JPH06293237A - Door mirror control device for automobile - Google Patents

Abstract

PURPOSE:To decrease a number of part items used in an electric circuit of a control part and further simplified while connecting the control part to a driving part by a small number of harnesses. CONSTITUTION:A driving part 1 is connected to a control part 3 by two harnesses (h), to connect forward/reverse directional current circuits 5a, 5b in parallel and also connected in series to the harness (h) with a motor M. The control part 3 used with a microcomputer for detecting an opening/closing condition of the forward or reverse directional current circuit 5a or 5b through the harness (h), judging a door mirror position and turning the motor M by this judging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle door mirror control device for operating a vehicle door mirror with a storage priority.

[0002]

2. Description of the Related Art Conventionally, a door mirror for an automobile uses a foldable door mirror which can take a returning position (position for use) which greatly extends laterally from a vehicle body in order to secure a field of view during traveling. . When moving a car equipped with this retractable door mirror into and out of the garage, or when the width of the car is adjusted, the door mirror is swung from the return position to the side of the vehicle body, which is the storage position, to the side of the door mirror. The amount of overhang is being reduced.

FIG. 3 is a block diagram of a conventional door mirror control device, in which the left and right drive units 40 are used.
Are the four harnesses wired inside the thin spindle 42 of the door mirror.
It is guided to the main body of the automobile by the nest and is connected to the control unit 41 via the connector-c of the connector unit 43.

A switch 3 provided on the left and right drive units 40
Reference numerals 2 and 33 denote a storage position detection switch and a return position detection switch, respectively. The storage position detection switch 32 (hereinafter referred to as the storage switch) is OFF, and the return position detection switch 33 (hereinafter referred to as the return switch) is ON. When the door mirror is in the storage position, the storage switch 32 is ON, and the return switch 33 is OFF, the door mirror is in the return position. In addition, in cases other than the above, it means that the door mirror is in an indefinite position that is not located at either the storage position or the return position, and occurs when the door mirror comes into contact with an obstacle or the like and causes a positional shift. Therefore, the current position of the door mirror can be known by examining the open / closed state of these position detection switches.

If the door mirror is inadvertently rotated, the door mirror may collide with an obstacle or the like. Therefore, a door mirror with a storage priority specification has been proposed. When the operation switch (switch for instructing the rotation of the door mirror) is input, the control unit configured to the storage priority specification preferentially positions the door mirror at the storage position for initial setting.

[0006]

However, the above-mentioned control device requires a control section having a complicated electronic circuit, which causes a cost increase. FIG. 4 is Japanese Patent Laid-Open No. 2-
In the control device for a door mirror disclosed in 179553, when the operation switch is pressed, the control unit causes the storage switch 3
2, the open / close state of the return switch 33, that is, the position of the door mirror is detected to rotate the door mirror.

Further, when the four harnesses are wired from the drive unit to the main body of the vehicle, the harness is installed in the support shaft 42 of the thin door mirror.
Necessity is required to be wired, which deteriorates workability and requires four connectors-c for connecting the harness on each of the left and right sides, which is a factor of cost increase.

Therefore, an object of the present invention is to provide an inexpensive door mirror device for an automobile by improving the workability by reducing the number of harnesses and by using a control unit having a simple electronic circuit.

[0009]

In order to achieve the above object, the present invention rotates a door mirror in which a drive unit can take a predetermined position between a use position and a storage position and a non-predetermined position other than the predetermined position. A motor and a position detection switch circuit that opens and closes when the door mirror is located at a predetermined position, and the control unit detects the open / closed state of the position detection switch circuit and drives the motor to move the position of the door mirror. In the mirror control device for an automobile controlling the above, the drive unit and the control unit are connected by two harnesses, and the position detection switch circuit and the motor are connected in series to the harness.

Then, a storage signal is output to the position detecting switch circuit for a predetermined period of time via the harness to the control unit, and when the storage signal flows to the position detecting switch circuit, the door mirror is moved to a position other than the storage position. If it is determined that the door mirror is in the storage position, the motor is rotated to position the door mirror, and if the storage signal does not flow, it is determined that the door mirror is in the storage position and the door mirror is set to the use position. A determination circuit for rotating the motor to position the motor is provided.

[0011]

According to the above construction, the control unit and the drive unit are connected by two harnesses, which are used to drive the motor and detect the open / closed state of the position detection switch circuit.

