Vitesco Technologies Gmbh

Siemens Aktiengesellschaft

Continental Automotive Gmbh

Wolfgang Stowasser

Suk-Ju Kim

Thomas Burkhardt

Franz Kunz

Andreas Brunnhoelzl

Various embodiments include a method for actuating a camshaft adjuster of an internal combustion engine, in which a current is generated in an electric motor of the camshaft adjuster comprising: measuring an instantaneous strength of the current; calculating a mean value of the measured strength of the current over a predefined elapsed time; measuring a temperature of the camshaft adjuster; comparing the mean value of the measured strength of the current to a threshold value obtained from a characteristic diagram stored in a memory based on the measured temperature and the predefined elapsed time; and reducing the current if the calculated mean value of the strength of the current is higher than the threshold value.

Method and device for actuating a camshaft adjuster

A method according to the invention for controlling an internal combustion engine having a camshaft whose phase with respect to a crankshaft can be adjusted by means of an electric adjustment device, and a control device comprises the steps S1 to S3, wherein in step S1 a stop request is output from the control device to the electric adjustment device. Subsequently, in step S2 a manipulated variable in the form of a pulse duty factor is output from the electric adjustment device, wherein the pulse duty factor counteracts a camshaft torque. In step S3, the direction of rotation of the camshaft is monitored, wherein in step S4, when a reversal of the direction of rotation of the camshaft is detected, an intensity level of this reversal of the direction of rotation is calculated by determining a rotational speed gradient. Furthermore, in a step S5 the pulse duty factor is corrected as a function of the rotational speed gradient in such a way that the influence of the reversal of the direction of rotation on the position of the camshaft is compensated.

Method for controlling an internal combustion engine having a camshaft

The present disclosure relates to internal combustion engines. Various embodiments of the teachings may include a method for adjusting an actuator element for a camshaft of an internal combustion engine, wherein the actuator element is coupled to the camshaft to adjust a camshaft setting. The method may include determining a torque imposed by a component of the engine, based on an operating parameter and controlling an adjuster of the actuator to counteract the determined torque and resist adjustment of the actuator element and the camshaft setting. Without controlling the adjuster, the torque is transmitted from the camshaft to the actuator element and can bring about an adjustment of the actuator element and of the camshaft setting. The magnitude of the adjustment corresponds to the torque imposed by the component.

Method for adjusting an actuator element for a camshaft of an internal combustion engine

An actuator which is displaced by a force in one end position and is displaced into the other end position by an adjusting device that is controlled using a pulse duration modulated signal. If a quasi-stationary condition is identified, in which despite repeated control intervention the actual position of the actuator lies outside a targeted range around the desired position, the retaining pulse duty factor which is used by the adjusting device to main the actuator in one position is modified based on the distance from the desired position. If drift is identified, the drift behavior is determined and the retaining pulse duty factor is modified according to said drift behavior.

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Wuppertal, Germany

Wolfgang Stowasser