JP3385609B2 - Forward / reverse control circuit for in-vehicle motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a forward / reverse control circuit of a vehicle motor for driving a power window, a sunroof, and the like. 2. Description of the Related Art Conventionally, as a forward / reverse control circuit for an on-vehicle motor for controlling forward / reverse rotation of an on-vehicle motor, Japanese Unexamined Patent Publication No. 7-2224 has been disclosed.
There is an H-bridge motor control circuit disclosed in Japanese Patent Application Publication No. 77-77 and the like. As shown in FIG. 2, the motor control circuit of the H-type bridge comprises four switching elements 50, 52, 54 and 56 each composed of a semiconductor element, which are assembled into an H-type bridge, and these switching elements 50 to 56 are turned on and off. By controlling, the motor 58 is rotated forward and backward, and the rotation speed of the motor 58 is controlled. [0003] By the way, the motor control circuit of the H-type bridge composed of semiconductor elements,
When controlling a high-load motor, such as a motor for driving a power window, it is necessary to use a semiconductor element for a large current capable of flowing a lock current. However, there is a problem that the size of the motor control circuit increases and the cost of the motor control circuit increases. An object of the present invention is to provide an inexpensive and small-sized forward / reverse control circuit for a vehicle-mounted motor. According to a first aspect of the present invention, a forward / reverse control circuit for a vehicle-mounted motor controls forward / reverse rotation of the vehicle-mounted motor. in response, to the in-vehicle motor, a first current supply means for supplying a current for driving the motor in the forward direction, in response to the reverse rotation instruction to the vehicle motor, to the in-vehicle motor, a positive Power for driving in the
Second current supply means for supplying a current in the opposite direction to the current;
It provided downstream of the vehicle motor, and one semiconductor element for controlling the amount of current supplied to the in-vehicle motor by the first current supply means and second current supply means, vehicle motor
A lock state detection means for detecting a lock state of the vehicle-mounted motor from a rotation state of the vehicle, and a relay connected in parallel to the semiconductor element, wherein the relay is provided only when the lock state detection means detects the lock state of the motor. Characterized in that a lock current is supplied to the switch. According to the forward / reverse rotation control circuit for a vehicle-mounted motor according to the first aspect, by controlling the on / off of one semiconductor element provided downstream of the vehicle-mounted motor,
The amount of current supplied to the vehicle motor by the first current supply means or the second current supply means can be controlled. Therefore, the size of the circuit can be reduced, and the cost can be reduced. Further, when the lock state of the motor is detected by the lock state detecting means, a lock current can be supplied to the relay, so that one semiconductor element provided on the downstream side of the vehicle-mounted motor can be used. A low-capacity semiconductor element can be used. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of a forward / reverse control circuit 2 of a vehicle motor for controlling forward / reverse rotation of a motor for driving a power window according to the embodiment. In the forward / reverse control circuit 2 for the vehicle-mounted motor, a current is supplied between the motor 10 and the vehicle-mounted battery 12 to drive the motor 10 in the forward direction, that is, in the direction to raise the power window. And a second relay 16 for supplying a current for driving the motor 10 in the reverse direction of the motor 10, that is, in the direction of lowering the power window. An up switch 18 for instructing opening and closing of a contact of the first relay 14 is connected to a coil constituting the first relay 14.
Is connected to a down switch 20 for instructing opening and closing of a contact point of the second relay 16. A power transistor (power MOS) 22 is provided downstream of the motor 10 and a third relay 24 is connected in parallel with the power transistor 22.
Is provided. The microcomputer 26 controls the power transistor 22 and controls the opening and closing of the contacts of the third relay 24. The motor 10 is provided with a rotation sensor 28, and the output of the rotation sensor is input to the microcomputer 26. In the forward / reverse control circuit 2 of the vehicle motor, when the up switch 18 is turned on to raise the power window, a current flows from the vehicle battery 12 to the coil constituting the first relay 14, The contact of the first relay 14 closes on the side that supplies current to the motor 10. In addition, the microcomputer 26
The power transistor 22 is turned on. As a result, a current for rotating the motor 10 forward is supplied from the vehicle-mounted battery 12 to the motor 10 via the first relay 14, and the power window is raised. When the power transistor 22 is turned on, the microcomputer 26 controls the ratio of the time for turning on the power transistor 22 to the time for turning off the power transistor 22, thereby controlling the amount of current supplied to the motor 10. To control the rising speed of the power window. During the rise of the power window,
When the rotation of the motor 10 is no longer detected by the rotation sensor 28, that is, when it is detected that the motor 10 is locked, the microcomputer 26
When the power transistor 22 is turned off, the third
Is set to a state in which a current flows through the coil constituting the relay 24 of FIG. As a result, the contact point of the third relay 24 is closed, and the lock current of the motor flows to the third relay 24 side. On the other hand, when the down 20 is turned on to lower the power window, the on-board battery 1 is turned on.
