibrator 26 that operates for a certain period of time when triggered, and stops driving the motor 7 based on the output voltage of the speed control volume 10 when the flip-flop 23 is set and the one-shot multivibrator 26 is operated. A contactor control device for electric vehicles featuring: