JPS5941657U - Internal combustion engine exhaust recirculation device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional EGR (exhaust gas recirculation) device.
FIG. 2 is a block diagram of the control system. FIG. 3 is an explanatory diagram showing that in an internal combustion engine equipped with a manual transmission or an automatic transmission, an acceleration region and a steady region are determined on a two-dimensional table of the rotational speed and the required load Tp. FIG. 4 is an explanatory diagram showing the operating characteristics of a CVT engine in terms of the relationship between its rotational speed and generated shaft torque. FIG. 5 is a schematic configuration diagram of one embodiment of the present invention, and FIG. 6 is a flowchart showing the control concept thereof. FIG. 7 is a flowchart similarly representing another control concept. 1... Internal combustion engine, 2... Exhaust passage, 3
...Intake passage, 4... Throttle valve, 5...
...EGR passage (exhaust gas recirculation passage), 6...
EGR control valve (exhaust recirculation control valve), 9... Constant pressure valve, 10... Control circuit, 11... Solenoid valve, 12... Crank angle sensor , 13・
...Air flow meter, 14.14A...
・Memory table, 20... Continuously variable transmission (CV
T), 22...Vehicle speed sensor, 23...
Throttle valve opening sensor.

Claims (1)

[Scope of utility model registration request] A solenoid valve that supplies controlled negative pressure by diluting constant negative pressure with the atmosphere based on periodic opening and closing operations, and an exhaust recirculation control valve that opens and closes the engine exhaust recirculation passage in response to the controlled negative pressure from this solenoid valve. and a means for detecting the load condition of the engine.
The control circuit also includes means for detecting the rotational speed, and a control circuit that outputs a drive pulse signal to the solenoid valve in response to the engine operating state represented by the detected values from the load detection means and the rotational speed detection means. In the exhaust gas recirculation device,
A means for detecting an acceleration state of the engine is provided, and a circuit is formed in the control circuit to output a predetermined solenoid valve driving pulse signal different from that during steady state during acceleration based on the detection result from the acceleration detecting means. Exhaust recirculation system for internal combustion engines.