Lean idle speed control using fuel and ignition timing

Details Lean idle speed control using fuel and ignition timing Lean idle speed control using fuel and ignition timing

2005-08-30

2005-08-30

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Engine speed regulator

Idle speed control

C123S339120, C123S339190, C123S339240

Reexamination Certificate

active

06935306

ABSTRACT:
A method is presented for idle speed control of a lean burn spark ignition internal combustion engine using a fuel-based control strategy. In particular, the idle speed control strategy involves using a combination of fuel quantity or timing and ignition timing to achieve desired engine speed or torque while maintaining the air/fuel ratio more lean than prior art systems. Depending on engine operating conditions, the fuel quantity or timing is adjusted to give a more rich air/fuel ratio in order to respond to an engine speed or torque demand increase. Additionally, due to operation close to the lean misfire limit, the spark ignition timing is adjusted away from MBT in response to an engine speed or torque demand decrease. The advantages of this fuel based control system include better fuel economy as well as fast engine response time due to the use of fuel quantity or timing and ignition timing to control engine output.

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