Magneti Marelli France

Solex

Weber S.r.l.

Philippe Wallerand

Christophe Genin

Francesco Paolo Ausiello

Olivier Quelenis

Gas torque (Cg) is determined for each cylinder combustion. Engine speed (N) and air admission manifold pressure (Pca) are measured during the corresponding prior admission phase. A reference torque (Cref), which is a function of N and Pca, is cartographically calculated by interpolation. The reference torque Cref, for example, is corrected by multiplication with a coefficient (KM) associated with the corresponding cylinder in a stabilized engine operating mode. In a transient mode, an additive correction (KA) is also made to derive the expected theoretical torque (Cpr), which is compared with the gas torque (Cg) so as to determine that misfire has occurred if Cpr/Cg>S2, where S2 is a threshold value. The process and device are suitable for generating signals representative of engine operation or indicating that the threshold level of harmful components discharged into the exhaust gases is exceeded.

Method and device for detecting misfires in a controlled-ignition internal combustion engine

Method and apparatus for detecting misfires in a controlled ignition

Engine control system with motorized butterfly body

The device controls a throttle member of an induction passage in a fuel supply system. It comprises a first electric sensor for delivering a signal representing the position of a driver actuated member, an electric actuator and a second electric sensor providing an electric signal representing the actual position of the throttle member. The actuator and the sensor are mechanically connected to the throttle member. An electric control circuit receives signals from the sensor and gives the throttle member a position which depends on the position of the driver actuated member. A movable stop is mechanically connected to the driver actuated member and has a one-way connection with the throttle member which limits its degree of opening.

Throttle member control device for an internal combustion engine fuel

Growing community of inventors

Sartrouville, France

Philippe Wallerand