Then, the microcomputer provided in the control unit determines the open / closed state of the position detection switch circuit, that is, the position of the door mirror, and based on this determination, controls the door mirror with storage priority.

[0013]

Embodiments of the present invention will be described with reference to the drawings. Figure 1
2 is an electric circuit diagram of a vehicle door mirror control device (hereinafter, simply referred to as a control device). The control device has a drive unit 1, a control unit 3, and an operation switch 10 which are arranged in the door mirror.

The drive unit 1 is composed of drive units 1a and 1b for driving the left and right door mirrors, and each has two harnesses h.
Connected by. Reference numeral c denotes a connector, which is used to connect the control unit provided in the automobile body and the drive unit provided in the automobile door mirror when the device is assembled. Further, the drive units 1a and 1b are diode D
1 and a storage switch 4a, a forward current circuit 5a
It has a (position detection switch circuit) and a reverse current circuit 5b (position detection switch circuit) including a diode D2 and a return switch 4b, which are connected in parallel and connected in series with the motor M. When the door mirror is located at the storage position, the storage switch 4a turns off.
When it becomes F, the forward current circuit 5a is cut off, and the return switch 4b is turned on, and the reverse current circuit 5b is configured as a closed circuit. If the door mirror is in the return position,
The storage switch 4a is turned on to close the forward current circuit 5a, and the return switch 4b is turned off to shut off the reverse current circuit 5b.

The control section 3 has a relay drive circuit 6, a motor current detection circuit 7, a judgment circuit 8 and a power supply circuit 9.

The relay drive circuit 6 includes a storage drive circuit including a relay Ry1 and a transistor Q1 and a relay Ry2.
And a transistor Q2, and the motor current detection circuit 7 has a reference voltage generation circuit composed of a motor current detection resistor R1 and resistors R2, R3, and C1. It is input to the terminal and + terminal. The presence / absence of the motor current is determined by the motor current detection circuit 7 with a threshold value of about 100 mA, and is normally set to detect a motor current of about 300 mA to 1 A.

The determination circuit 8 has a microcomputer IC2, a closing signal for turning on the operation switch 10 is input to the terminal P1, and a motor current presence / absence signal is input to the terminal P2. Based on these signals. A drive signal is output from the terminals P4 and P5 to the relay drive circuit 6.

Next, the circuit operation in the above configuration will be described. When a drive signal is output from the terminal P4 to the transistor Q1 of the relay drive circuit 6, the transistor Q1 becomes conductive and the relay Ry1 operates. Therefore, the relay contact 11 is NC
From NO to NO. At this time, the potential at the point A is the battery voltage (connected to the IG), and the potential at the point B has the ground potential via the motor current detection resistor R1, so that the motor current tries to flow in the direction of the arrow IF. To do.

In this state, when the door mirror is located at a position other than the storage position, that is, when the storage switch 4a is ON,
The motor current (stored signal) flows through the forward current circuit 5a. Therefore, a current flows in the motor current detection resistor R1 and a voltage is generated in the motor current detection resistor R1. This voltage is applied to the negative terminal of the comparator IC1, and the comparator I
A signal is output from C1 to the terminal P2.

When the door mirror is located at the storage position, that is, when the storage switch 4a is OFF and the return switch 4b is ON, the reverse current circuit 5b is provided.
Although a closed circuit is formed through the circuit, the motor current does not flow because of the diode D2, and the current does not flow through the motor current detection resistor R1. Therefore, from the comparator IC1 to the terminal P2
No signal is output to.

On the other hand, the transistor Q of the relay drive circuit 6
When a drive signal is output to the terminal 2 from the terminal P5, the transistor Q2 becomes conductive and the relay Ry2 operates. Therefore, the relay contact 12 is connected from NC to NO, and the motor current tends to flow in the direction of the arrow IR.

In this state, when the door mirror is located at a position other than the return position, that is, when the return switch 4b is ON,
The motor current comes to flow through the reverse current circuit 5b.
Therefore, a current flows through the motor current detection resistor R1 to generate a voltage at the motor current detection resistor R1, and a signal is output from the comparator IC1 to the terminal P2.

When the door mirror is in the return position, that is, when the return switch 4b is OFF and the storage switch 4a is ON, the forward current circuit 5a is present.
Although a closed circuit is formed through the circuit, the motor current does not flow because of the diode D1 and the current does not flow through the motor current detection resistor R1. Therefore, from the comparator IC1 to the terminal P2
No signal is output to.

To summarize the above operation, output from the terminal P4, a position other than the storage position → terminal P
Input to 2 is output from terminal P4, storage position → terminal P
No input to 2 Output from terminal P5, position other than return position → terminal P
Input to 2 is output from terminal P5, return position → terminal P
No input to 2 The microcomputer IC2 controls the motor current based on the above result. FIG. 2 is a flowchart showing the operation of the microcomputer IC2, and the operation will be described with reference to FIG.

The microcomputer IC2 starts at step 0 and determines at step S1 whether or not the door mirror storing / restoring operation is being performed. If the storing / restoring operation has not been performed, the process proceeds to step 2, and in step S2, it is determined whether the operation switch 10 is waiting for input. If the operation switch 10 is not pressed, the process returns to step 1, and if the operation switch 10 is pressed, the process proceeds to step 3. In step 3, power is supplied in the storage direction, and it is determined in step 4 whether or not a predetermined time has elapsed since the start of power distribution. This predetermined time is the time required for the relays Ry1, Ry2, etc. to reach a steady state when a signal is output from the microcomputer IC2, and is 10 to 10.
It is set to 0 msec. Further, the energization in the storage direction in step 3 is for performing the storage priority operation. That is, if the door mirror is located at a position other than the storage position, the electric power is supplied so that the door mirror always comes to the storage position. After that, the process proceeds to step 5 to check the motor current.
At this time, since the motor M is energized in the storage direction in step 3, if the motor current is not detected, it means that the door mirror is in the storage position, and step 6
Is energized in the return direction. On the other hand, if the motor current is detected, the door mirror is not yet in the storage position, so the process proceeds to step 7 to continue the storage operation, and then step 1
The motor current is confirmed again in step 8 via. If the storing operation is not completed in step 8, the process proceeds to step 9 and it is determined whether or not a predetermined time (16 seconds) has elapsed since the operation switch 10 was pressed. When the predetermined time has elapsed, it is determined that the storage switch provided in the door mirror has an abnormality for some reason and the current continues to flow, and the process proceeds to step 10 to stop the storage and return operations, and the predetermined time is passed. If it is within the range, it goes to the loop for returning to step 1. Therefore, if there is no abnormality in the storage switch, the door mirror comes to be in the storage position and the operation proceeds from step 8 to step 10 to stop the operation.

As described above, according to the present invention, it is possible to manufacture a door mirror control device which gives priority to storage with a small number of parts. Further, the number of harnesses h to be wired to the door mirrors is two each on the left and right, which improves the workability when wiring the inside of the support portion of the thin door mirror and reduces the number of connectors to reduce the cost.

[0027]

According to the present invention, the drive section and the control section are combined into two.
Since it is connected by the harness of the book, it is possible to reduce the number of connectors used, and by using a microcomputer for the control unit, the electric circuit is simplified and the number of parts is reduced, improving workability and It has become possible to reduce costs.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a vehicle door mirror control device of the present invention.

FIG. 2 is a flowchart of a program used for the microcomputer IC2 of FIG.

FIG. 3 is a block diagram of a conventional vehicle door mirror control device.

FIG. 4 is a circuit diagram of a conventional vehicle door mirror control device.

[Explanation of symbols]

 1 Drive part 3 Control part 5a Forward direction current circuit (position detection switch circuit) 5b Reverse direction current circuit (position detection switch circuit) IC2 Microcomputer h Harness M Motor

Claims (1)

[Claims] 1. A drive having a motor for rotating a door mirror that can take a predetermined position between a use position and a storage position and a non-predetermined position, and a position detection switch circuit that opens and closes when the door mirror is at the predetermined position. In a mirror control device for an automobile, the control unit drives a motor by detecting an open / closed state of the position detection switch circuit, wherein the drive unit and the control unit are connected by two harnesses. At the same time, the position detection switch circuit and the motor are serially connected to the harness, and the control unit outputs a storage signal to the position detection switch circuit for a predetermined time through the harness. However, when the storage signal flows to the position detection switch circuit, it is determined that the door mirror is not in the storage position and the door mirror is moved to the storage position. Therefore, it has a judgment circuit for rotating the motor and judging that the door mirror is in the storage position when the storage signal does not flow, and rotating the motor to position the door mirror in the use position. A door mirror control device for automobiles characterized by the following.