Current flows from 2 to the coil constituting the second relay 16, and the contact of the second relay 16 closes to the side that supplies current to the motor 10. The microcomputer 2
6 turns on the power transistor 22. As a result, a current for reversing the motor 10 is supplied from the vehicle-mounted battery 12 to the motor 10 via the second relay 16, and the power window is lowered. In this case as well, the lowering speed of the power window is controlled in the same manner as when the power window is raised. During the lowering of the power window,
When the rotation sensor 28 detects that the motor 10 is locked, the microcomputer 26
Turns off the power transistor 22 and
The current is made to flow through the coil constituting the third relay 24. As a result, the contact point of the third relay 24 is closed, and the lock current of the motor flows to the third relay 24 side. Therefore, according to the forward / reverse control circuit 2 for the on-vehicle motor according to this embodiment, the lock current at the time of motor lock can flow to the third relay 24 side, so that it is supplied to the motor 10. As a power transistor for controlling the amount of current, a low-capacity power transistor can be used. Further, since only one power transistor needs to be used, the forward / reverse control circuit 2
The size and cost of the device can be reduced. Further, the control of the power transistor 22 makes it possible to easily control the rising speed and the falling speed of the power window, thereby creating a sense of quality in the operation of the power window and the like. Thus, control accuracy can be improved. That is, by reducing the rising speed of the window immediately before the window is closed, for example, immediately before the window closes,
Sufficient time for detecting entrapment can be secured, entrapment can be reliably detected, and safety can be improved. In the above-described embodiment, the case where the forward / reverse control circuit of the vehicle motor is used for controlling the motor for driving the power window has been described.
The present invention is not limited to this, and may be used for controlling a motor for driving a sunroof, a power seat, and the like. According to the first aspect of the present invention, one semiconductor element provided on the downstream side of the vehicle-mounted motor is turned on and off.
By controlling the turning off, it is possible to control the amount of current supplied to the vehicle-mounted motor by the first current supply means or the second current supply means. Therefore, the size of the circuit can be reduced, and the cost can be reduced. Further, when the lock state of the motor is detected by the lock state detecting means, a lock current can be supplied to the relay. A semiconductor element can be used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a forward / reverse control circuit of a vehicle-mounted motor according to an embodiment of the present invention. FIG. 2 is a circuit diagram of a conventional forward / reverse control circuit of a vehicle-mounted motor. [Description of Signs] 2 ... Forward / reverse rotation control circuit of vehicle motor, 10 ... Motor, 12
... on-board battery, 14 ... first relay, 16 ... second relay, 18 ... up switch, 20 ... down switch,
22 power transistor, 24 third relay, 26
... microcomputer, 28 ... rotation sensor.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-22224 (JP, A) JP-A 8-126385 (JP, A) JP-A 10-146079 (JP, A) JP-A 8- 251982 (JP, A) JP-A-8-312244 (JP, A) JP-A-4-110246 (JP, A) Japanese Utility Model Application Laid-Open No. 59-44101 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02P 7/00 E05F 15/10

Claims (1)

(57) [Claim 1] In a forward / reverse control circuit of an in-vehicle motor for controlling forward / reverse rotation of an in-vehicle motor, in response to a forward rotation instruction to the in-vehicle motor, a first current supply means for supplying a current for driving the motor in the forward direction, in response to a reverse rotation instruction to the vehicle motor, with respect to the vehicle motor, for driving the forward direction Current and
Is provided downstream of the vehicle-mounted motor, and is supplied to the vehicle-mounted motor by the first current supply unit and the second current supply unit. One semiconductor element for controlling the amount of current to be supplied, a lock state detecting means for detecting a lock state of the vehicle-mounted motor from a rotation state of the vehicle-mounted motor, and a relay connected in parallel to the semiconductor element; A forward / reverse control circuit for a vehicle-mounted motor, wherein a lock current is supplied to the relay only when the locked state of the motor is detected by the locked state detecting means.