Method and devices for avoiding knocking on failure of an anti-knock regulator
First Claim
1. A method of preventing knocking in the event of failure of a knock control, in which a firing angle and/or ignition time of an engine having direct injection is regulated by using a knock control to prevent knocking during engine operation, in fault-free operation of the knock control, fuel is injected into the combustion chamber of a cylinder of the engine at least once per operating cycle, and the combustion is monitored by the knock control, wherein in the event of a disturbance in the knock control, the quantity of fuel injected and/or the number of injection operations per operating cycle is altered.
1 Assignment
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Accused Products
Abstract
A device having a monitoring circuit for a knock control and a control circuit (10) which initiates substitute measures in the event of a fault in the knock control, depending on the output signal (f) of the monitoring circuit, is described. The control unit is designed, for example, so that the number of fuel injection operations per operating cycle of a cylinder of the engine is increased as the substitute measure.
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Citations
9 Claims
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1. A method of preventing knocking in the event of failure of a knock control, in which a firing angle and/or ignition time of an engine having direct injection is regulated by using a knock control to prevent knocking during engine operation,
in fault-free operation of the knock control, fuel is injected into the combustion chamber of a cylinder of the engine at least once per operating cycle, and the combustion is monitored by the knock control, wherein in the event of a disturbance in the knock control, the quantity of fuel injected and/or the number of injection operations per operating cycle is altered.
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4. A device for preventing knocking in the event of failure of a knock control,
having a monitoring circuit for a knock control, which regulates a firing angle and/or ignition time of an engine having direct injection, and having a control unit (10) which initiates substitute measures to prevent knocking in the event of a fault in the knock control, depending on the output signal (f) of the monitoring circuit, wherein the control unit (10) is designed so that as a substitute measure, the injection quantity and/or the number of injection operations of fuel per operating cycle of a cylinder of the engine is altered.
Specification