发明名称 |
Closed loop air/fuel ratio controller with asymmetrical proportional term |
摘要 |
A closed loop air/fuel ratio controller for an internal combustion engine includes a control circuit responsive to the output of an exhaust gas sensor representing at least the sense of deviation of the air/fuel ratio of the mixture supplied to the engine from stoichiometry and provides a control signal which is used to adjust the air/fuel ratio of the mixture supplied to the engine in direction tending to restore a stoichiometric air/fuel ratio. The control signal includes an integral correction term and an asymmetrical proportional correction term that abruptly shifts the value of the control signal upon a detected change in at least one direction in the sense of the deviation of the air/fuel ratio from a stoichiometric air/fuel ratio. The asymmetrical proportional term provides either singularly or in combination with an asymmetrical integral term a scheduled air/fuel ratio offset from the stoichiometric air/fuel ratio with the offset value being a function of the system gains and the limit cycle frequency of the control signal that is determined primarily by the transport delay through the engine and exhaust system.
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申请公布号 |
US4228775(A) |
申请公布日期 |
1980.10.21 |
申请号 |
US19780961645 |
申请日期 |
1978.11.17 |
申请人 |
GENERAL MOTORS CORPORATION |
发明人 |
SCHWEIKERT, JOHN F. |
分类号 |
F02D41/14;(IPC1-7):F02M7/00;F02B3/00 |
主分类号 |
F02D41/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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