JP2767259B2 - Control circuit of electric door for vehicle - Google Patents

Description

[Detailed Description of the Invention] [Object of the invention] Industrial application field The present invention keeps the door opening and closing speed stable at all times even when the vehicle is inclined, and enables continuous use. The present invention relates to a control circuit for an electric vehicle door that reliably informs a driver of an abnormal stop of a door.

2. Description of the Related Art Conventionally, in a method of controlling the number of rotations of a DC motor of a vehicle door, a simple method such as a dropper method, resistance and diode control can be found, but in such a method, since a calorific value is extremely large, The door cannot be opened and closed continuously, and when the door is opened and closed on a slope, etc., the weight of the door burdens the DC motor, and the opening and closing speed of the door slows down.
However, it also has the disadvantage that flapping occurs.

In addition, in PLL and PWM control, it is necessary to use a rotation speed detection device such as a tachometer or an encoder for the rotation speed of the DC motor, but such a rotation speed detection device is very expensive, so the cost is low. It has the disadvantage of soaring.

Also, if an object is caught in the door or the door is not unlocked, the driver cannot judge what state it is in, so the open / close switch must be operated many times. As a result, a load is placed on the control device, and there is a disadvantage that failure frequently occurs.

Problems to be Solved by the Invention The present invention provides a PWM control circuit with easy feedback means to maintain a constant opening / closing speed of a door in a tilted state of a vehicle and to enable continuous use. The purpose of the present invention is to provide a control circuit for a vehicular electric door in which a driver is reliably notified of an abnormal stop of the vehicle by a warning sound or a warning light.

[Configuration of the invention]

Means for Solving the Problems The present invention has been made in view of the above points, and has been made in view of the foregoing points, and has been made in consideration of a logic circuit, a reversing circuit,
A control circuit for a vehicular electric door having a PWM control circuit and the like, wherein in a bridge circuit in which a first side and a fourth side and a second side and a third side face each other, the first side and the third side The midpoint is connected to the positive electrode of the DC power supply, the midpoint between the second side and the fourth side is connected to the ground, and both terminals of the motor are connected to the midpoint between the first side and the second side and between the third side and the fourth side. And the first, second, third and fourth transistors are respectively arranged on the first side, the second side, the third side and the fourth side to form a bridge circuit of a forward / reverse circuit, Means for applying, via a logic circuit, a base voltage for turning on one of the second and fourth transistors in the forward / reverse circuit in response to the open / close switch; and one of the first and third transistors In order to turn ON, a PWM output is applied to the base of the first or third transistor via a logic circuit. In the control circuit of the vehicular electric door having a PWM control circuit to be applied, a diode is connected to an intermediate point between the first side and the second side and an intermediate point between the third side and the fourth side in order to take out the back electromotive voltage of the motor. A back electromotive voltage output terminal is provided, the back electromotive voltage from the back electromotive voltage output terminal is sampled and held, and the back electromotive voltage is compared with a set voltage input from a logic circuit via a rotation speed setting resistor, A means for feeding back a voltage such that the back electromotive voltage is equal to the set voltage from the PWM control circuit to the logic circuit is provided.A torque limiter circuit for detecting an overcurrent of the motor is provided, and a warning device intermittent circuit is provided in the torque limiter circuit. The above-mentioned drawbacks have to be solved by providing a control circuit for an electric door for a vehicle, characterized in that a warning device having a function of emitting a warning sound or a warning light is connected to the warning device intermittent circuit. Those were.

In the present invention, when the PWM signal supplied to the transistor of the forward / reverse rotation circuit is OFF, the back electromotive voltage generated by the motor is taken out from the back electromotive voltage output terminal via a diode, and the back electromotive voltage is obtained. Input to the sample and hold circuit of the PWM control circuit. The sample and hold circuit samples (samples) the back electromotive voltage of the motor and holds (holds) the voltage until the next PWM signal ON / OFF cycle. Then, a voltage such that the held voltage is equal to the preset voltage is fed back to the logic circuit to make the rotation speed constant.

