JPS6042131A - Constant-speed running device for vehicle - Google Patents

Abstract

PURPOSE:To prevent abnormal increase in engine rotational speed due to the situation where gears are out of mesh during constant-speed running, by releasing operation of constant-speed running when it is detected that a shift lever is in a neutral position. CONSTITUTION:A transmission is provided with a neutral switch for detecting that a shift lever is in a neutral position. The neutral switch 20 is connected in series with a coil 21a of a relay 21, and a normally closed contact point 21b of the relay 21 is connected between a brake switch 3 and a release signal generator circuit 12. In event that gears come out of mesh during constant-speed running, the switch 20 goes ON, and the contact point 21b goes OFF to cut off current leading to the circuit 12. As a result, a release signal is generated by the circuit 12, and a set vehicular speed stored in a constant-speed running command circuit 10 is cleared to release a constant-speed running condition.

Description

[Detailed description of the invention] (a) Technical field The present invention prevents an abnormal increase in engine speed due to gear slippage during constant speed driving in a vehicle equipped with a manual IRI3 transmission equipped with a constant speed driving device. 0 Regarding Constant Speed Travel Devices for Vehicles (b) Prior Art Some recent vehicles are equipped with constant speed travel devices that automatically drive the vehicle at a constant speed. In such vehicles, when the driver sets the speed he or she wants to drive at a constant speed using a vehicle speed setting switch, the opening of the carburetor throttle valve is adjusted to zero the deviation between the actual vehicle speed and the set vehicle speed. Speed control is performed so that the actual vehicle speed becomes the set vehicle speed. This constant-speed traveling device is convenient for the driver because it is necessary to always press the accelerator pedal when driving at a constant speed on a highway or the like.

FIG. 1 is a block diagram of a constant speed traveling device for a vehicle equipped with a conventional manual transmission, and in the figure, 1 is a battery;
2 is an ignition switch; 3 is a brake switch that is turned off when the brake pedal is pressed; 4 is a clutch switch that is turned off when the clutch pedal is pressed; 5 is a set switch that is operated to drive the vehicle at a constant speed at a desired speed; 6 is a resume switch that is operated to return the vehicle to the original set speed after temporarily decelerating the vehicle, and 7 is an acceleration switch that is operated to further accelerate the vehicle from a constant speed running state of setting W and continuous speed. It's a switch. 8 is a reed switch-type speed sensor that outputs a pulse according to the vehicle speed, 9 is a 1F speed detection circuit that detects the pulse from the vehicle speed sensor 8 and outputs it as a vehicle speed signal, and 10 is when the set switch 5 is operated. A constant speed controller stores the vehicle speed signal from the vehicle speed detection circuit 9, compares this set vehicle speed with the actual vehicle speed according to the pulse from the vehicle speed sensor 8, and outputs a vehicle speed difference signal according to the difference as a constant speed running command signal. This is the speed command circuit. 11 is a power supply circuit for the constant speed running command circuit 10; 12 is a release signal generating circuit that releases the constant speed running state when the brake switch 3 or clutch switch 4 is turned off; 13 is a cruise lamp that lights up when the actual vehicle speed or the set vehicle speed is reached. , 14
15 is a cruise lamp drive circuit that controls turning on and off of the cruise lamp 13 based on the output from the constant speed running command circuit 10; 15 is a negative pressure introduction to the servo pulp 16 based on the command signal from the constant speed running command circuit 10; This is a valve drive circuit that controls the opening and closing operations of the pulp 16a and the atmosphere-introduced pulp 16b.

17 is an actuator that is driven by the negative pressure from the negative pressure introduction pulp 16a of the servo pulp 16 or the atmospheric pressure from the atmospheric air introduction valve 16b, and controls the opening degree of the throttle valve 18;
This is an engine that controls vehicle speed or acceleration using li control. Further, the part surrounded by the chain line is a controller which is a main part of the constant speed traveling device.

In such conventional vehicle constant speed traveling devices, when the brake pedal or clutch pedal is depressed, the brake switch 3
In addition, the clutch switch 4 is turned off to cancel the constant speed driving operation and return to the normal acceleration driving operation using the accelerator pedal, but if the driver accidentally touches the shift lever while driving at a constant speed. Or, in cars where the gear holding force is particularly weak, the constant speed driving operation will not be canceled even if the gear slips out due to vibration of the car body. However, when such gear slippage occurs, the vehicle speed decreases, so in order to open the negative pressure introducing pulp 16a of the servo pulp 16 and operate the actuator 17, the engine speed is increased and constant speed operation is performed. Therefore, there is a problem that an abnormal increase in engine speed is likely to occur. When the engine speed suddenly increases in this way, the engine sound increases abnormally, so the driver knows from this engine sound that a gear has slipped, and quickly presses the brake pedal to prevent the abnormal increase in engine speed. I'm trying to prevent it.

(c) Object and structure of the invention The present invention prevents an abnormal increase in engine speed when a transmission gear slips out during constant speed driving in a vehicle equipped with a manual transmission equipped with a constant speed driving device. Therefore, when it is detected that the shift lever is in the neutral position, the constant speed driving operation is canceled.

B) Embodiment FIG. 2 is a block diagram showing an embodiment of the constant speed traveling device according to the present invention, and the same reference numerals as in FIG. 1 indicate the same components. In this embodiment, the shift lever is
A neutral switch is provided in the transmission to detect that it is in the Utral position.
21a, the normally closed contact 21b of the relay 2] is connected in series with the brake switch 3 and the release signal generating circuit 12.
It is connected to the Other configurations are fl
; Exactly the same as the conventional example shown in FIG.

Now, in the constant speed driving device described above, if a gear slips out due to touching the shift lever while driving at a constant speed, the neutral switch 20 is turned on, the relay 21 is energized, and the Jx point 21b is turned off. . As a result, the ignition switch 2, clutch switch 4
The current path leading to the release signal generation circuit 12 via the brake switch 3 and the contact 21b is interrupted.

Therefore, a release signal is output from the release signal generation circuit I2 and is sent to the constant speed running command circuit 10 as described in 1. The set vehicle speed is cleared and the constant speed running state is divided by r. In this way, if a gear slips out, the constant speed driving operation is canceled, so
This creates a mechanism to prevent the engine speed from increasing excessively.

Additionally, some recent vehicles with manual transmissions detect the shape of the transmission and cut fuel in order to reduce exhaust gas during deceleration. C. The present invention can be implemented using a neutral switch that is installed in advance in the transmission of the own vehicle.

(e) As described in detail, the present invention provides a constant speed traveling device with 4Ai?
For vehicles equipped with manual transmissions, constant speed driving is canceled when the shift lever is detected to be in the neutral position, so the gear will shift to neutral even if the clutch is not operated while driving at a constant speed. Even if this occurs, the constant speed driving operation is canceled, so an abnormal increase in engine speed can be prevented. Furthermore, it is preferable for safe driving because it is unnecessary to use the conventional method of knowing when a gear is out of gear based on the engine sound and pressing the brake pedal hastily.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional constant speed traveling device, and FIG. 2 is a block diagram showing an example of a constant speed traveling device according to the present invention. 1...Battery, 2...Ignition switch, 3...Brake switch, 4...Clutch switch, 5...Set switch, 6...Resume switch, 7...Accelerate switch, 8 ... Vehicle speed sensor, 9... Vehicle speed detection circuit, 10... Constant speed running command circuit, 11... Power supply circuit, 12... Release signal generation circuit, 13... Cruise lamp, 14...・Cruise lamp drive circuit, 15...Bulb drive circuit, 16...
・Servo valve, 17...-actuator, 18...
・Throttle valve, 19...Engine, 20...
Neutral switch, 21...Relay Patent applicant: Nissan Motor Co., Ltd. Patent attorney: Hiroo Suzuki

Claims (1)

[Claims] In a device for driving a vehicle with a manual transmission at a constant speed set by a vehicle speed setting operation, a release means is provided for canceling the constant speed driving operation when it is detected that the shift lever is in the neutral position. A constant speed traveling device for a vehicle characterized by: