Abstract: The invention relates to a method for measuring the armature position of a solenoid having a coil with a movable armature, constructed as a bistable linear magnet and activated in a switched mode by means of pulse width modulation, wherein the depth of the current peaks at the solenoid is measured as a measure of the inductance and the position of the movable armature.

Abstract: The invention relates to a method for measuring the armature position of a solenoid having a coil with a movable armature, constructed as a bistable linear magnet and activated in a switched mode by means of pulse width modulation, wherein the depth of the current peaks at the solenoid is measured as a measure of the inductance and the position of the movable armature.

Abstract: The invention relates to a control unit for a pressure regulating valve in a motor vehicle, preferably for a pressure regulating valve that adjusts the oil pressure, wherein a signal that corresponds to the pressure that is to be set can be transmitted to the control unit, the control unit is signal-connected on the output side to a pressure regulating valve for the fluid that is to be pressure adjusted, wherein the electrical current supply to the pressure regulating valve is provided by way of a PWM signal that is generated by means of the control unit and the control unit is embodied for the purpose of over-exciting the solenoid of the pressure regulating valve with a higher electrical current prior to influencing the pressure regulating valve with the electrical current that is associated with the pressure that is to be set for a period of time.

Abstract: A piezoelectric actuator of a multilayer design has a stack of piezoelectric layers and electrode layers arranged in between. The electrode layers are contacted by way of two outer electrodes, which have a multiplicity of wires. The outer electrodes are fastened in fastening regions on first side faces of the stack and are led around the edge of the stack that is closest to the respective fastening region.

Abstract: The invention relates to a control unit for a pressure regulating valve in a motor vehicle, preferably for a pressure regulating valve that adjusts the oil pressure, wherein a signal that corresponds to the pressure that is to be set can be transmitted to the control unit, the control unit is signal connected on the output side to a pressure regulating valve for the fluid that is to be pressure adjusted, wherein the electrical current supply to the pressure regulating valve is provided by way of a PWM signal that is generated by means of the control unit and the control unit is embodied for the purpose of over-exciting the solenoid of the pressure regulating valve with a higher electrical current prior to influencing the pressure regulating valve with the electrical current that is associated with the pressure that is to be set for a period of time.

Abstract: A piezoelectric actuator of a multilayer design which has a stack of piezoelectric layers and electrode layers arranged in between. The electrode layers are contacted by way of two outer electrodes, which have a multiplicity of wires. The outer electrodes are fastened in fastening regions on first side faces of the stack (11) and are led around the edge of the stack that is closest to the respective fastening region.