JP2583302Y2 - Constant-speed traveling device for vehicles - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant speed traveling device for a vehicle, and more particularly, to a control circuit which performs arithmetic control so as to maintain a vehicle speed at a set vehicle speed and outputs a drive control signal to an actuator which performs a vehicle speed control operation. On the other hand, the present invention relates to a constant speed traveling device for a vehicle which selectively supplies a power supply voltage via a main switch.

[0002]

2. Description of the Related Art In general, various constant-speed traveling devices for maintaining the speed of a vehicle at a predetermined set speed are known.
According to such a constant speed traveling device, by operating the accelerator pedal and operating the set switch when a desired vehicle speed is reached, the actuator that operates in the same manner as the accelerator pedal operates, and thereafter the accelerator pedal is operated. The vehicle speed can be maintained at the set speed even if the foot is released.

[0003] Among the above-mentioned constant-speed traveling devices, there is a device using a motor-type actuator. For example, there is a device in which an operating member connected to an accelerator pedal of the actuator is driven by a motor via a magnet clutch. In such a device, when performing the constant speed traveling control, the clutch drive circuit is turned on to connect the clutch, and the operating member of the actuator is drive-controlled by the motor. Further, when stopping the constant speed traveling control, for example, when the main switch is turned off, the power supply voltage is not supplied to the control unit, so that the motor drive circuit and the clutch drive circuit are turned off, and the actuator is not operated. Can be

[0004]

[Problem to be solved by the invention] The main purpose of the invention is to
It is an object of the present invention to provide a control circuit of a constant speed traveling device for a vehicle, which can return a motor to an initial position when a main switch is turned off.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a control circuit for performing arithmetic control so as to maintain a vehicle speed at a set vehicle speed and generating a control signal; into a main switch provided, and the acceleration and deceleration drive circuit for driving an actuator for performing speed control operation based on the control signal, the main switch
An auxiliary deceleration drive circuit for driving the actuator to a deceleration side when the control circuit side voltage decreases ,
The primary reduction driving circuit, said and said main switch provided between the main switch and the control circuit
A power supply circuit capable of supplying a voltage that gradually decreases with a time constant of the circuit even when the control circuit side voltage decreases, a voltage detection circuit for detecting a decrease in the supply voltage of the power supply circuit, and the voltage detection circuit The power supply and the node of the main switch are provided between the deceleration drive circuit to output a deceleration drive control signal separate from the control circuit to the deceleration drive circuit when the voltage drop detection signal is generated. The present invention is attained by providing a vehicle constant-speed traveling device having a deceleration signal generation circuit. A control circuit that performs arithmetic control to maintain the vehicle speed at a set vehicle speed and generates a control signal; a main switch provided between a power supply and the control circuit; and an actuator that performs a vehicle speed control operation based on the control signal. And an acceleration / deceleration drive circuit for driving the main switch and the control circuit side voltage of the main switch are reduced.
And a primary reduction driving circuit for the actuator upon driving to the deceleration side, the primary reduction driving circuit,
When the main switch is turned on, the acceleration / deceleration drive circuit is connected to the actuator, and when the control circuit side voltage of the main switch is reduced , the voltage for driving the actuator to the deceleration side is set to the voltage. This is attained by providing a constant-speed traveling device for a vehicle, comprising a relay circuit provided between the power supply and the node of the main switch and the actuator so as to directly supply the actuator.

[0006]

In this way, the control circuit of the main switch
Power supply voltage supplied to the control circuit due to contact failure of the side contact
If the speed drops, an auxiliary deceleration drive circuit separate from the control circuit
Outputs a deceleration signal to the motor and drives the actuator to the deceleration side.
Drive, so even if the main switch contacts are faulty,
Return to the initial position,
Signal or noise enters the control circuit and the control circuit malfunctions
Even if the main switch is turned off, the control circuit and
Another auxiliary deceleration drive circuit outputs a deceleration signal to the motor
Since the actuator is driven to the deceleration side, the control circuit
The actuator can be returned to the initial position even when operated . A relay circuit is provided between the acceleration and deceleration drive circuit and the actuator, and a control circuit for the main switch is provided.
By directly supplying the power supply voltage to the actuator via the relay circuit that has been switched due to the voltage drop on the side , the motor can be similarly driven to the reduction side.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a circuit diagram showing a schematic configuration of a vehicle constant-speed traveling device according to the present invention. The voltage of a battery 2 as a power supply is supplied to an ignition switch 3,
The fuse 4 and the main switch 5 are supplied in this order, and the node between the main switch 5 and the terminal a is connected to the other end of the main lamp 6 whose one end is grounded. A vehicle speed sensor 7 is connected to a terminal b of the control unit 1, and an ignition sensor 8 is connected to a terminal c. One end of the set switch 9 is connected to the terminal d, and one end of the resume switch 10 is connected to the terminal e.
10 is connected to the battery 2 via a common fuse 11a.
It is connected to the.

