Method for operating an internal combustion engine, and corresponding device
AssigneeRobert Bosch GmbH
InventorsJuergen Sauler, Axel Heinstein
Life of this patent
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Abstract
A method and a device for operating an internal combustion engine are provided, in which in at least one cylinder, combustion of a fuel in a fuel/air mixture introduced into the cylinder takes place. Upon the occurrence of knocking, a baseline ignition angle in the at least one cylinder is retarded in steps, using a knock control system, to an adjustment angle from the basic ignition angle. When the adjustment angle exceeds a definable threshold value, activation of the knock prevention operation mode occurs, in which context an additional action reducing the knock susceptibility of the fuel/air mixture is taken and the adjustment angle is decreased so that the baseline ignition angle is advanced.
Claims26
A method for operating an internal combustion engine, comprising the steps of:
- combusting fuel in a fuel/air mixture introduced into at least one cylinder of the engine;
- retarding, using a knock control system, a baseline ignition angle in the at least one cylinder in steps upon occurrence of knocking, to an adjustment angle from the basic ignition angle;
- reducing knock susceptibility of the fuel/air mixture by taking at least one additional action, when the adjustment angle exceeds a definable threshold value;
- and
- decreasing the adjustment angle so that the baseline ignition angle is advanced, when the adjustment angle exceeds a definable threshold value.
A device for operating an internal combustion engine, having at least one cylinder, in which combustion of a fuel in a fuel/air mixture introduced into the at least one cylinder takes place, comprising:
- a microprocessor-based knock control system, wherein upon occurrence of knocking, a baseline ignition angle in the at least one cylinder is retarded in steps to an adjustment angle from the basic ignition angle, the control system including an arrangement for, when the adjustment angle exceeds a definable threshold value, providing an additional action reducing knock susceptibility of the fuel/air mixture, and decreasing the adjustment angle so that the baseline ignition angle is advanced.
Dependencies are inferred from the claim text.