JPS6352223B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake system for an automobile engine, and in particular, the intake air of the engine propagates through the turbocharger during low-speed full load of the engine where the supercharging capacity of the turbocharger is insufficient. The turbocharger and intake air detection system is used to alleviate pulsation and to alleviate the propagation of the increase in intake pressure through the turbocharger due to the follow-up delay of the turbocharger when the engine decelerates. An air valve is provided between the devices, and the opening/closing degree of the air valve is controlled according to the operating state of the engine to prevent the intake air detection device from being adversely affected by the intake pulsation.

An embodiment of the present invention shown in the drawings will be described below. In the figure, 1 is an air cleaner, 2 is an intake air detection device composed of a Karman overflow meter, 3 is a turbocharger, and 4 is installed in an intake pipe 5 between the intake air detection device 2 and the supercharger 3. 6 is a proportional action solenoid valve for opening and closing the air valve 4; 7 is an engine;
8 is a fuel injection valve that supplies fuel to the engine 7; 9 is a throttle valve linked to the accelerator pedal of the automobile; 10 is a valve opening degree detector for the throttle valve 9;
1 is a rotation speed detector of the engine 7, 12 is an exhaust pipe,
Reference numeral 13 denotes an electronic control device that includes the intake air detection device 2, a valve opening degree detector 10, and a rotation speed detector 11.
The electromagnetic valve 6 is driven so that the degree of opening and closing of the air valve 4 becomes a predetermined value.

The operation of the apparatus configured as above will be explained. When the engine 7 is operating at low speed, the intake pipe 5
The amount of intake air that flows in is small. Therefore, the amount of exhaust gas flowing through the exhaust pipe 12 is also small, and as a result, the rotational speed of the supercharger 3 is low, and the supercharging capacity of the supercharger 3 is not sufficient. During such low-speed operation, especially when the throttle valve 9 is fully open, the intake pulsation is intense as is well known, which adversely affects the intake air detection device 2. During such operation with a small amount of intake air, or based on the output signal of the intake air detection device 2, the electronic control unit 13 determines and drives the electromagnetic valve 6 to close the air valve 4 to a predetermined opening, thereby eliminating the intake pulsation. Propagation to the intake air detection device 2 is reduced. Intake pipe 5
The intake pulsation from the engine 7 does not propagate through the supercharger 3 due to operation in which a large amount of intake air flows into the engine 7 or the supercharger 3 has sufficient supercharging capacity. In this operation, the air valve 4 is fully opened.

Next, during deceleration when the throttle valve 9 is suddenly closed, the intake air drawn into the engine 7 decreases rapidly, but the supercharger 3 cannot follow this and rapidly decelerate. Therefore, the intake air pressurized by the supercharger 3 is reflected by the throttle valve 9 and flows back. In order to prevent the sudden pressure increase at this time from passing through the supercharger 3 and propagating to the intake air detection device 2, the air valve 4 is closed by the output signal of the valve opening degree detector 10. The time during which the air valve 4 is closed at this time varies somewhat depending on the operating condition of the engine 7, but is 0.5 to 2 seconds.

As described above, the present invention includes an air valve between a supercharger and an intake air detection device, controls the opening/closing degree of the air valve according to the operating state of the engine, and detects the intake air from the supercharger side. Since the intake pulsation propagating to the device side is reduced to a predetermined value or less, the detection accuracy of the intake air amount of an engine equipped with a supercharger is improved.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the present invention. In the figure, 1 is an air cleaner, 2 is an intake air detection device, 3 is a supercharger, 4 is an air valve, 5 is an intake pipe, 7 is an engine, and 9 is a throttle valve.

Claims (1)

[Scope of Claims] 1. A supercharger provided in an intake pipe of an engine, an intake air detection device that detects the amount of intake air drawn into the intake pipe, and a supercharger and an intake air detection device that detect the amount of intake air taken into the intake pipe. an air valve provided in between and opened and closed by a solenoid valve; a throttle valve provided in the intake pipe downstream of the supercharger; and an opening valve that detects the opening degree of the throttle valve and supplies an output signal. degree detector;
an electronic control device that receives an output signal from the valve opening degree detector that detects when the throttle valve is suddenly closed during engine deceleration and operates the solenoid valve to close the air valve to a predetermined opening degree; and the engine intake system, including. 2. The electronic control device operates the air valve according to the opening degree of the throttle valve or the output signal of the intake air detection device when the engine is operating at a low rotational speed and a low supercharging capacity of the supercharger. An intake system for an engine according to claim 1, characterized in that the intake system is controlled to close to a predetermined opening degree.