Mass air flow sensor signal compensation system
AssigneeCummins Inc.
InventorsMichael J. Ruth, Stewart D. Sullivan
Life of this patent
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Abstract
A method and system are disclosed for compensating a mass air flow signal produced by a mass air flow sensor in fluid communication with an air intake passageway of an internal combustion engine. A mass air flow signal produced by the mass air flow sensor is monitored and an expected oxygen concentration of exhaust gas produced by the engine is determined. A compensation parameter is determined as a function of the expected oxygen concentration and a measured value of the oxygen concentration of the exhaust gas. A compensated mass air flow value is determined as a function of the mass air flow signal and the compensation parameter.
Claims25
A mass air flow sensor signal compensation system comprising:
- an engine speed sensor configured to produce an engine speed signal indicative of rotational speed of an internal combustion engine,
- an oxygen sensor configured to produce an oxygen signal indicative of oxygen concentration of exhaust gas produced by the engine,
- a mass air flow sensor configured to produce a mass air flow signal indicative of a flow rate of fresh air into the engine, and
- a control circuit including a memory having stored therein instructions that are executable by the control circuit to determine an expected oxygen concentration of the exhaust gas as a function of the engine speed signal and a fuel flow value corresponding to a rate of fuel supplied to a fueling system of the engine, to determine a compensation parameter as a function of the expected oxygen concentration and the oxygen signal and to determine a compensated mass air flow value as a function of the mass air flow signal and the compensation parameter.
A method of compensating a mass air flow signal produced by a mass air flow sensor in fluid communication with an air intake passageway of an internal combustion engine, the method comprising:
- monitoring an oxygen signal produced by an oxygen sensor and indicative of an oxygen content of exhaust gas produced by the engine,
- determining an expected oxygen concentration of exhaust gas produced by the engine,
- determining a compensation parameter as a function as a function of the oxygen signal and the expected oxygen concentration, and
- determining a compensated mass air flow value as a function of the mass air flow signal and the compensation parameter.
A method of compensating a mass air flow signal produced by a mass air flow sensor in fluid communication with an air intake passageway of an internal combustion engine, the method comprising:
- monitoring the mass air flow signal produced by the mass air flow sensor,
- determining an expected oxygen concentration of exhaust gas produced by the engine,
- determining a compensation parameter as a function of the expected oxygen concentration and a measured value of the oxygen concentration of the exhaust gas, and
- determining a compensated mass air flow value as a function of the mass air flow signal and the compensation parameter.
Dependencies are inferred from the claim text.