JPH0532084U - Constant-speed traveling device for vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] Return the motor to the initial position when the main switch is turned off. [Structure] A voltage detection circuit 32 for detecting a decrease in supply voltage of a power supply circuit 21 for supplying a voltage to a CPU 22 is provided. The voltage detection circuit 32 is connected to a deceleration signal generation circuit 33 that outputs a deceleration signal in response to the detection of the voltage drop. The output signal of the deceleration signal generation circuit 33 is input to the deceleration side AND circuit 29 that outputs the deceleration drive signal for the motor 16. The power supply voltage that drops when the main switch 5 is turned off is detected by the voltage detection circuit 32, and a deceleration driving signal can be output separately from the CPU 22 from the deceleration side AND circuit 29 according to the detection.
6 can be driven to the deceleration side. [Effect] The motor 16 can be driven to the deceleration side when the main switch 5 is turned off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle constant-speed traveling device, and more particularly, to a main control circuit that outputs a drive control signal to an actuator that performs vehicle speed control operation by performing arithmetic control to maintain the vehicle speed at a set vehicle speed. The present invention relates to a vehicle constant-speed traveling device which is selectively supplied via a switch.

[0002]

[Prior Art]

 Generally, various constant speed traveling devices for maintaining the speed of a vehicle at a predetermined set speed have been publicly known. According to such a constant speed traveling device, when the accelerator pedal is operated to reach a desired vehicle speed, the set switch is operated to operate an actuator that operates in the same manner as the accelerator pedal, and thereafter, the accelerator pedal is operated. The vehicle speed can be maintained at the set speed even if you take your foot off.

Some of the above-mentioned constant speed traveling devices use a motor type actuator, for example, there is one 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 constant speed traveling control, the clutch drive circuit is turned on, the clutch is connected, and the operating member of the actuator is driven and controlled by the motor. When stopping the constant speed running control, for example, if the main switch is turned off, the power supply voltage is not supplied to the control unit, so the motor drive circuit and clutch drive circuit are turned off and the actuator is not activated. Can be in a state.

[0004]

[Problems to be solved by the device]

 The main object of the present invention is to provide a control circuit for a vehicle constant speed traveling device which can return the motor to the initial position when the main switch is turned off.

[0005]

According to the present invention, there is provided a control circuit for performing arithmetic control to generate a control signal for maintaining a vehicle speed at a set vehicle speed, and a power supply and the control circuit. A main switch, an acceleration and deceleration drive circuit for driving an actuator that performs vehicle speed control operation based on the control signal, and the main switch for driving the actuator to the deceleration side when the main switch is cut off. The present invention is achieved by providing a constant speed traveling device for a vehicle, comprising an auxiliary deceleration driving circuit provided between a switch and the actuator. In particular, the auxiliary deceleration drive circuit detects a decrease in the supply voltage from the power supply circuit provided between the main switch and the control circuit and the power supply circuit that gradually decreases when the main switch is cut off. To output a deceleration drive control signal to the deceleration drive circuit, which is separate from the voltage detection circuit for deceleration and the control circuit when the voltage drop detection signal is generated by the voltage detection circuit. It is preferable to have a deceleration signal generating circuit provided between the node and the deceleration driving circuit.

[0006]

[Action]

 With this configuration, when the main switch is turned off, the auxiliary deceleration driving circuit can drive the actuator to the deceleration side. In particular, when the voltage detection circuit detects a voltage drop in the power supply circuit, the deceleration drive control signal is output by the deceleration signal generation circuit connected to the power supply side of the main switch to drive the motor to the deceleration side.

[0007]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described 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 the battery 2 as a power source is supplied to the power supply terminal a of the control unit 1 that performs constant-speed traveling control via the ignition switch 3, the fuse 4, and the main switch 5 in this order. The other end of the main lamp 6 whose one end is grounded is connected to the node of the switch 5 and the terminal a. A vehicle speed sensor 7 is connected to the terminal b of the control unit 1, and an ignition sensor 8 is connected to the terminal c. Further, one end of the set switch 9 is connected to the terminal d, one end of the resume switch 10 is connected to the terminal e, and the other end of each of the switches 9 and 10 is connected to the battery 2 via the common fuse 11a. It is connected.

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

The actuator 15 of the constant speed traveling device is a motor drive type, and an operating member (not shown) is selectively connected to an output shaft of a motor 16 capable of rotating in the forward and reverse directions via a magnet clutch 17. An accelerator pedal (not shown) is also connected to the operating member. One end of the coil 17a of the magnet clutch 17 is grounded, and the other end is connected to the clutch output terminal i of the control unit 1.

Further, both ends of the motor 16 are connected to the motor output terminals j and k of the control unit 1, respectively, and when a current flows from the terminal j to the terminal k, the motor 16 rotates on the acceleration side. When the current flows from the terminal k to the terminal j, the motor 16 rotates on 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 that can bypass the lower limit switch 18 and pass a current toward the terminal j has a lower limit. It is provided in parallel with the limit switch 18. Similarly, an upper limit switch 19 is connected between the terminal k and the other terminal of the motor 16, and the diode D 2 that can bypass the upper limit switch 19 and flow a current toward the terminal k. Are provided in parallel with the upper limit switch 19.

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

The acceleration signal output terminal O2 of the CPU 22 is connected to one input terminal of a 2-input 1-output type acceleration side AND circuit 27 as an acceleration drive circuit, and the output terminal of the acceleration side AND circuit 27 is a terminal. connected to j. The deceleration signal output terminal O3 of the CPU 22 is connected to one input terminal of a 2-input 1-output type OR circuit 28, and the output terminal of the OR circuit 28 is of a 2-input 1-output type as a deceleration drive circuit. It is connected to one input terminal of the deceleration AND circuit 29. The acceleration signal output terminal O2 of the CPU 22 is connected to the other input terminal of the deceleration side AND circuit 29 via the knot circuit 31, and the output terminal of the OR circuit 28 is connected to the acceleration side via the knot circuit 30. It is connected to the other input terminal of the AND circuit 27.