One terminal of a normally open contact S1 and one end of a normally closed contact S2 of a brake switch 12, which is linked to a brake pedal (not shown), are connected to terminals f and g of the control unit 1, respectively. The other end of the contact S1 is connected to the node of the battery 2 and the ignition switch 3 via the fuse 11b, and the other end of the contact S2 is connected to the node of the main switch 5 and the terminal a.
One end of a clutch switch 13 which is a normally closed contact and opens in conjunction with a clutch pedal (not shown) is connected to a terminal h of the control unit 1, and the other end of the clutch switch 13 is grounded. The other end of the brake lamp 14 whose one end is grounded is connected to the node of the normally open contact S1 and the terminal f of the brake switch 12.

[0010] The actuator 15 of the present constant speed traveling device is
An operation member (not shown) is selectively connected to an output shaft of a motor 16 which is a motor drive type and is rotatable forward and backward via a magnet clutch 17. The pedal is connected. The coil 17a of this magnet clutch 17
Is connected to a ground, and the other end is connected to a clutch output terminal i of the control unit 1.

Further, both terminals of the motor 16 are connected to the motor output terminals j and k of the control unit 1, respectively. When a current flows from the terminal j to the terminal k, the motor 16 rotates to the acceleration side. When a current flows from the terminal k to the terminal j, the motor 16 rotates to the deceleration side. A lower limit switch 18 is connected between the terminal j and one terminal of the motor 16, and a diode D1 capable of passing a current to the terminal j by bypassing the lower limit switch 18 is connected to a lower limit switch. It is provided in parallel with the switch 18. Similarly, an upper limit switch 19 is connected between the terminal k and the other terminal of the motor 16, and a diode D2 capable of bypassing the upper limit switch 19 and allowing a current to flow toward the terminal k is connected to the upper limit switch. It is provided in parallel with the limit switch 19.

Next, the circuit configuration in the control unit 1 will be described below. A power supply terminal a has a power supply circuit 2 as a constant voltage power supply for each circuit in the control unit 1.
1 is connected, a power supply terminal V of the CPU 22 as a control circuit is connected via the power supply circuit 21, and a reset terminal R of the CPU 22 is connected via the reset circuit 23. The signal input terminals I1 to I4 of the CPU 22 are connected to the terminal b via the input / output circuit 24.
To e are connected, and the other signal input terminals I5 to I7
Are also connected to the terminals f to h via the input / output circuit 25. The clutch output terminal O1 of the CPU 22 is connected to the terminal i via the clutch drive circuit 26.

An acceleration signal output terminal O2 of the CPU 22 is connected to one input terminal of a two-input one-output acceleration-side AND circuit 27 as an acceleration drive circuit, and the output terminal of the acceleration-side AND circuit 27 is connected to a terminal. j. C
The deceleration signal output terminal O3 of the PU 22 is connected to one input terminal of a two-input one-output type OR circuit 28, and the output terminal of the OR circuit 28 is a two-input one-output type deceleration as a deceleration drive circuit. It is connected to one input terminal of an AND circuit 29. Further, an acceleration signal output terminal O of the CPU 22 is provided.
2 is connected via a knot circuit 31 to the other input terminal of the deceleration-side AND circuit 29, and the output terminal of the OR circuit 28 is connected via a knot circuit 30 to the acceleration-side AND circuit 27.
Is connected to the other input terminal.

A voltage detection circuit 32 for detecting a decrease in the supply voltage of the power supply circuit 21 is connected to a node between the power supply circuit 21 and the CPU 22, and an output terminal of the voltage detection circuit 32 is decelerated. The signal generation circuit 33 is connected. The output terminal of the deceleration signal generating circuit 33 is connected to the other input terminal of the OR circuit 28. When the main switch 5 is turned off and the power supply is turned off, the supply voltage of the power supply circuit 21 decreases. However, the voltage detection circuit 32 detects that the supply voltage has fallen below a predetermined value.
, A drive signal is output from the voltage detection circuit 32 to the deceleration signal generation circuit 33. In this way, when the main switch 5 is turned off, the state is changed via the voltage detection circuit 32 and the deceleration signal generation circuit 33 to the OR circuit 28 and the respective knot circuits 30.
An auxiliary deceleration driving circuit capable of outputting a signal to the acceleration and deceleration side AND circuits 27 and 29 is constituted by 31.

In the device configured as described above, when the ignition switch 3 is turned on and the main switch 5 is turned on, power is supplied to the control unit 1 and the main lamp 6 is displayed to indicate the state. Lights up. When the set switch 9 is turned on during running, the vehicle speed at that time is set based on the vehicle speed signal from the vehicle speed sensor 7 under the condition that the cancel signal such as the brake switch 12 and the clutch switch 13 is not input. And the constant-speed running control is performed. In this constant-speed running control, since the accelerator pedal is driven by the motor 16, a clutch connection signal is output from the terminal i to bring the magnet clutch 17 into the connected state, and the coil of the magnet clutch 17 is excited.

If a difference between the set vehicle speed and the actual vehicle speed exceeds a permissible value due to a load change during traveling, a current flowing from the terminal k to the terminal j when accelerating is adjusted to match the set vehicle speed. An acceleration signal is output from the terminal k so as to flow, and a deceleration signal is output from the terminal j so as to flow a current from the terminal j to the terminal k when decelerating. Thus, the motor 1
6 is appropriately rotated in the normal and reverse directions to control the driving of the accelerator pedal so that the actual vehicle speed falls within an allowable value with respect to the set vehicle speed.

By turning off the main switch 5, the clutch drive circuit 26 and the motor drive circuit can be turned off, and the actuator 15 can be made inoperative. According to the present circuit, when the main switch 5 is turned off, the state can be determined by detecting the decrease in the supply voltage of the power supply circuit 21 by the voltage detection circuit 32 as described above. Accordingly, the deceleration signal generation circuit 33 is activated, and the output signal of the deceleration signal generation circuit 33 is input to the OR circuit 28. In addition, since the drive control signal is not output from the CPU 22 which has been inactivated due to the voltage drop, an H (high level) signal is input to both input terminals of the deceleration-side AND circuit 29, and the deceleration-side AND circuit 29 Outputs a deceleration drive signal, and the motor 16 can rotate to the deceleration side. Therefore, when the main switch 5 is turned off, the motor 16 can be returned to the initial position. The supply voltage of the power supply circuit 21 gradually decreases with the time constant of the circuit. The time constant may be such that the motor 16 can be rotated to the deceleration side and returned to the initial position, for example, about 200 mm seconds. good.

FIG. 2 shows another embodiment based on the present invention. The same parts as those in the above embodiment are denoted by the same reference numerals, and the detailed description thereof will be omitted. In this embodiment, one end of a coil of a relay RY as an auxiliary deceleration drive circuit is connected to a node between the normally closed contact S2 of the brake switch 12 and a terminal of the control unit 1, and the other end of the coil is grounded. ing. The relay RY has a pair of two-position selectable movable contacts S3 and S4, and the common terminal of one drive contact S3 is connected to one end of the motor 16 via a normally closed contact lower limit switch 18. The common terminal of the other movable contact S4 is also connected to the other end of the motor 16 via the normally closed contact upper limit switch 19.

The normally open terminal of the movable contact S3 is connected to the deceleration output terminal j of the control unit 1, and the normally closed terminal of the movable contact S4 is connected to the node of the fuse 4 and the main switch 5. The normally open terminal of the movable contact S4 is connected to the acceleration output terminal k, and the normally closed terminal of the movable contact S4 is grounded. Therefore, in the normal running state where the brake pedal is not depressed, the relay RY is in the ON state, and the motor drive terminals jk of the control unit 1 and the motor 16 are in the connected state. The acceleration / deceleration signal output terminals O2 and O3 of the CPU 22
Is connected to a motor drive circuit 34 composed of a transistor bridge circuit as an acceleration / deceleration drive circuit. The motor drive circuit 34 changes the direction of the current flowing between the terminals j and k in accordance with the acceleration / deceleration signal to correct the motor 16. It is designed to be reversed.

In this embodiment, when the main switch 5 is turned off, the power supply voltage supplied to the coil of the relay RY via the normally closed contact S2 of the brake switch 12 is cut off. State. Then
When both contacts S3 and S4 switch, the control unit 1
Is disconnected from the motor drive terminals j and k, and the power supply voltage is directly supplied to one terminal of the motor 16 via the contact S3, and the other terminal of the motor 16 is grounded. Therefore, regardless of the state of the control unit 1, the motor 16 can be driven to the reduction side.

