Diagnosis system for upstream gauge sensor, downstream absolute pressure sensor
AssigneeFord Global Technologies, LLC
InventorsAllan J. Kotwicki, Freeman Carter Gates, Hossein Bina
Life of this patent
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Abstract
A method for controlling an engine during sensor degradation uses a remaining active sensor. The engine has an exhaust gas recirculation system utilizing pressure sensors upstream and downstream of an orifice. The downstream pressure sensor is coupled to the engine intake manifold and is also used for engine air-fuel ratio control.
Claims13
A method for controlling an engine coupled to an exhaust gas recirculation system, the engine coupled to a first pressure sensor and the exhaust gas recirculation system coupled to second pressure sensor, the method comprising:
- determining whether at least one of the first and second pressure sensor has degraded;
- in response to said determination:
- discontinuing exhaust gas recirculation;
- calculating an engine air intake amount based on said first pressure sensor when said second signal has degraded;
- and
- calculating an engine air intake amount based on said second pressure sensor when said first signal has degraded.
A vehicle system comprising:
- an engine;
- an electric motor coupled to the engine, said motor capable of driving the vehicle when the engine is not producing power;
- an orifice coupled to the engine;
- a first gauge sensor coupled upstream of the orifice;
- a second absolute sensor coupled downstream of the orifice;
- a controller providing an indication in response to said motor driving the vehicle with the engine not producing power, and determining atmospheric pressure based on said upstream gauge pressure sensor and said downstream absolute pressure sensor in response to said indication.
A system for use with an engine comprising:
- an orifice
- a gauge pressure sensor coupled upstream of the orifice;
- an absolute pressure sensor coupled downstream of the orifice;
- a controller for indicating degradation of one of said gauge pressure sensor and said absolute pressure sensor based on a measured condition that is measured by the controller.
A method for controlling an engine coupled to an exhaust gas recirculation system, the engine coupled to a first pressure sensor and the exhaust gas recirculation system coupled to second pressure sensor, the method comprising:
- determining whether at least one of the first and second pressure sensor has degraded;
- in response to said determination:
- discontinuing exhaust gas recirculation;
- calculating an engine air intake amount based on the other of said determined at least one pressure sensor.
A method for controlling an engine coupled to an exhaust gas recirculation system, the engine coupled to a first pressure sensor and the exhaust gas recirculation system coupled to second pressure sensor, the method comprising:
- determining whether the first pressure sensor has degraded;
- in response to said determination:
- discontinuing exhaust gas recirculation;
- and
- adjusting a fuel injection amount into the engine based on said second pressure sensor to control engine air-fuel ratio.
A method for controlling an engine coupled to an exhaust gas recirculation system, the engine coupled to a first pressure sensor and the exhaust gas recirculation system coupled to second pressure sensor, the method comprising:
- determining whether the second pressure sensor has degraded;
- in response to said determination:
- discontinuing exhaust gas recirculation
- adjusting a fuel injection amount into the engine based on said first pressure sensor to control engine air-fuel ratio.
Dependencies are inferred from the claim text.