JPS58206842A - Engine controller - Google Patents

Abstract

PURPOSE:To decrease the idling rotational speed during the neutral driving mode to reduce vibration by increasing the idling rotational speed only when the speed change shift position of an automatic transmission is at a drive position or a backward position, and the automobile is in a stop state. CONSTITUTION:While driving a car, a car speed switch 7 as a stop condition detecting means detects the car stop condition, and is turned ON. When a speed change shift position switch 8 detects that a shift lever 3 is in the speed change shift position of forwarding or backing, and is turned ON, steady-open contacts 10a and 11a of respective relays 10 and 11 are turned ON. Then, an electromagnetic valve 13 mounted on a carbureter 14 of the engine 1 is opened, gaseous mixture increased in quantity via bypass gaseous mixture passges 18 and 19 which make detour to a throttle valve 21, is supplied to the engine 1. For this reason, the idling rotational speed of the engine is increased more than that of the engine upon parking.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine control device for a vehicle equipped with an automatic transmission, and particularly to an engine control device for controlling the engine idling rotation speed when the gear shift position is forward or reverse and the vehicle is stopped. The present invention relates to a device for controlling.

Conventionally, the idle-link rotation speed of the engine has been controlled by controlling the idle-link rotation speed of the carburetor, for example, as described in page 8-41 of the "Automotive Engineering Handbook" revised third edition published by the Society of Automotive Engineers of Japan. A fixed method is used in which the speed is fixed at a manually adjusted value using a speed adjustment screw.

For example, during idle link operation when the shift lever of an automatic transmission is in the neutral or parking position, fuel is supplied to the engine from the idle fuel hole located downstream of the throttle valve of the carburetor. The supply amount is set to a rotational speed as low as possible in consideration of fuel economy within a range where engine stability is ensured.

However, if the gear shift position is set to forward or reverse in this state, and the vehicle is kept at a stop by braking, the idling rotational speed will decrease by about 50 to 1100 rpm due to converter resistance, and
If the engine becomes unstable due to fluctuations in combustion and the rotational speed decreases, engine vibrations due to the reaction force of the converter will significantly increase.

Therefore, in anticipation of this engine instability and increased vibration, in conventional engine systems for vehicles with automatic transmissions, the idle link between neutral and parking is increased to compensate for the decrease in idle link rotational speed at the forward or reverse shift position. The method is to give the carburetor a setting that generally keeps the rotational speed about 100 to 300 rpm higher than that of a vehicle with a manual transmission.

However, if the rotational speed is increased throughout the idle link regardless of the gear shift position, the rotational speed will increase excessively in neutral and parking, resulting in poor fuel efficiency.

1. In front engine/front drive vehicles, the engine and wheel drive system are integrated.
When the vehicle is stopped in the forward and reverse gear shift positions, engine vibration during idling increases significantly due to the reaction force of the converter, so it is recommended to take anti-vibration measures for the engine mounting system and vehicle body panels. becomes necessary,
There was a problem that the cost was high.

This invention was made by focusing on such conventional problems, and it reduces the idling rotational speed only when the automatic transmission is in the forward or reverse shift position and the vehicle is stopped. The present invention provides an engine control device that increases the performance of the engine.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, 1 is an engine, 2 is a front engine 9 with an integrated transaxle, and a front drive automatic transmission, which drives the wheels by a drive shaft 5.6.

3 is a shift lever for operating gear shift positions such as forward, reverse, neutral, and parking.

Reference numeral 7 designates a vehicle speed switch as a stop state detection means, which determines whether the vehicle is running or stopped by relating it to the rotation of the drive shafts 5 and 6 or to the oil pressure of the transmission system, and only when the vehicle is stopped. Turn on.

Reference numeral 8 denotes a shift shift position detecting means attached to the shift mechanism of the automatic transmission 2, which turns on only when the shift lever 3 is in the forward or reverse shift position.

Then, when both switches 7 and 8 are turned on.

Current flows through the conductors 70 and 80, which are connected to the battery 9, and the normally open contact 10a of the relay 10.11.

11a is turned on, which causes a current to flow through the conductor 12 and operates the solenoid valve 13 attached to the carburetor 14 of the engine 1.

When this electromagnetic valve 13 operates, the mixture passages 18 and 19 that bypass the throttle valve 21 are opened from being shut off and communicated with each other as shown in the figure, so that air flows from the direction of arrow A and fuel flows from the direction of arrow B. This mixture of air and fuel flows from the direction of arrow C through the passages 18 and 19 downstream of the throttle valve 21, and is taken into the engine 1 from the direction of the arrow.

In this way, in this embodiment, the stopped state of the vehicle and the forward or reverse gear shift position are detected by the switch 7.8, and upon detection, the solenoid valve 13 is operated to control the idle link supply to the engine 1. It is possible to control the additional air-fuel mixture amount, thereby controlling the idle link rotation speed.

