JPS62218241A - Constant speed running gear for vehicle - Google Patents

Abstract

PURPOSE:To secure the same constant speed running performance with four gear speed and fifth gear speed different in power performance each, by detecting a gear position and discriminating whether it is in a state of being overdriven or not, then selecting the sensitivity of constant speed running control according to respective cases. CONSTITUTION:A constant speed running command circuit 10' stores a speed signal out of a speed detecting circuit 9 if a set switch 5 is operated, while it compares this setting speed with the actual speed conformed to a pulse out of a speed sensor 8, and outputs a speed difference signal conformed to the difference as a constant speed running signal command signal. In this case, when a vehicle is running in a state of being overdriven (or fifth gear speed), an over drive switch 20 is turned on, and the overdriving state is detected by a circuit 21, outputting it to the said circuit 10'. And, a changeover to the fifth gear speed is carried out with the said circuit 10', and the specified valve driving time is operated. With this constitution, a servo valve 16 is opened as long as the specified time according to the operation result, driving an actuator 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a constant speed traveling device for a vehicle with a manual transmission.

(Prior Art) Some recent vehicles are equipped with constant speed running 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 drivers because it is not necessary to constantly press the accelerator pedal when traveling at a constant speed on a highway or the like.

FIG. 3 is a block diagram of a conventional constant-speed traveling device for vehicles equipped with a manual transmission, and in the figure, l 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 the speed switch that is operated when the vehicle has been temporarily decelerated and returned to the original set speed.
Reference numeral 7 designates an acceleration switch that is operated when the vehicle is further accelerated from a constant speed running state at a set vehicle speed. 8
9 is a reed switch type vehicle speed sensor that outputs a pulse according to the vehicle speed; 9 is a vehicle speed detection circuit that detects a pulse from the vehicle speed sensor 8 and outputs it as a vehicle speed signal; 10 is a vehicle speed detection circuit 9 when the set switch 5 is operated; A constant speed driving command circuit that stores a vehicle speed signal from the vehicle speed sensor 8, 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 driving command signal. It is. 11 is a power supply circuit for the constant speed running command circuit IO; 12 is a release signal generation circuit that releases the constant speed running state when the brake switch 3' or clutch switch 4 is turned off; and 13 is a cruise signal that lights up when the actual vehicle speed or the set vehicle speed is reached. lamp, 1
4 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, and 15 is a negative pressure of the servo valve 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 introduction valve 16a and the atmosphere introduction valve 16b. 17 is the negative pressure introduction valve 1 of the servo HARTZ 16
An actuator 19 is driven by the negative pressure from 6a or the atmospheric pressure from atmospheric air introduction valve 16b to control the opening degree of throttle valve 18, and 19 is an engine that controls vehicle speed or acceleration by controlling the opening and closing of throttle valve 18. Further, the part surrounded by the chain line is a controller which is a main part of the constant speed traveling device.

By the way, in general, although the gear ratios of 4th and 5th speeds are far apart and there is a difference in power performance, in a vehicle with a manual transmission equipped with the above-mentioned conventional constant speed traveling device, 1.
Since the vehicle speed is controlled according to the vehicle speed, when running at a constant speed in 4th and 5th gears, it is not possible to obtain a source of constant speed running performance. However, when a torque change occurs on a slope, etc., there is a problem in that the sensitivity of the return is different and the stability of the control is impaired.

(Object and Structure of the Invention) The present invention has been made in view of the above points, and aims to obtain the same constant speed running performance regardless of the gear position. By doing so, 4th speed and 5th speed are distinguished, and the constant speed driving control is switched so that the same constant speed driving performance level can be obtained in 4th speed and 5th speed.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a constant speed traveling device according to the present invention, and the same reference numerals as in FIG. 4 indicate the same components. The main features of this embodiment are an overdrive switch 20 that turns on when the gear is put into the overdrive position, and an overdrive switch 20 that turns on when the gear is placed in the overdrive position, in addition to the conventional constant speed traveling device shown in FIG. In addition to newly providing an overdrive detection circuit 21 that detects whether the gear position is in 5th gear, the constant speed running command circuit 10' is replaced with a 4th speed/5th speed switching circuit as shown in FIG. 22, a 4th speed control formula calculation circuit 23, a 5th speed control formula calculation circuit 24,
It is composed of a constant speed running command signal output circuit 25.

Next, constant speed running control in the present invention will be explained.

Assuming that both +l and L are running in an overdrive state (that is, 5th gear), the overdrive switch 20 provided in the transmission is turned on, and the overdrive detection circuit 21 detects the overdrive state and operates. Output to constant speed running command circuit lO°. As a result, in the constant speed running command circuit 1O°, the 4th and 5th speed switching circuit 22 switches to 5th speed, and the 5th speed control formula calculation circuit 24 is activated, and the vehicle speed difference between the actual vehicle speed and the set vehicle speed is and acceleration, the formula Ts = (f + (vehicle speed difference) + f2 (
Acceleration)) Based on XG2, the valve drive time T5 is calculated so that the valve output matches the power performance of the 5th speed. The constant speed running command signal output circuit 25 outputs a signal representing this drive time T5 to the valve drive circuit 15 (see FIG. 1). As a result, the servo valve 16 is opened during this time T5 to drive the actuator 17.

On the other hand, while the vehicle is running in 4th speed, the overdrive switch 20 is OFF, and the Saiichi hard drive detection circuit 21 and the 4th/5th speed switching circuit 22 are inactive. the result,
In the 4th speed control formula calculation circuit 23, 1 formula T4 = (f +
C vehicle speed difference) + f2 (acceleration)) x G + (tatashi a
, <a2), the valve driving time T4 is calculated so that the valve output matches the dynamism of the fourth speed. The actuator 17 operates for the drive time T4 calculated in this manner. 4th speed control formula calculation circuit 23 and 5
In the speed control formula calculation circuit 24, calculation formulas based on the gear ratios of the fourth and fifth speeds are changed in advance.

(Effects of the Invention) As explained above, according to the present invention, by detecting the gear position, it is possible to identify whether the overdrive state is in the overdrive state or not, and to switch the sensitivity of the constant speed driving control according to each case. With this configuration, the same constant speed running performance can be obtained in 4th and 5th speeds, which have different power performances.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the constant speed running device for a vehicle according to the present invention, Fig. 2 is a detailed block diagram of the constant speed running command circuit shown in Fig. 1, and the :jSs diagram is a conventional constant speed running command circuit. FIG. 2 is a block diagram of an example of a circuit. ■...Battery, 2...Ignition switch,
3... Brake switch, 4... Clutch switch, 5... Set switch, 6... Resume switch.

Claims (1)

[Claims] A device for driving a vehicle with a manual transmission at a constant speed set by a vehicle speed setting operation, comprising a gear position detection means for detecting whether the gear position is 4th gear or 5th gear; A constant speed traveling device for a vehicle, characterized in that it is provided with control switching means for switching to predetermined different constant speed traveling control sensitivities so that the same constant speed traveling performance can be obtained in both the fifth speed and the fifth speed.