[0021]

[Effect of the Invention] As described above, according to the present invention, the main
Supply to the control circuit due to contact failure of the switch's control circuit side contact.
If the supplied power supply voltage drops, another
The auxiliary deceleration drive circuit outputs a deceleration signal to the motor to activate
Drive the motor to the deceleration side.
The actuator can be returned to the initial position even if the point is defective.
Error signal and noise enter the control circuit and
If the main switch is turned off when the road malfunctions,
However, the auxiliary deceleration drive circuit separate from the control circuit
Output to the motor to drive the actuator to the deceleration side.
Thus, even when the control circuit malfunctions, the actuator can be returned to the initial position. In addition, a relay circuit is provided between the acceleration and deceleration drive circuits and the actuator, and switching is performed when the voltage drops on the control circuit side of the main switch.
By directly supplying the power supply voltage to the deceleration side of the actuator via the relay circuit in the state, the actuator can be similarly driven to the deceleration side and returned to the initial position.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram of a constant speed traveling device according to the present invention.

FIG. 2 is a view similar to FIG. 1 showing another circuit of the constant speed traveling device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control unit 2 battery 3 ignition switch 4 fuse 5 main switch 6 main lamp 7 vehicle speed sensor 8 ignition sensor 9 set switch 10 resume switch 11 fuse 12 brake switch 13 clutch switch 14 brake lamp 15 actuator 16 motor 17 magnet clutch 17a coil 18 lower limit Limit switch 19 Upper limit switch 21 Power supply circuit 22 CPU 23 Reset circuit 24/25 I / O circuit 26 Clutch drive circuit 27 Acceleration AND circuit 28 OR circuit 29 Deceleration side AND circuit 30/31 Knot circuit 32 Voltage detection circuit 33 Deceleration signal generation Circuit 34 Motor drive circuit

Continued on the front page (72) Inventor Seiichi Ogino 1-2681, Hirosawa-cho, Kiryu-shi, Gunma Co., Ltd. Inside Mitsuba Electric Works (72) Kazuhiko Tachikawa 1-2681-1, Hirosawa-cho, Kiryu-shi, Gunma Co., Ltd. Inside Mitsuba Electric Works (72) Inventor Akihisa Kimura 1-2681, Hirosawa-cho, Kiryu-shi, Gunma Prefecture Inside Mitsuba Electric Works, Ltd. (56) References JP-A-2-37047 (JP, A) JP JP-A-1-262226 (JP, A) JP-A-2-45228 (JP, A) JP-A-2-56024 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60K 31 / 00-31/18 F02D 11/10 F02D 29/02 301

Claims (2)

(57) [Scope of request for utility model registration] 1. A control circuit for performing arithmetic control to maintain a vehicle speed at a set vehicle speed and generating a control signal; a main switch provided between a power supply and the control circuit; and a vehicle speed control operation based on the control signal. And an auxiliary deceleration drive circuit for driving the actuator to a deceleration side when the voltage on the control circuit side of the main switch is reduced. reduction drive circuit, wherein the provided and the main switch between the main switch and the control circuit
A power supply circuit capable of supplying a voltage that gradually decreases with a time constant of the circuit even when the control circuit side voltage decreases, a voltage detection circuit for detecting a decrease in the supply voltage of the power supply circuit, and the voltage detection circuit The power supply and the node of the main switch are provided between the deceleration drive circuit to output a deceleration drive control signal separate from the control circuit to the deceleration drive circuit when the voltage drop detection signal is generated. A constant speed traveling device for a vehicle, comprising a deceleration signal generating circuit. 2. A control circuit for performing arithmetic control to maintain a vehicle speed at a set vehicle speed and generating a control signal; a main switch provided between a power supply and the control circuit; and a vehicle speed control operation based on the control signal. And an auxiliary deceleration drive circuit for driving the actuator to a deceleration side when the voltage on the control circuit side of the main switch is reduced. When the main switch is turned on, the deceleration drive circuit connects the acceleration / deceleration drive circuit and the actuator, and the control circuit side voltage of the main switch
Wherein a voltage of a direction to drive the speed reduction side actuator so as to supply directly to the actuator, to have a relay circuit provided between the node and the actuator of the power source and the main switch when but decreased A constant-speed traveling device for a vehicle, comprising: