Method and arrangement for recognizing misfires
First Claim
1. A method for recognizing misfires in an internal combustion engine, the method comprising the steps of:
- determining the maximum exhaust-gas pressure for each exhaust stroke;
determining an exhaust-gas pressure expected value for each exhaust stroke from values of operating parameters of the engine;
comparing the maximum exhaust-gas pressure to the corresponding exhaust-gas pressure expected value and emitting an occurrence signal whenever the two values deviate from one another by more than a specified difference;
determining the rate of occurrence of the occurrence signals; and
,whenever the rate of occurrence exceeds a threshold value, either directly emitting a fault signal or determining further rates of occurrence which then lead to the emission of a specified fault signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An arrangement for recognizing misfires in an internal combustion engine has a sensor (15) for measuring the exhaust-gas pressure and a means (16, 17, 18) for recording the measurement values of the sensor for each clock pulse. Each exhaust-gas pressure measurement value is compared to a corresponding expected value and an occurrence signal is emitted when the two values differ from one another by more than a specified difference. A means (21) for recognizing and treating faults determines the rate of occurrence of the occurrence signals and emits a fault signal when the rate of occurrence determined exceeds a threshold value. A warning lamp lights up on receipt of the fault signal.
This arrangement for recognizing misfires has a simple construction because the ignition in all the cylinders of an internal combustion engine (11) can be simultaneously monitored by means of a single sensor. In addition, it is possible to determine faults in the exhaust-gas line (12) as well as misfires.
21 Citations
11 Claims
-
1. A method for recognizing misfires in an internal combustion engine, the method comprising the steps of:
-
determining the maximum exhaust-gas pressure for each exhaust stroke; determining an exhaust-gas pressure expected value for each exhaust stroke from values of operating parameters of the engine; comparing the maximum exhaust-gas pressure to the corresponding exhaust-gas pressure expected value and emitting an occurrence signal whenever the two values deviate from one another by more than a specified difference; determining the rate of occurrence of the occurrence signals; and
,whenever the rate of occurrence exceeds a threshold value, either directly emitting a fault signal or determining further rates of occurrence which then lead to the emission of a specified fault signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An arrangement for detecting misfires in an internal combustion engine, the arrangement comprising:
-
sensor means for measuring the exhaust-gas pressure; means for detecting the maximum exhaust-gas pressure of for each exhaust stroke; means for determining an exhaust-gas pressure expected value from values of operating parameters for each exhaust stroke; means for comparing each exhaust-gas pressure measurement value with the corresponding expected value and for emitting an occurrence signal when the two values deviate from one another by more than a specified difference; means for determining the rate of occurrence of the occurrence signals; and
,means for emitting a fault signal when the determined rate of occurrence exceeds a threshold value. - View Dependent Claims (11)
-
Specification