A method for detecting faults in the air system of internal combustion engines
A technology of air system and internal combustion engine, applied in the direction of internal combustion engine testing, internal combustion piston engine, combustion engine, etc., can solve the problems of not being able to provide data quickly, emission restrictions, and indication delays
Inactive Publication Date: 2009-12-30
GM GLOBAL TECH OPERATIONS LLC
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[0011] It has been shown that emissions can be limited by introducing oxygen concentration monitoring in the control of exhaust gas recirculation in the intake manifold
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[0018] Briefly, the method according to the invention is based on the use of a double check to monitor the oxygen concentration estimation deviation; first the oxygen concentration value in the intake manifold is checked, the other check is based on the oxygen concentration value in the exhaust manifold.
[0019] figure 1 A flowchart representing the operations to be performed to detect a fault in an air system according to the method of the present invention.
[0020] The method comprises a first step 100 of measuring the oxygen concentration in an exhaust gas stream passing a Universal Exhaust Gas Oxygen (UEGO) sensor arranged in an engine exhaust line. The UEGO sensor is arranged to provide an analog output proportional to the percentage of oxygen in the exhaust gas [O 2 ] em_UEGO .
[0021] In step 200, the electronic control unit ECU of the engine estimates the control value of oxygen entering the intake manifold [O 2 ] im_control , for example as disclosed in US Pat...
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A method for detecting faults in an air system of an internal combustion engine having an intake manifold and an exhaust manifold, the method comprising the steps of: -measuring an oxygen concentration of a gas flowing in the exhaust manifold; a) -estimating an intake oxygen control value in the intake manifold; -estimating an intake oxygen reference value in the intake manifold based on said oxygen concentration of the gas flowing in the exhaust manifold; -calculating an intake deviation value as a difference between the intake oxygen control value and the intake oxygen reference value; and -comparing said intake deviation value with a predetermined first threshold; b) -estimating an exhaust oxygen control value in the exhaust manifold; -calculating an exhaust deviation value as a difference between the exhaust oxygen control value and the oxygen concentration of the gas flowing in the exhaust manifold; and -comparing said exhaust deviation value with a predetermined second threshold; c) -determining an exhaust oxygen concentration setpoint indicative of the oxygen concentration in the exhaust manifold; -calculating a fresh airflow setpoint as a function of said exhaust oxygen concentration setpoint; -measuring a fresh air mass flow value; -calculating an airflow deviation as difference between said fresh airflow setpoint and the fresh air mass flow value; and -comparing said airflow deviation with a third predetermined threshold and a fourth predetermined threshold; and finally -detecting faults in the air system as a function of the combination of results of comparisons at step a), b) and / or c).
Description
technical field [0001] The invention relates to fault detection in the air system of an internal combustion engine. Background technique [0002] Combustion processes in internal combustion engines produce NO x (mainly NO and NO 2 ), CO, CO 2 , HC (hydrocarbons) and PM (particulate matter). [0003] CO 2 The amount depends on the amount of fuel injected into the cylinder, and the amount of CO and HC depends on the combustion efficiency of the internal combustion engine. NO x The amount of PM depends on the combustion temperature and the amount of oxygen introduced into the cylinder, while the amount of PM strictly depends on the air-fuel ratio (λ). [0004] To optimize the PM and NO produced x amount, the internal combustion engine is provided with an EGR (Exhaust Gas Recirculation) circuit. The EGR system recirculates exhaust gas from the exhaust manifold to the intake manifold in order to dilute the fresh air introduced into the internal combustion engine. This le...
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IPC IPC(8): G01M15/10
CPCF02D41/1456F02D41/22Y02T10/42F02D2200/0402F02D41/0002F02D41/18Y02T10/40
Inventor 南多·文内蒂利马西米利亚诺·梅拉莫里纳·布鲁诺
Owner GM GLOBAL TECH OPERATIONS LLC