Air-fuel ratio controlling device for diesel engine

Abstract

Abstract PURPOSE: To control air-fuel ratio to an appropriate rate constantly by controlling by feeding back suction air rate, exhaust return flow rate, and fuel injection rate to a constantly appropriate air-fuel ratio by the signal from a detector for the concn. of the compound in the exhaust gas provided in the exhaust system. CONSTITUTION: A control circuit 11 is provided to control actuators A, B of a suction throttle valve 8 and an EGR rate control valve device 9 so that the air-fuel ratio becomes an appropriate ratio which is stored in advance based on a signal from an O 2 sensor 12 which is an exhaust gas component detector provided in a part of an exhaust passage 4. The control circuit 11 also detects the result of controlling by the signal from the O 2 sensor 12, considers its influences on the safety and the stability of exhaustion and operation, and feed back-controls the throttle valve 8 by the actuator A to increase suction rate and the control valve device 9 by the actuator B to reduce EGR rate, and then controls an injection pump 7 by an actuator C to reduce the injection rate. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Yoshitsuna Terasaka
• 👤 Kenji Masaki
• 👤 Shigefumi Yasuhara

Bibliographic Details