JPH0722826U - Constant speed traveling device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To improve the controllability of the constant-speed traveling device by detecting the operating position of the actuator when power is supplied to the constant-speed traveling device and when the power is cut off. [Constitution] In a constant speed traveling device having a constant speed traveling control circuit for controlling the opening of a throttle valve by an actuator 31 according to a vehicle speed difference between a set vehicle speed and an actual vehicle speed to cause the vehicle to travel at a constant vehicle speed at a constant speed, The main switch 8 that detects whether the actuator is in the operation position corresponding to the fully closed position of the throttle valve and closes the power supply circuit that supplies power to the constant speed traveling control circuit is off, and the actuator is the throttle valve. The actuator is determined to be abnormal when the actuator is not in the operation position corresponding to the fully closed position, and the power supply circuit is prohibited from being closed when the actuator is determined to be abnormal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle constant speed traveling device.

[0002]

[Prior art]

 Some recent vehicles are equipped with a constant-speed traveling device that automatically drives the vehicle at a constant speed. In such a vehicle, the driver accelerates the vehicle to the speed that he wants to drive at a constant speed, and when the vehicle speed is set to the desired speed by looking at the speedometer, the vehicle speed can be set using the vehicle speed setting buttons, etc. The opening of the throttle valve or the opening of the carburetor is adjusted so that the deviation between and is zero and the speed is controlled so that the actual vehicle speed becomes the set vehicle speed. Such a constant speed traveling device is known, for example, in Japanese Patent Laid-Open No. 59-58134, and when traveling at a constant speed on a highway or the like, it is not necessary to always depress the accelerator pedal. It is convenient.When the clutch pedal or the brake pedal is depressed, the constant-speed driving function is released, and when the accelerator pedal is depressed, the vehicle can accelerate beyond the set vehicle speed. When the accelerator pedal is stopped, the engine brake will decelerate and the speed will be set again. It is designed to run at a constant speed at the vehicle speed.

By the way, in this type of constant-speed traveling device, a constant speed is applied when the vehicle speed falls below a predetermined value (for example, 45 km / h) or when the vehicle speed falls below the set vehicle speed by a predetermined value (for example, about 13 km / h). The drive function is canceled. In addition, the voltage at a specific point of the constant speed traveling control circuit is checked, and when the voltage exceeds a predetermined value, the power supplied to the constant speed traveling control circuit is shut off.

However, it is desirable to look at the operating position of the actuator when the power is supplied to the constant speed traveling device or when the power is cut off.

[0005]

[The purpose and structure of the device]

 The present invention has been made in view of the above points, and an object thereof is to improve the controllability of the constant speed traveling device by detecting the operating position of the actuator when the power is supplied to the constant speed traveling device or when the power is cut off. In order to achieve this purpose, the actuator has a constant speed running control circuit that controls the opening of the throttle valve by the actuator according to the vehicle speed difference between the set vehicle speed and the actual vehicle speed to drive the vehicle at a constant vehicle speed. In the constant-speed traveling device, it detects whether or not the actuator is in the operating position that corresponds to the fully closed position of the throttle valve, and turns off the main switch that closes the power supply circuit that supplies power to the constant-speed traveling control circuit. If the actuator is not in the operation position corresponding to the fully closed position of the throttle valve, it is judged that the actuator is abnormal, and if it is judged that the actuator is abnormal. And configured so as to prohibit the closing of the source supply circuit.

[0006]

【Example】

 The present invention will be described below with reference to the drawings.

FIG. 1 shows an electric circuit of an embodiment of a constant speed traveling device according to the present invention, in which 1 is a battery, 2 is an ignition switch, 3 and 4 are fuses, and 5 is a horn switch 6 when turned on. It is a horn relay that is excited and operates so as to ring the horn 7. Reference numeral 8 is a main switch for constant speed traveling which is in an ON position and an OFF position, 9 is a constant speed traveling relay connected in series with the ignition switch 2 through a fuse 3, and the main switch 8 is the constant speed traveling relay 9 It is a self-holding switch that is self-holding (corresponding to the "power supply circuit" in the scope of the utility model registration request) and is provided in a part of the instrument panel. Reference numeral 10 is a main lamp that lights up when the main switch 8 is turned on.

Reference numeral 11 is a normally closed clutch switch that is turned off when the clutch is depressed, and 12 is a normally closed brake switch that is turned off when the brake is depressed. These switches 11 and 12 are connected in series to control It is connected to the input terminal T ₁ of the unit 30. In a vehicle with an automatic transmission, the cut relay and the inhibitor switch are connected in series instead of the clutch switch 11 and the brake switch 12 connected in series.

Further, 15 is a stop lamp switch which is turned on when the brake pedal is depressed and the stop lamp 16 is lit at that time, and 17 is used to set a desired vehicle speed for constant speed traveling and to decrease the set vehicle speed during constant speed traveling. Set / coast switch that is turned on when desired, 18 is an accelerator switch that is turned on when it is desired to increase the set vehicle speed during constant speed running, and 19 is a cancel switch that is turned on when the constant speed running function is released. These switches 17, 18, 19 is provided on a part of the steering wheel, and one contact of each switch is connected to the input terminals T ₂ and T ₃ of the control unit 30. A vehicle speed sensor 20 outputs a vehicle speed signal having a frequency corresponding to the vehicle speed, and this vehicle speed signal is also input to the control unit 30.

The control unit 30 has a microcomputer (hereinafter referred to as “microcomputer”) built therein. The microcomputer discriminates various conditions based on ON and OFF signals of various switches, and operates for the throttle valve indicated by a broken line. The actuator 31 is controlled.

The actuator 31 is a positive pressure type that uses compressed air to adjust the opening degree of a throttle valve, and includes a release valve 31a that releases compressed air from a compressed air tank to the atmosphere, an air valve 31b that opens to the atmosphere, and a compression valve. A supply valve 31c for supplying air is provided, and the throttle wire opening is controlled by a throttle wire connected to a diaphragm operated by these valves. Further, a tank for storing compressed air, which is a drive source of the actuator 31, is provided, and a pressure switch 31d which is turned on when the compressed air exceeds a certain value is provided in the compressed air tank. When the pressure switch 31d is turned on, the motor relay 31e is excited to open its normally closed contact to cut off the energization of the motor 31f, thereby stopping the operation of the compressor and stopping the increase of the air pressure in the tank. Thus, the air pressure in the compressed air tank is always maintained at a constant value. Reference numeral 32 denotes a cruise lamp that lights up when the actual vehicle speed matches the set vehicle speed.

One end of the coil 9 a of the constant speed traveling relay 9 is grounded via a diode D ₁ and an actuator stroke limit switch 13, and a connection point A between the diode D ₁ and the limit switch 13 and an ignition switch. A diode D ₂ and a resistor 14 are connected between the connection point B between the switch 2 and the fuse 3. The stroke limit switch 13 of the actuator is a switch that adjusts the opening of the throttle valve to detect the position of the actuator based on the stroke of the actuator, and is turned on when the actuator is completely back and is in the stroke fully closed position. Instead of the limit switch 13, a negative pressure switch that is turned on when the internal pressure of the actuator is atmospheric pressure may be used. In short, a switch that can detect whether or not the actuator has completely returned to the stroke fully closed position, that is, the inoperative position is sufficient. Reference numeral 21 is a logic circuit that determines the abnormal operation of the actuator by monitoring the ON / OFF state of the ignition switch 2, the potential of the connection point A, and the light-on / off state of the cruise lamp 32, and 22 is the logic circuit 21. A drive circuit that outputs an alarm signal based on the determination result, and an alarm buzzer 23 that generates an alarm sound by the alarm signal.

The operation and operation of the constant speed traveling device will be described below. When the main switch 8 is turned to the ON position while the ignition switch 2 is turned on, the constant speed traveling relay 9 is excited and held at the ON position. The main lamp 10 is turned on, and the power supply voltage is supplied from the battery 1 to the input terminals T ₁ and T ₄ of the control unit 30.

When the set / coast switch 17 is pressed when the vehicle speed at which the vehicle runs at a constant speed is reached, the control unit 30 stores the set vehicle speed and compares the actual vehicle speed signal output from the vehicle speed sensor 20 with the set vehicle speed. Then, the vehicle speed control signal is output to the output terminal T ₅ according to the difference. The actuator 31 controls opening / closing of the release valve 31a, the air valve 31b, and the supply valve 31c based on the vehicle speed control signal. That is, when the actual vehicle speed exceeds the set vehicle speed, the release valve 31a is closed, the air valve 31b is opened, the supply valve 31c is closed, and the throttle valve is closed. When the actual vehicle speed is less than the set vehicle speed, the release valve 31a is closed. Close the air valve 31b, open the supply valve 31c and open the throttle valve.

In this way, the opening of the throttle valve is adjusted, the engine speed is controlled, and the actual vehicle speed is controlled to be the set vehicle speed.

When the clutch pedal or the brake pedal is depressed while the vehicle is traveling at a constant speed in this way, the clutch switch 11 or the brake switch 12 is opened, so that the power supply voltage to the input terminal T ₁ of the control unit 30 is cut off. As a result, the power supply to the actuator 31 is cut off and the constant speed traveling control is stopped. The same applies when the constant-speed running main switch 8 is turned off.

On the other hand, when the cancel switch 19 is turned on during traveling at a constant speed, the control unit 30 stops the vehicle speed control operation because the power supply voltage is simultaneously supplied to the input terminals T ₂ and T _{3 of the} control unit 30. .

When it is desired to increase the set vehicle speed during traveling at a constant speed, the accelerator switch 18 is kept pressed and when the desired vehicle speed is reached, when the accelerator switch 18 is released, the vehicle speed at that time is set. When it is desired to decrease the set vehicle speed during constant speed running, the set / coast switch 17 is continuously pressed to decelerate by engine braking, and when the desired vehicle speed is reached, the current vehicle speed is set when the switch 17 is released.

The operation according to the present invention will now be described. When the ignition switch 2 is in the ON state and the actuator for adjusting the throttle valve opening is in the stroke fully closed position, the limit switch 13 is turned ON. When 8 is set to the ON position, a current flows through the coil 9a of the constant speed traveling relay 9 and the relay 9 is held by itself, and the power supply voltage is supplied to the terminals T ₁ and T ₄ of the control unit 30 as described above. At this time, the potential of the connection point A is the ground potential, and the logic circuit 21 judges that the actuator is normal and does not output.

On the other hand, when the actuator is not returned to the stroke fully closed position, the limit switch 13 is off, so even if the main switch 8 is turned on, the coil 9a of the constant-speed traveling relay 9 will receive a current. Does not flow and the main switch 8 does not turn on. As a result, the power supply to the terminals T ₁ and T _{4 of} the control unit 30 is prohibited. At this time, the potential of the connection point A is at a high level, and therefore the logic circuit 21 judges that the actuator is abnormal and outputs it. As a result, an alarm signal is output from the drive circuit 22 and the alarm buzzer 23 sounds to notify the actuator of abnormality.

That is, when the main switch 8 is OFF (non-constant speed running) but the actuator is not in the stroke fully closed position, it is determined that the actuator is abnormal, and in this state, if the main switch 8 is in the ON position. Even if it is set, the power is not supplied to the device.

However, the logic circuit 21 does not output when a high level is output from the output terminal T ₆ of the control unit 30 during traveling at a constant speed, and therefore the alarm buzzer does not sound at this time.

FIG. 2 shows an electric circuit of another embodiment of the constant speed traveling device according to the present invention. In this embodiment, constant speed traveling control is performed even when power is supplied to the constant speed traveling device. If the actuator is not in the fully closed position, it is considered abnormal and the power supply to the device is cut off to ensure safety.

In this embodiment, a stroke limit switch 13 that is turned on when the actuator is completely back and is in the stroke fully closed position is connected to the connection point between the ignition switch 2 and the fuse 3, and the switch 13 is turned on. , OFF state, the output side potential of the relay 9, and the on / off state of the cruise lamp 32 to determine whether or not the operation of the actuator is abnormal, and based on the determination result by this logic circuit 24. A drive circuit 25 controlled by the drive circuit 25 is provided, and a relay 26 having a normally-closed contact between one end of the coil 9a of the relay 9 and the ground and having a coil excited by the drive circuit 25 is provided. When the input terminals a and c of the logic circuit 24 are at "H" level and the input terminal b is at "L" level, the drive circuit 25 is operated to de-energize the relay 26, but the input terminal a is at "H" level. When the input terminals b and c are at "L" level, the drive circuit 25 is activated to excite the relay 26.

Now, while the ignition switch 2 is ON and the actuator 31 is operating during constant speed traveling, the stroke limit switch 13 is OFF, the constant speed traveling switch 9 is ON, and the cruise lamp 32 Is lit. As a result, the input terminals “a” and “c” of the logic circuit 24 become “H” level, the input terminal “b” becomes “L” level, and the relay 26 is not excited and the contacts are kept closed because the operation of the actuator is normal. is there.

By the way, if the clutch pedal or the brake pedal is depressed during constant-speed traveling to release the constant-speed traveling control, the constant-speed traveling main switch 8 remains ON, but the cruise lamp 32 is turned off. The input terminal a of the logic circuit 24 remains at "H" level, but the input terminal c becomes "L" level. At this time, if the actuator returns to the fully closed position and the stroke limit switch 13 is turned on and the input terminal b is at the "H" level, the relay 26 is not excited by the logic of the logic circuit 24 and the constant speed traveling main switch 8 is in the on state. However, when the actuator is not in the fully closed position and the stroke limit switch 13 is in the OFF state, the input terminal b of the logic circuit 24 becomes "L" level, so it is judged to be abnormal at this time. Then, the logic circuit 24 excites the relay 26 via the drive circuit 25 to open the contact. As a result, the contacts of the constant speed traveling relay 9 are opened, the power supply to the input terminals T ₁ and T _{4 of the} control unit 30 is cut off, and the power supply to the actuator is cut off.

[0027]

[Effect of device]

 As described above, in the present invention, whether or not the actuator for adjusting the throttle valve opening in the constant speed traveling device is located at the operation position (that is, the inoperative position) corresponding to the fully closed position of the throttle valve. Since the power supply circuit for supplying power to the constant speed traveling control circuit is configured so as not to be closed based on the above, the controllability of the constant speed traveling device is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an electric circuit of a constant speed traveling device according to the present invention.

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

[Explanation of symbols]

 1 Battery 2 Ignition Switch 8 Main Switch for Constant Speed Running 9 Relay for Constant Speed Running 13 Limit Switch 21 Logic Circuit 22 Drive Circuit 23 Alarm Buzzer 30 Control Unit 31 Actuator

Front page continued (72) Inventor Koichi Suzuki, 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Hiroyuki Nomura, 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Isao Yamamoto 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Kinichiro Nakano 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor, Yoshiyuki Eto Kanagawa 2 Takaracho, Kanagawa-ku, Yokohama-shi Nissan Motor Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. According to a vehicle speed difference between a set vehicle speed and an actual vehicle speed,
In a constant speed traveling device having a constant speed traveling control circuit for controlling the opening of a throttle valve by an actuator to drive a vehicle at a constant speed, a power supply circuit for supplying power to the constant speed traveling control circuit is closed. So as to turn on the main switch, a detection means for detecting whether or not the actuator is in the operation position corresponding to the fully closed position of the throttle valve, the main switch is off, and the actuator is operated by the detection means. A determination unit that determines that the actuator is abnormal when it is detected that the actuator is not in the operation position corresponding to the fully closed position of the throttle valve; and a case where the determination unit determines that the actuator is abnormal. A constant-speed traveling device comprising: a prohibition unit that prohibits closing of the power supply circuit.