Also, when the motor is stopped abnormally, the motor is overloaded, and the drive current during normal rotation is reduced.
A remarkably large current flows through the current detection resistor, and an abnormal current is detected by the torque limiter circuit to activate the warning device intermittent circuit to activate the warning device. It signals an abnormal stop.

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a control circuit for a vehicle electric door, and the control circuit 1 includes a logic circuit 2, a forward / reverse rotation circuit 3, a PWM control circuit 4, a torque limiter. It comprises a circuit 5 and a warning device intermittent circuit 6.

The logic circuit 2 is connected to the ignition key 8, the fuse 9, and the open side 11 of the door open / close switch 10 from the positive electrode of the DC power supply 7 via a micro switch 12 and a relay contact 13 to which the door (not shown) is connected except when the door is fully opened. In addition to being connected to the open input terminal 14, it is connected to the closed input terminal 17 via a microswitch 16 that is connected to the closed side 15 of the door open / close switch 10 except when the door is fully closed.

An automatic / manual changeover switch 19 is connected to the lockout output terminal 18 of the logic circuit 2 from the common side of the door open / close switch 10.
A neutral switch 23 connected to the emitter / collector of the transistor 20 via a lockout relay 21 (a relay for conducting a lockout relay contact 63 to be described later) and connected to the ground 22 at the base of the transistor 20
And the parking switch 24 are connected in parallel to each other, and an open prohibition relay 25 is connected between the common side of the relay contact 13 and the base of the transistor 20 to form an open prohibition circuit 26 during traveling.

The bridge circuit of the forward / reverse rotation circuit 3 includes a first side 27a and a fourth side 3
0a, a circuit in which the second side 28a and the third side 39a face each other, and a PNP-type first transistor on the first side 27a.
27, an NPN-type second transistor 28 on a second side 28a, a PNW-type third transistor 29 on a third side 29a, and a fourth side 30a.
NPN-type fourth transistors 30 are arranged respectively.

Then, the first side 27a, the third side 29a and the intermediate point are connected to the fuse 31.
Connected to the positive electrode of the DC power supply 7 through the second side 28
The midpoint between the “a” and the fourth side 30 a is connected to the ground 22 via the current detection resistor 32.

In this embodiment, a transistor is used as a power element. However, the present invention is not limited to such a power element. For example, an FET or the like can be used.

The first side 27a in the bridge circuit of the forward / reverse rotation circuit 3
The two terminals of the door driving motor 36 are connected to the intermediate points of the second side 28a and the third side 29a and the fourth side 30a, respectively.

In addition, diodes 33 and 33a are connected in the forward direction between the first transistor 27 and the second transistor 28 and between the third transistor 29 and the fourth transistor 30,
A diode is connected in series between the intermediate points of the first side 27a and the second side 28a and between the third side 29a and the fourth side 30a, with the polarities reversed.
34, 34a are connected, and a back electromotive force output terminal 35 is formed between the diodes 34, 34a.

Similarly, 37, 37a are diodes connected in series with their polarities reversed between their respective intermediate points, and the diodes 37, 37a constitute an operation confirmation terminal 38 during forward / reverse rotation. .

Reference numeral 39 denotes a braking transistor. The transistor 39 has a base and an emitter connected to the positive line of the DC power supply 7 and a braking transistor 39 connected to the bases of the second and fourth transistors 28 and 30 of the bridge circuit. The collectors are connected to each other, and the brake output terminal 40 of the logic circuit 2 is connected to the base of the transistor 39 for braking.

With such a configuration, in accordance with the brake output from the logic circuit 2, through the operation of the brake transistor 39,
Activate the second and fourth transistors 28, 30 of the bridge circuit to apply voltage to both terminals of the motor 36,
Stop 36.

When the motor 36 is rotating, the motor 36 stops even if one of the two terminals is turned off, but in such a state, the inertia force is present and the motor 36 stops rotating. By simultaneously applying a voltage to both terminals of the motor 36 via the transistor 39, the motor 36 stops instantaneously.

The motor 36 may be stopped in an emergency while the door is being opened or closed, or may be stopped in response to a signal from the torque limiter circuit 5.