A voltage detection circuit 32 for detecting a decrease in the supply voltage value of the power supply circuit 21 is connected to the nodes of the power supply circuit 21 and the CPU 22, and the output terminal of the voltage detection circuit 32 is decelerated. The signal generation circuit 33 is connected. The output terminal of the deceleration signal generation circuit 33 is connected to the other input terminal of the OR circuit 28 described above. When the main switch 5 is turned off and the power is turned off, the above-mentioned supply voltage of the power supply circuit 21 decreases, but when the voltage detection circuit 32 detects that the supply voltage is 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 by the OR circuit 28 and the knot circuits 30 and 31 via the voltage detection circuit 32 and the deceleration signal generation circuit 33. An auxiliary deceleration drive circuit capable of outputting signals to 27 and 29 is configured.

In the device configured as described above, by turning on the ignition switch 3 and turning on the main switch 5, a power supply voltage is supplied to the control unit 1 and a main lamp for displaying the state is displayed. 6 lights up. When the set switch 9 is turned on during traveling, 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 signals such as the brake switch 12 and the clutch switch 13 are not input. Is stored as, and constant speed traveling control is performed. In this constant-speed traveling control, the accelerator pedal is driven by the motor 16, so that a clutch connection signal is output from the terminal i to energize the magnet clutch 17, and the coil of the magnet clutch 17 is excited.

When the difference between the set vehicle speed and the actual vehicle speed exceeds a permissible value due to the load variation during traveling, the current flowing from the terminal k to the terminal j at the time of acceleration is adjusted to match the set vehicle speed. The acceleration signal is output from the terminal k so that the current flows, and the deceleration signal is output from the terminal j so that the current flowing from the terminal j to the terminal k flows when decelerating. In this way, the motor 16 is appropriately rotated in the normal and reverse directions to drive and control the accelerator pedal so that the actual vehicle speed falls within an allowable value relative to the set vehicle speed.

By the way, 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 deactivated. According to this circuit, when the main switch 5 is turned off, the state can be detected by the voltage detection circuit 32 to detect the decrease in the supply voltage of the power supply circuit 21 as described above, and the detection signal 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 no longer output from the CPU 22 that is in the inactive state due to the low voltage, the H (high level) signal is input to both input terminals of the deceleration side AND circuit 29, and the deceleration side AND circuit 29 is input. A deceleration drive signal is output from the circuit 29, 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. Although 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. May be

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

The normally open side terminal of the movable contact S3 is connected to the deceleration output terminal j of the control unit 1, and the normally closed side terminal of the movable contact S4 is connected to the fuse 4 and the node of the main switch 5. The normally open side terminal of the movable contact S4 is connected to the acceleration output terminal k, and the normally closed side terminal of the movable contact S4 is grounded. Therefore, in the normal running state in which the brake pedal is not depressed, the relay RY is on and the motor drive terminals j and k of the control unit 1 and the motor 16 are in the connected state. A motor drive circuit 34 constituted by a transistor bridge circuit as an acceleration / deceleration drive circuit is connected to the acceleration / deceleration signal output terminals O2 and O3 of the CPU 22, and both terminals j and k are connected according to the acceleration / deceleration signal. The direction of the current flowing through the motor 16 is changed to rotate the motor 16 in the forward and reverse directions.

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, so that the relay RY is not excited. It becomes a state. Then, the contacts S3 and S4 are switched, the connection state between the motor drive terminals j and k of the control unit 1 and the motor 16 is released, and the power supply voltage is directly applied to one terminal of the motor 16 through the contact S3. Since the power is supplied and the other terminal of the motor 16 is grounded, the motor 16 can be driven to the deceleration side regardless of the state of the control unit 1.

[0021]

[Effect of the device]

 As described above, according to the present invention, when the main switch is turned off, the actuator can be driven to the deceleration side by a separate circuit regardless of the deceleration driving signal of the control circuit. Also, when the main switch is turned off, it detects the power supply voltage drop and activates the deceleration drive circuit according to the detection signal, so that the actuator is driven to the deceleration side when the main switch is turned off. To return to the initial position.

[Brief description of 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]

 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 Input / output circuit 26 Clutch drive circuit 27 Acceleration side 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

Front page continuation (72) Inventor Seiichi Ogino 1-2681 Hirosawa-cho, Kiryu-shi, Gunma Mitsuba Electric Mfg. Co., Ltd. Inside the Leaf Electric Works (72) Inventor Akihisa Kimura 1268-1, Hirosawa-cho, Kiryu-shi, Gunma Mitsuba Electric Works Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A control circuit for performing arithmetic control to generate a control signal to maintain the vehicle speed at a set vehicle speed, a main switch provided between a power source and the control circuit, and a vehicle speed control operation based on the control signal. An acceleration and deceleration driving circuit for driving an actuator that performs the following: an auxiliary deceleration driving circuit provided between the main switch and the actuator to drive the actuator to the deceleration side when the main switch is cut off. A constant speed traveling device for a vehicle, comprising: 2. A power supply circuit provided between the main switch and the control circuit, and a supply voltage from the power supply circuit, which is gradually reduced when the main switch is cut off. A voltage detection circuit for detecting,
Between the node of the power supply and the main switch and the deceleration driving circuit, in order to output a deceleration driving control signal separate from the control circuit to the deceleration driving circuit when the voltage drop detection signal is generated by the voltage detecting circuit. The constant speed traveling device for a vehicle according to claim 1, further comprising a deceleration signal generating circuit provided in the vehicle.