JPS6183462A - Throttle valve controller for vehicles - Google Patents

Abstract

PURPOSE:To reduce a rate of fuel consumption, by making a throttle valve fully open at a time when an engine speed becomes more than that preset at every shift step of a transmission. CONSTITUTION:A judging device is provided with shift switches S1-S5 and speed sensors N1-N4, and compares the engine speed preset at every shift step of a transmission with the actual engine speed. When the actual engine speed is higher than that, an actuator 6 is driven, making a throttle valve 4 come into a state of being fully closed. With this constitution, since the throttle valve can be made into the fully closed state to the extent of a limitation of the engine speed where an engine stall may occur, at every shift step of a transmission, a rate of fuel consumption is thus improved.

Description

Detailed Description of the Invention A1 Objective of the Invention (1) Industrial Application Field The present invention provides a fully closed drive section for driving a throttle valve of a carburetor to fully close the throttle valve during vehicle deceleration. and a control signal generation circuit that inputs a control signal for driving the throttle valve fully closed to the fully closed driving section when all of various preset conditions are satisfied.

(2) Conventional technology When a vehicle is decelerated, the throttle valve is fully closed to cant the fuel spouted from the idle boat of the carburetor, which is highly effective in reducing fuel consumption.

On the other hand, if the fully open state is not released under the conditions that occur during the deceleration process, the engine will stall.

Therefore, in the past, when the clutch pedal is depressed, when the vehicle speed is below a certain value, or when the engine speed is below a certain value, whichever is less (when one of them is satisfied, the throttle control during the deceleration process is The valve is released from the fully closed state.

(3) Problems to be solved by the invention By the way, the limit at which engine stall occurs is the limit of the engine's driving force, and that driving force is determined by the reduction ratio of each gear and the engine rotation speed. The engine speed limit at which engine stall occurs is different for each stage. However, in the past, the set value of the engine speed was determined based on the limit engine speed of the highest gear. Since the closed state has been released, there is still room for reduction in fuel consumption.

The present invention was developed in view of the above circumstances, and it sets a set value for the engine speed for each gear, and changes the condition for fully closing and releasing the throttle valve when the vehicle decelerates for each gear. An object of the present invention is to provide a throttle valve control device for a vehicle that further reduces fuel consumption.

B1 Structure of the Invention (1) Means for Solving Problems The device of the present invention has a fully closed condition as a component of the fully closed condition when the engine speed is equal to or higher than a predetermined value for each gear stage of the transmission. A determining means is provided for inputting the closed condition signal to the control signal generation circuit.

(2) Effect The set value of the engine speed is different for each gear, and each gear can maintain the fully closed state of the throttle valve up to the limit where the engine stalls, thereby further reducing fuel consumption. I can do it.

(3) Embodiment Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.A throttle valve 4 is disposed in the intake path 2 of the carburetor 1 on the downstream side of the venturi section 3. When all of the various fully closed conditions described later are satisfied during vehicle deceleration, the fully closed drive unit 5 brings the fully closed state to an idle opening degree or less.

The fully closed drive unit 5 includes an actuator 6 that operates with negative pressure,
It consists of a solenoid valve 7. The actuator 6 is configured to fully close the throttle valve 4 via the actuating rod 11 by bending the diaphragm 10 against the return spring S due to the negative pressure acting on the negative pressure chamber 8. When the negative pressure supply to the throttle valve 8 is cut off, the spring force of the return spring 9 releases the fully closed state of the throttle valve 4. In addition, the solenoid valve 7 is
It is interposed in the middle of a negative pressure passage 13 that connects the intake passage 12 downstream of the throttle valve 4 and the negative pressure chamber 8,
The valve body 15 is actuated (configured) so as to open the negative pressure passage 13 by the excitation of the solenoid 14. Moreover, in the part of the negative pressure passage 130 closer to the intake passage 12 than the lunoid valve 7, the negative pressure passage 13 is opened. A throttle 16 is provided to prevent the throttle valve 4 from suddenly closing due to sudden intake negative pressure acting on the negative pressure chamber 8.

The solenoid 14 of the solenoid valve 7 is excited by a control signal from an AND gate 17 as a control signal generation circuit. The first to third fully closed condition signals A, B, and C are input to the IND gate 17.

The first fully closed condition signal A is output from the first determining means 18, and this first determining means 18 is connected to the OE gate 19 which outputs the first fully open condition signal 11, and the OR gate 1.
Four I! input signals to 9! VD gates 20, 21,
22, 23, and an OE gate 24 which inputs a signal to one input terminal of the A N D gate 20.

At both input ends of the OR gate 240, there is a first shift switch S1 that outputs a high level signal when the transmission is in the first gear, and a first shift switch S1 that outputs a high level signal when the transmission is in the second gear. The output second shift switch S2 is connected to the other input terminal of the AND gate 20, and a first rotation speed sensor N1 that outputs a high level signal when the engine rotation speed is, for example, 600 rpm or more is connected to the other input terminal of the AND gate 20. Connected. Both input terminals of the AND gate 210 include a third shift switch S3 that outputs a high-level signal when the third gear is selected, and a third shift switch S3 that outputs a high-level signal when the engine speed is, for example, 650.
A second rotation speed sensor N2 is connected which outputs a high level signal when the speed is above rpm, and a high level signal is output when the gear is in the fourth gear. a fourth shift switch S4 that outputs
A third rotation speed sensor N3 that outputs a high level signal when the engine rotation speed is, for example, 700 rpm or more is connected. Further, at both input terminals of the 4ND gate 230, there is a fifth shift switch S5 that outputs a high level signal when the gear is in the fifth gear, and a fifth shift switch S5 that outputs a high level signal when the engine speed is, for example, 750 rpm or higher. A fourth rotation speed sensor N4 that outputs a signal is connected.

The first determining means 18 outputs a high-level first fully closed condition signal when the engine speed exceeds a predetermined engine speed for each of the first to fifth gears. l
is output. That is, in the first and second gears, the engine rotation speed is 60 Orpm or more, in the third gear, the engine rotation speed is 65 Orpm or more, in the fourth gear, the engine rotation speed is 100 rpm or more, and in the fifth gear, the engine rotation speed is 100 rpm or more. When the engine speed is 75 rpm or more in the gear position of 5000 rpm, the first fully closed condition signal A at the high level is outputted from the first determining means 18.

The second fully closed condition signal B is output from the second determining means 25, and this second determining means 25 determines whether or not a clutch pedal (not shown) is depressed. When the clutch is not depressed, that is, when the clutch is in the connected state, the second fully closed condition signal B at a high level is output.

The third fully closed condition signal C is also output from the third determination means 26. Both input ends of the third determination means 26 include a vehicle speed sensor V that outputs a high level signal when the vehicle speed is, for example, 1 s-km/H or more, and a vehicle speed sensor V that outputs a high level signal when the vehicle speed is, for example, 1 s-km/H or more, and a vehicle speed sensor V that outputs a high level signal when the intake negative pressure is, for example, 150 s-km/H or more.
mmH! A negative pressure sensor P that outputs a high level signal when the pressure is 1 or more is connected, and the vehicle speed is 1skm/
H or more and when the intake negative pressure is 15071zf11 or more, the third determination means 26 outputs the third fully closed condition signal at a high level.

Next, the operation of this embodiment will be explained. During vehicle deceleration, when the first to third fully closed condition signals A to C are all at high level, the solenoid 14 is energized and the solenoid valve γ is opened. , the actuator 6 operates, the throttle valve 4 becomes fully closed, and the fuel injection from the carburetor 1 is canted, thereby reducing fuel consumption.

When at least one of the first to third fully closed condition signals I to C becomes low level when the throttle valve 4 is fully closed, the solenoid 14 is demagnetized and the throttle valve 4 is completely closed.
The fully closed state of the engine is released, but the first fully closed condition signal A related to the engine speed is set to a high level depending on the engine speed that is individually determined for each gear from 1st to 5th gears. The conditions are different. Therefore, it is possible to maintain the fully closed state of the throttle valve 4 up to the limit engine speed at which engine stall occurs for each gear stage, and it is possible to further reduce fuel consumption.

Although the above embodiments have been described in relation to a vehicle having gears up to the fifth speed, it goes without saying that the present invention can also be implemented in vehicles having gears higher or lower than that. In addition, when detecting each gear, vehicle speed,
Detection may also be performed by calculation using engine speed.

C0 Effects of the Invention As described above, the device of the present invention generates a control signal for a fully closed condition signal when the engine speed is equal to or higher than a predetermined value for each gear stage of the transmission, as a component of the fully closed condition. Since it is equipped with a determination means that is input to the circuit, the fully closed state of the throttle valve during vehicle deceleration can be maintained until the engine speed at which engine stall occurs at each gear stage, further increasing the fuel efficiency reduction effect. do.

[Brief explanation of the drawing]

The drawing is a block diagram of one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Carburetor, 4... Throttle valve, 5... Fully closed drive part, 17... AND gate as a control signal generation circuit, 18... Judgment means

Claims (1)

[Claims] a fully-close drive unit for driving the throttle valve of the carburetor to fully close the throttle valve when the vehicle decelerates; and a fully-close drive unit for driving the throttle valve to fully close when all preset various fully-close conditions are met. In a vehicle throttle valve control device including a control signal generation circuit that inputs a control signal to the fully-closed drive unit, as a component of the fully-closed condition,
A throttle valve control device for a vehicle, comprising a determining means for inputting a fully closed condition signal to the control signal generation circuit when the engine speed is equal to or higher than a predetermined value for each gear stage of the transmission.