41 is a transistor at the time of closing operation.
The reference numeral 41 designates a base-emitter connected to the positive line of the DC power source 7, a closed output terminal 42 of the logic circuit 2 connected to the base of the transistor 41 in the closing operation, and a bridge circuit connecting the collector of the transistor 41 in the closing operation. Connected to the base of the fourth transistor 30, and according to the closed output of the logic circuit 3,
Activating the fourth transistor 30 of the bridge circuit via the activation of the transistor 41 during the closing operation.

In the figure, reference numeral 43 denotes a closed input terminal 17 on the input / output side of the logic circuit 2.
And a closed relay connected between the closed output terminal 42 and the closed relay 43 when a closed signal is input and output to the logic circuit 2.
Is turned on, and the closed relay 43 is a closed relay contact that enables application control to the base of the first transistor 27 of the bridge circuit.
Conduct 57.

44 is a transistor at the time of opening operation,
The reference numeral 44 designates a base and an emitter connected to the positive line of the DC power source 7, an open output terminal 45 of the logic circuit 2 connected to the base of the transistor 44 in the open operation, and a collector connected to the collector of the transistor 44 in the open operation. To the base of the second transistor 28, and according to the open output of the logic circuit 2,
The activation of the transistor 44 during the opening operation activates the second transistor 28 of the bridge circuit.

In the figure, reference numeral 46 denotes an open input terminal 14 on the input / output side of the logic circuit 2.
And an open relay connected between the open output terminal 45 and an open signal when the open signal is input to the logic circuit 2 and output.
Is turned on, and the open relay 46 is connected to an open relay contact for controlling the base of the third transistor 29 of the bridge circuit.
Conduct 55.

Next, the PWM control circuit 4 will be described. The operation confirmation terminal 38 has a transistor ON / OFF confirmation circuit 47.
And connect the confirmation circuit 47 to the sample and hold circuit.
48, and the drive power to the motor 36 is intermittent, i.e., when the drive power is not supplied to the motor 36 by performing PWM control, it is connected to the back electromotive voltage output terminal 35 for taking out the back electromotive voltage of the motor 36. Then, the signal is sampled and held by the sample-and-hold circuit 48, and the signal is fed back to the comparison operation unit 49, and is compared with the signal input from the logic circuit 2 via the rotation speed setting resistor 50 to perform AND operation.
It is connected to the PWM input terminal 52 of the logic circuit 2 via the circuit 51 to form an input.

In the figure, reference numeral 53 denotes a transmitter connected to the AND circuit 51.

Also, the PWM output terminal 54 when the logic circuit 2 is open is connected to the base of the transistor 29 via the open relay contact 55, and the PWM output terminal 56 when the logic circuit 2 is closed is connected to the base of the transistor 27 by the closed relay contact. It is connected via 57.

Incidentally, in the figure, 58 and 58a are ANDs constituting the logic circuit 2.
Circuit.

The torque limiter circuit 5 is located at an intermediate point between the bridge circuit and the ground 22 (in the illustrated embodiment, near the current detection resistor 32).
To detect the drive current of the motor 36,
Function to input an output to the warning device intermittent circuit 6 and to emit a warning sound or a warning light when the abnormal stop of the device, that is, when an excessive current (overcurrent) generated at the time of overload is detected. Is activated for a predetermined time (5 seconds in this embodiment).

In the figure, 60 is a reset circuit, 61 is a constant voltage circuit, 62 is a lockout unit, 63 is a lockout relay contact, 64
Is a micro switch, 65 is a lockout motor, and 66 is a micro switch arranged just before the door closes.

Next, the operation of the control circuit for the vehicle electric door according to the present invention will be described. First, when the door is opened, the ignition key 8 is turned on to switch the door open / close switch 10 to the open side 11, and the neutral switch 23 is turned on. Parking switch 2
4. The open prohibition relay 25 checks whether or not the vehicle is traveling by the traveling open prohibition circuit 26 that prohibits the opening operation of the traveling door, and configures the logic circuit 2 under the condition of stoppage. A warning buzzer (not shown) is sounded by a logic circuit (not shown).

