Control device and control method for lean-burn engine

Details Control device and control method for lean-burn engine Control device and control method for lean-burn engine

1997-03-28

1998-09-29

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123417, F02D 4304

Patent

active

058133860

ABSTRACT:
A control device of a lean-burn engine has an electronic control unit. Upon start of switching from stoichiometric driving to lean driving, the control unit (10) derives, from a map, a target pressure (P0) and a basic opening degree (D0) of an idling speed control valve, serving as an air bypass valve, based on the throttle opening degree (TPS) and the engine rotation speed (Ne) at the start of the switching. The control unit supplies driving pulses (N) of a number corresponding to the basic opening degree (D0) to a stepper motor (32) of the idling speed control valve. Then, the control unit supplies the stepper motor with driving pulses of a number corresponding to an opening degree correction amount (D1) which in turn corresponds to a deviation between the target intake pressure (P0) and an actual intake pressure (PB), to thereby suppress a change in the torque at the time of switching between the rich driving, including the stoichiometric driving, and the lean driving of the lean-burn engine.

REFERENCES:
patent: 4434768 (1984-03-01), Ninomiya
patent: 4528956 (1985-07-01), Ogata et al.
patent: 4616621 (1986-10-01), Kuroiwa et al.
patent: 5381768 (1995-01-01), Togai et al.
patent: 5413078 (1995-05-01), Mitsunaga et al.

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