Process for controlling a combustion engine
AssigneeMTU Friedrichshafen GmbH
InventorArmin Doelker
Life of this patent
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Abstract
Proposed is a method for controlling an internal combustion engine (1) with a common-rail injection system and a high-pressure control loop. In this method, a pump with an intake throttle (3) is controlled by means of an electronic control device (4) using a PWM signal with a first frequency. The invention provides that a critical speed is calculated from the angular distance between injections and the first frequency of the PWM signal. A speed range is then determined as a function of the critical speed. For engine speed values that fall outside this speed range, the PWM signal is set to the first frequency. For engine speed values that fall within the speed range, the PWM signal is set to a second frequency. Switching the PWM signal reduces the pressure oscillations in the rail (6).
Claims10
A method of regulating an internal combustion engine having a common rail injection system, whereby a manipulated variable is calculated from an actual value and a setpoint value of the rail pressure by means of a high-pressure regulator and a PWM signal with a first frequency for triggering the controlled system is determined as a function of the manipulated variable, wherein
- a critical rotational speed is calculated from the angular distance of two injections and the first frequency of the PWM signal, a rotational speed range is defined as a function of the critical rotational speed and at engine rotational speed values outside of this rotational speed range, the PWM signal is set at the first frequency or in the case of engine rotational speed values within the rotational speed range, the PWM signal is set at a second frequency.
Dependencies are inferred from the claim text.