After a predetermined period of time, a lockout signal is output from the lockout output terminal 18 of the logic circuit 2 and the lockout relay 21 is applied. The lockout relay 21 connects the lockout relay contact 63 to the ground 22 and locks. The out motor 65 rotates to operate the lockout unit 62 to release the door lock by the door lock mechanism.

As a general structure of the door lock mechanism, the latch is engaged with the striker to be locked, and the latch automatically reset by the operation of the lockout unit 62 is moved in the unlocking direction (non-engaging direction). To operate.

Thereafter, the transistor 44 at the time of the open operation is operated by the output signal from the open output terminal 45 of the logic circuit 2 to operate the second transistor 28 of the bridge circuit, and the open signal is opened by the output signal from the open output terminal 45. A duty cycle PWM signal is input to the PWM input terminal 52 of the logic circuit 2 by operating the relay 46 to turn on the open relay contact 55 and to set the motor 36 to a predetermined speed by the PWM control circuit 4. At first, the logical operation is performed by the logical circuit 2 and the third transistor 29 of the bridge circuit is operated from the PWM output terminal 54 via the open relay contact 55, so that the second and third transistors 28 and 29 are turned forward. Drive the motor 36 on the road,
Open the door.

In the above state, the PWM supplied to the transistor 29
When the signal is OFF, the back electromotive voltage generated by the motor 36 is extracted from the back electromotive voltage output terminal 35 via the diodes 33a and 34a, and the back electromotive voltage is input to the sample and hold circuit 48 of the PWM control circuit 4. The sample-and-hold circuit 48 samples (samples) the back electromotive voltage of the motor 36, holds the voltage until the next ON / OFF cycle of the PWM signal, and holds the held voltage. Then, a voltage such that the voltage set by the rotation speed setting resistor 50 becomes equal to the logic circuit 2 is fed back to the logic circuit 2 to make the rotation speed constant.

Next, when the door is closed, set the door open / close switch 10 to the closed side 15
And the transistor 41 at the time of the closing operation and the fourth transistor 30 of the bridge circuit are sequentially activated by the output signal from the closed output terminal 42 of the logic circuit 2 and closed by the output signal from the closed output terminal 42. The first transistor 27 of the bridge circuit is activated via the open relay contact 57 by the output signal from the PWM output terminal 56, and the first and fourth transistors are turned on.
The motor 36 is driven by the reverse rotation circuit of 27 and 30, and the door is closed.

When the door reaches the section before closing, the micro switch 16
And the microswitch 66 is operated to supply a high-speed signal to the transistor 27 through a high-speed logic circuit (not shown) built in the logic circuit 2 to operate the motor at high speed. It is.

Next, when the motor 36 stops abnormally, if the door stops due to some influence or a failure occurs in the motor 36, the motor 36 is overloaded, so that the motor 36 is remarkably compared with the drive current during normal rotation. A large abnormal current flows through the current detection resistor 32, and the overcurrent is supplied to the torque limiter circuit 5.
The warning device 59 is activated by operating the warning device intermittent circuit 6 to detect the
Alternatively, the abnormal stop of the motor 36 is notified by a warning light.

In such a state, the brake signal is output from the brake output terminal 40 of the logic circuit 2 to activate the braking transistor 39, and the second and fourth transistors 28 and 30 of the bridge circuit are activated, thereby Stop 36.

〔The invention's effect〕

In short, according to the present invention, the first side 27a and the second side 28a, and the third side 29a and the fourth side 3
A diode 33, 33a, 34, 34a is connected to the midpoint of 0a to provide a back electromotive voltage output terminal 35, and the back electromotive voltage from the counter electromotive voltage output terminal 35 is sampled and held, and the back electromotive voltage and the logic A means is provided for comparing the set voltage input from the circuit 2 via the rotation speed setting resistor 50 and feeding back a voltage such that the back electromotive voltage becomes equal to the set voltage from the PWM control circuit to the logic circuit 2. Supply to transistors 27 and 29
When the PWM signal is OFF, the back electromotive voltage generated by the motor 36 is extracted from the back electromotive voltage output terminal 35 via the diodes 33, 33a, 34, and 34a, and the back electromotive voltage is sampled and held by the PWM control circuit 4. The sample and hold circuit 48 samples (counts) the back electromotive voltage of the motor 36, and uses the voltage as the ON / O of the next PWM signal.
Simple feedback by holding (holding) until the FF cycle, and feeding back a voltage such that the held voltage is equal to the preset voltage to the logic circuit 2 to achieve a constant rotation speed. By simply adding means, the rotation speed of the motor 36 can be kept constant, so that the delay of the opening and closing speed of the door, which has conventionally occurred on slopes, can be eliminated, and the drive power can be PWM controlled and used continuously The cost can be reduced because expensive feedback means such as a tach generator and an encoder are not used, and the reliability can be improved by a simple configuration.

Further, a torque limiter circuit 5 for detecting an overcurrent of the motor 36 is provided, and a warning device intermittent circuit 6 is connected to the torque limiter circuit 5 and a function of emitting a warning sound or a warning light to the warning device intermittent circuit 6 is provided. When the warning device 59 is connected, if the door stops due to some influence or a failure in the motor 36, the motor 36 will be overloaded, resulting in a significantly larger current than the drive current during normal rotation. The abnormal current flows through the current detection resistor 32, and the abnormal current is detected by the torque limiter circuit 5, and the warning device intermittent circuit 6
By operating the warning device 59 to notify the driver of the abnormal stop of the motor 36 by a warning sound or a warning light by operating the warning device 59, the driver can surely know the abnormal stop of the door. In addition to improving safety, the practical effects of greatly improving the reliability, such as reducing the load on the control circuit 1 and the motor 36, and improving the reliability are greatly enhanced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a circuit diagram of a control circuit of a vehicle electric door according to the present invention, FIG. 2 is an operation flowchart when the door is opened, and FIG. It is an operation flowchart at the time. 3 Forward / reverse rotation circuit, 4 PWM control circuit, 5 Torque limiter circuit, 6 Warning device intermittent circuit 7 DC power supply, 10 Door open / close switch 27, 28, 29, 30 Transistor 33, 33a, 34, 34a Diode 35 Back electromotive voltage output terminal, 36 Motor 59 warning device

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-86498 (JP, A) JP-A-58-66591 (JP, A) JP-A-50-110019 (JP, A) JP-A 61-86 151386 (JP, A) Fully open Showa 61-128162 (JP, U) Really open Showa 63-180416 (JP, U)

Claims (1)

(57) [Claims] A control circuit for a vehicle electric door having a logic circuit, a forward / reverse rotation circuit, a PWM control circuit, and the like, wherein a first side and a fourth side and a second side and a third side face each other. In the bridge circuit, an intermediate point between the first side and the third side is connected to the positive electrode of the DC power supply, an intermediate point between the second side and the fourth side is connected to the ground, and the first side, the second side, and the third side are connected. Connect both terminals of the motor to the middle point of the fourth side and the first side, the second
The first, second, third, and fourth transistors are respectively arranged on the sides, the third side, and the fourth side to form a bridge circuit of a forward / reverse circuit. Means for applying, via a logic circuit, a base voltage for turning on one of the second or fourth transistor, and first means for turning on one of the first or third transistor.
Or, PW is connected to the base of the third transistor through a logic circuit.
In a control circuit for a vehicular electric door having a PWM control circuit for applying an M output, a diode is provided at an intermediate point between the first side and the second side and between the third side and the fourth side in order to extract a back electromotive voltage of the motor. Connected to provide a back electromotive voltage output terminal, sample and hold the back electromotive voltage from the back electromotive voltage output terminal, and compare the back electromotive voltage with the set voltage input from the logic circuit via the rotation speed setting resistor. And set the voltage so that the back electromotive voltage is equal to the set voltage.
A means for feeding back from the PWM control circuit to the logic circuit is provided.A torque limiter circuit for detecting an overcurrent of the motor is provided, and a warning device intermittent circuit is connected to the torque limiter circuit. A control circuit for a vehicular electric door to which a warning device having a function of emitting a warning light is connected.