US 6,332,452 B1 · 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 (M0) 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 (M0) is corrected by a signal derived from a signal (λist) from a lambda probe and is then compared with a torque value (Mmax) specified by the driver. Torque-reducing interventions in the control of the engine are performed if the corrected reference torque value (M0) exceeds the torque value (Mmax) 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.

Claims14

Dependent claims

A method for monitoring torque in an engine for use in a motor vehicle, said engine having a lambda probe giving a lambda for the operation of the engine, said method comprising the steps of:

operating the engine in a stratified condition, wherein lambda is greater than 1.4, said operating said engine in said stratified condition comprises the steps of:
identifying a speed (n) of the engine;
identifying a fuel mass (K) supplied to the engine;
deriving a reference torque value (Mg) from said speed (n) and said fuel mass (K);
comparing said reference torque value (Mg) with a torque value (Mmax) specified by a driver of the vehicle;
performing torque-reducing intervention means if said reference torque value (Mg) exceeds said torque value (Mmax) by a specifiable amount.

3 more elements

A method for monitoring torque in an engine for use in a motor vehicle, said engine having a lambda probe giving a lambda for the operation of the engine, said method comprising the step of:

operating the engine in a homogeneous lean condition, wherein lambda is between 1 and 1.4, said operating said engine in said homogeneous lean condition comprises the steps of:
identifying a speed (n) of the engine;
identifying an air mass (L) supplied to the engine;
deriving a reference torque value (Mo) from said speed (n) and said air mass (L);
identifying a lambda signal (λist) from the lambda probe;
correcting said reference torque value (Mo) by said lambda signal and comparing said reference torque value with a torque value (Mmax) specified by a driver of the vehicle;
performing torque-reducing intervention means if said reference torque value exceeds said torque value (Mmax) by a specifiable amount.

4 more elements

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims14