System and method for monitoring the feeding of secondary air into the exhaust as of an internal combustion engine
First Claim
1. A method for monitoring feeding of secondary air into an exhaust gas of an internal combustion engine, comprising:
- providing at least two partly separate exhaust systems in each of which are disposed a catalytic converter and, upstream thereof, a lambda probe;
delivering secondary air to one of the respective exhaust systems via a secondary air pump and a plurality of individual secondary air lines corresponding to the exhaust systems; and
determining a signal a value for a total air mass flow introduced into the exhaust systems from at least one air mass meter, whereinto determine the air mass actually introduced into the individual exhaust systems, the output signals from the lambda probes in the exhaust systems are used to identify an uneven distribution of the air mass fed to each of the exhaust systems, and an uneven distribution is determined by repeatedly forming a ratio of two output signals or the ratio of values derived from the output signals, and, if a predefined number of results falling outside a predefined tolerance band is exceeded, an uneven distribution is deemed to be present.
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Accused Products
Abstract
The internal combustion engine has at least two partly separate exhaust systems in each of which are disposed a catalytic converter, and upstream thereof, a lambda probe. There is provided a secondary air pump and a number of individual secondary air lines, corresponding to the number of exhaust systems, for delivering secondary air to the respective exhaust systems. From the signal of at least one air mass meter, a value is determined for the total air mass flow introduced into the exhaust systems. In order to determine the air mass actually introduced into the individual exhaust systems, the output signals from the lambda probes in the exhaust systems are used to identify an uneven distribution of the air mass fed to the individual exhaust systems.
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Citations
18 Claims
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1. A method for monitoring feeding of secondary air into an exhaust gas of an internal combustion engine, comprising:
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providing at least two partly separate exhaust systems in each of which are disposed a catalytic converter and, upstream thereof, a lambda probe; delivering secondary air to one of the respective exhaust systems via a secondary air pump and a plurality of individual secondary air lines corresponding to the exhaust systems; and determining a signal a value for a total air mass flow introduced into the exhaust systems from at least one air mass meter, wherein to determine the air mass actually introduced into the individual exhaust systems, the output signals from the lambda probes in the exhaust systems are used to identify an uneven distribution of the air mass fed to each of the exhaust systems, and an uneven distribution is determined by repeatedly forming a ratio of two output signals or the ratio of values derived from the output signals, and, if a predefined number of results falling outside a predefined tolerance band is exceeded, an uneven distribution is deemed to be present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for monitoring feeding of secondary air into an exhaust gas of an internal combustion engine, comprising:
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at least two partly separate exhaust systems in each of which are disposed a catalytic converter, and upstream thereof, a lambda probe; a secondary air pump and a plurality of individual secondary air lines corresponding to the plurality of exhaust systems to deliver secondary air to each of the respective exhaust systems; and at least one air mass meter from whose signal a value for the total air mass flow introduced into the exhaust systems can be determined, wherein to determine the air mass actually introduced into each of the exhaust systems, the output signals from the lambda probes in the exhaust systems are used to identify an uneven distribution of the air mass fed to the individual exhaust systems, and an uneven distribution is determined by repeatedly forming a ratio of two output signals or the ratio of values derived from the output signals, and, if a predefined number of results falling outside a predefined tolerance band is exceeded, an uneven distribution is deemed to be present.
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Specification