Abstract: A throttle valve of an internal combustion engine can be adjusted by an electrical system. A device and a method for adjusting the throttle valve include a set value signal generator which has a no-load switch and a full-load switch. By evaluating the position of these two switches, the desire of the driver to set full-load or no-load can be reliably detected and accordingly taken into account even when the set value signal generator is blocked.

Abstract: In a safety system for a stepper-motor drive, a stepper motor for operating a throttle valve has poles with windings. Each pole winding is divided into part-windings, each of which is driven by a dedicated output stage. As a result, in the event of a failure of a part-winding or an output stage, it remains possible to control the stepper motor.

Abstract: A tank ventilation system for an internal combustion engine includes a lambda control device and an intake section communicating with the engine; a throttle valve in the intake section and air flow rate meter in the intake section for determining a flow rate of air aspirated by the engine; a tank communicating with a reservoir for holding fuel vapors; a scavenging line communicating between the reservoir and the intake section downstream of the throttle valve to be scavenged by means of a scavenging air mass; a tank ventilation valve in the scavenging line for controlling the scavenging air mass; a control unit for triggering the tank ventilation valve during a scavenging event in given operating states of the engine; and a delivery line communicating between the reservoir and the intake section between the throttle valve and the air flow rate meter for delivering the scavenging air mass to the reservoir.

Abstract: A sensor signal from a sensor which measures vibration of an internal combustion engine is filtered by a filter to provide characteristic frequency components for a normal combustion. When the filter signal remains below a reference value, a fault signal is output to indicate a faulty combustion. The filter may be switchable band-pass filters whose output signals are measured for knocking of the motor or for normal combustion. A programmed control unit evaluates the output signals from the filter within a characteristic time segment.

Abstract: The invention is directed to a bypass throttle control for a motor vehicle. A cross section of a critical opening of the bypass throttle control past which a marginal edge of a throttle valve moves during its opening motion is designed such that no limiting edge of the opening that extends parallel to its marginal edge is present below an intermediate position of the throttle valve. As a result thereof, whistling noises that otherwise occur in integrated bypass throttle controls and an undesired deformation of a control characteristic curve are prevented.