In other words, switch 8 is pressed at the forward or reverse gear shift position.
is turned on, and only when the switch 7 is turned on with the vehicle stopped, the solenoid valve 13 opens the mixture passage 18, whereby the engine idle link mixture is transferred to the passage 18.
The amount is increased by the amount flowing through 19.

With this mechanism, it is possible to set the rotational speed during idling operation with the gear shift position in neutral and parking to the lowest rotational speed required for engine stability.

During idling operation when the gear shift position is in the forward or reverse position, an increase in the amount of air-fuel mixture can be measured, so the rotational speed is raised to counteract the converter resistance, thereby reaching a rotational speed that can reduce vibrations caused by the reaction force of the converter. This makes it possible to improve both the fuel economy and quietness of the engine.

Note that the solenoid valve 13 that opens and closes the air-fuel mixture passage 18 constitutes air-fuel mixture increasing means.

Further, as another example of the mixture increasing means, the mixture passage 1
8 and the solenoid valve 13, the throttle valve 21 can be forcibly opened by an actuator operated by electromagnetic force or engine suction negative pressure, and the timing at which this actuator operates the above-mentioned solenoid valve 13 can be changed. If the air-fuel mixture is increased by operating the air-fuel mixture, the same effect as described above can be obtained.

FIG. 2 is a configuration diagram showing another embodiment of the present invention,
Components corresponding to those in FIG. 1 are designated by the same reference numerals, and explanations of those portions will be omitted.

In this embodiment, the present invention is added to a mechanism for increasing the idle link rotation speed for the purpose of replenishing the battery with electric power when operating the equipment in a vehicle equipped with equipment with a large electrical load. .

25 is the control circuit, air conditioner/fan, light (illumination)
Based on a switch signal indicating the operation of an electric load such as an electric fan for cooling water, it is determined whether each electric load is operated or not, and the electromagnetic valve 24 is driven via the conductor 26.

Like the solenoid valve 13, the solenoid valve 24 opens the mixture passage 27 only when activated, increases the amount of the mixture, increases the idle link rotation speed regardless of the shift shaft position, etc., and increases the amount of charge to the battery 9. .

A discrimination circuit 28 for discriminating the vehicle speed switch signal and the gear shift position signal according to the present invention is added to this conventional control circuit 25, and the electromagnetic valve 13 is By driving , the same effect as in the embodiment shown in FIG. 1 described above can be obtained.

In addition to the vehicle speed and gear shift position signals, a brake switch signal (both foot-operated and manual type) is input to the discrimination circuit 28 as shown in the figure, so that in addition to the above-mentioned conditions, this brake switch signal If the solenoid valve 13 is driven only when the brake is inputted, the amount of air-fuel mixture will not be increased by the solenoid valve 13 when the brake is released when the vehicle starts, so converter shock at the time of starting the vehicle will be alleviated. , which is more advantageous in terms of vehicle quietness.

In addition, the part for increasing the mixture amount in the solenoid valve 24 system is integrated into the solenoid valve 13 system, the mixture increase system of the solenoid valve 24 is abolished, and the mixture increase system of the solenoid valve 13 is used, and further control is performed. The functions of the circuit 25 and the discrimination circuit 28 may be integrated, giving priority to the function of the Pj-specific circuit 28, so that both the charging reinforcement of the battery 9 and the engine vibration reduction of the present invention can be performed.

However, in that case, if priority is given to reducing engine vibration, fuel economy will inevitably be disadvantageous, but some of the effects of the present invention will still be achieved.

As explained above, according to the present invention, the air-fuel mixture is increased only when the vehicle is stopped and the gear shift position of the automatic transmission is in the forward or reverse position. Since the idle link rotation speed of the automatic transmission is increased, it is possible to lower the idle link rotation speed when the automatic transmission is in neutral or parked, ensuring fuel economy and reducing converter reaction when the vehicle is stopped. This has the effect of significantly reducing engine vibration caused by force and providing a quiet vehicle.

By reducing engine vibration, vibrations in the engine mounting system, meter panels around the vehicle body and driver's seat, steering system, etc. will be reduced, making it particularly useful as a vibration countermeasure for front-engine, front-drive vehicles. It becomes unnecessary to strengthen the rigidity, and it is also possible to reduce manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of this invention, and FIG. 2 is a block diagram showing another embodiment of this invention. 1...Engine 2...Automatic transmission 3...
Shift/° lever 7... Vehicle speed switch (stop state detection means) 8... Shift shift position switch (shift position detection means) 13.24... Solenoid valve 14.23... Carburetor 25
... Control circuit 28 ... Discrimination circuit Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] 1. In an engine of a vehicle with an automatic transmission, a shift position detection means for detecting whether the shift position of the automatic transmission is in a forward or reverse position; a stop state detection means for detecting a stop state of the vehicle; When the gear shift position detection means detects a forward or reverse gear shift position and the stopped state detection means detects a stopped state of the vehicle, the amount of air-fuel mixture supplied to the engine is increased to increase the idle link rotational speed of the engine. An engine control device characterized by being provided with a mixture increasing means.