JPS6080978A - Steering control device for car - Google Patents

Abstract

PURPOSE:To facilitate steering at start by providing the stop decision means of a motor, steering position decision means, and setting means that sets the preset position of a steering mechanism and setting the steering mechanism to the preset position at start. CONSTITUTION:A potentiometer 1 is provided as a steering position decision means generating signal voltage that indicates the direction of a steering wheel and a keyswitch 2 is provided as the stop decision means of a motor. When the keyswitch 2 is ON, the output signals of the potentiometer 1 are compared with two reference values in a wind comparator 4 within a control circuit 3. The reference values of the comparator 4 can be set to the upper and lower bound reference values by adjusting a shunt resistor 4. In accordance with the result of the comparison in the comparator 4, a motor 8 is controlled through a driving circuit and a steering mechanism is rotated reversibly. On the other hand, when the keyswitch 2 is OFF, the steering mechanism is rotated up to the neutral position and is awaited at this position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a steering control device for an automobile that adjusts the position of a steering mechanism to a predetermined position when the vehicle is stopped.

(1) (Background) When getting into a car and trying to start it, the driver may be confused about the steering operation because the direction in which the car is traveling is unknown.

(Objective of the invention) To facilitate steering operation at the time of starting by setting the steering mechanism at a predetermined position at the time of starting.

(Structure of the Invention) Discrimination means for determining whether the vehicle prime mover has stopped, second discrimination means for discriminating the position of the steering mechanism, setting means for setting a predetermined position of the steering mechanism, and discrimination between the two discrimination means. and signal generating means for generating a control signal in response to the result and the set position of the setting means until the steering mechanism moves to a predetermined position when the vehicle prime mover is stopped.

Here, the setting means serves as a reference for moving the steering mechanism to a preset position, and for example, it may be fixed in advance using the neutral position of the steering mechanism as the reference (2), or it may be a manual operating device. etc., it may be possible to set an arbitrary position.

(Embodiment) In the figure, reference numeral 1 denotes a potentiometer as a second determining means for determining the position of the steering mechanism, which works in conjunction with the steering wheel etc. to generate a signal voltage representing the direction of the steered wheel. Key switch 2 is opened to stop the vehicle prime mover. The control circuit 3 changes the signal voltage of the potentiometer 1 to 2.
It includes a known window comparator 4 for comparison with one reference value.

Window comparator 4 outputs logic 1 via logic gate 5.
When the signal voltage of potentiometer 1 is greater than the upper limit reference value, the line 4A becomes an H signal, the lower limit reference value (<upper limit reference value). When it is smaller, II 48 becomes an H signal. In the window comparator 4, the upper and lower reference limits can be set to position values by adjusting the voltage dividing resistors 4C, as is well known, and these values correspond to, for example, the neutral position of the steering mechanism.

(3) The output lines 4A and 4B of the window comparator 4 are connected to the motor drive circuit 7. A known motor drive circuit 7 is connected to a DC drive motor 8, and reversibly energizes the motor 8 in response to signals on lines 4A and 413, causing it to rotate reversibly.

The motor 8 is connected to a steering mechanism via a speed reduction mechanism and a one-way transmission clutch (not shown), and as the motor 8 reversibly rotates, the steering mechanism is reversibly rotated.

However, the rotation of the steering mechanism is not transmitted to the motor 8.

The device configured as described above does not operate while the key switch 2 is closed. When the key switch 2 is opened, the window comparator 4 determines whether the position of the steering mechanism deviates from a predetermined position determined as a reference value by the voltage dividing resistor 4C, and depending on the determination result, the window comparator 4 detects a line 4A or 4B.
generates a control signal. These control signals 4A and 4B are applied to the motor drive circuit 7 to rotate the motor 8 in either direction, and when the position of the steering mechanism belongs to the reference value region, both output lines 4A and 4B of the window comparator 4 (4) are applied. This continues until the control signal becomes an L signal. When both control signals become L signals, the motor 8 stops rotating and the device enters a standby state.

In the above configuration, instead of the potentiometer 1 and the window comparator 4, a switch mechanism generates an H signal to the cotton 4A or 4B when the circuit is disconnected at a predetermined position of the steering mechanism, such as the neutral position, and the steering mechanism is removed from that position. may be adopted. The switch mechanism includes one movable contact that interlocks with the steering mechanism, and two fixed contacts provided on both sides within the moving range of the movable contact, excluding the neutral range, and each of the fixed contacts are connected to the lines 4A and 4B, and a switch that closes when the key switch 2 is opened is connected in series to the movable setting. In this case, the non-conducting area between the two fixed contacts corresponds to the setting means according to the present invention, and the movable contact corresponds to the position determining means of the steering mechanism.

[Brief explanation of the drawing]

The attached drawing is an electrical wiring diagram (5) showing an embodiment of the present invention. 1... Potentiometer (second determining means), 2...
・Key switch (discrimination means), 4... Window comparator (signal generation means), 4C... Voltage dividing resistor (setting means), 7... Motor drive circuit (drive means), 8...
Motor (drive means). Representative Patent Attorney Takashi Okabe (6)

Claims (1)

[Scope of Claims] Discrimination means for determining whether the vehicle prime mover has stopped; second determination means for determining the position of the steering mechanism; setting means for setting a predetermined position of the steering mechanism; a signal generating means for generating a control signal until the steering mechanism moves to a predetermined position when the vehicle prime mover is stopped in response to the determination result and the setting position of the setting means; A steering control device for an automobile, comprising: a drive means for driving;