Patent Number: 6,332,452

Title: Method for torque monitoring in the case of Otto engines in motor vehicles

Abstract: The invention proposes a method for torque monitoring in the case of Otto engines in motor vehicles, in which a reference torque value (M.sub.0) is derived from the speed (n) of the Otto engine and the air mass (L) supplied and, in homogeneous lean operation (lambda=1 to 1.4), this reference torque value (M.sub.0) is corrected by a signal derived from a signal (.lambda..sub.ist) from a lambda probe and is then compared with a torque value (M.sub.max) specified by the driver. Torque-reducing interventions in the control of the engine are performed if the corrected reference torque value (M.sub.0) exceeds the torque value (M.sub.max) specified by the driver by a specifiable factor or value. This method allows reliable and accurate torque monitoring, even at lambda values greater than 1.

Inventors: Debusmann; Martin (Karlsruhe, DE), Roulet; Tobias (Leonberg, DE)

Assignee: DaimlerChrysler AG

International Classification: F02D 41/22 (20060101); F02D 41/30 (20060101); F02D 11/10 (20060101); F02D 041/40 ()

Expiration Date: 12/25/2018