Method and device for monitoring a drive of a drive system of a motor vehicle

Abstract

The method involves determining whether a motor car (1) is in an overrun condition, where a drive of the motor car does not provide drive torque in the overrun condition. A temporal speed threshold value characteristic is determined based on a momentary vehicle speed and a preset detention of the motor car on a linear distance when the overrun condition is determined. An error is determined when the momentary vehicle speed present during the overrun condition exceeds a threshold value, which is predetermined by the threshold value characteristic. Independent claims are also included for the following: (1) a monitoring device for monitoring a drive system of a vehicle (2) a drive system of a vehicle comprising a drive motor (3) a computer program product comprising instructions for performing a method for monitoring a drive system of a vehicle on errors.

Description

technical field [0001] The invention relates to a drive system for a motor vehicle, in particular to a method for monitoring faults of the drive that lead to undesired acceleration or deceleration of the motor vehicle. Background technique [0002] A large number of engine functions of the internal combustion engine are carried out in a motor controller which activates the internal combustion engine. Calculation errors, bit flips (bitkippers) and the like can produce false outputs in unsecured motor controllers, which can lead to damage in motor vehicles in severe cases A welcome acceleration, for example due to too high a fuel injection quantity, or an undesired deceleration, for example in the case of a hybrid drive due to the activation of an energy recuperation function. Since such faults can create situations that endanger persons in road traffic, it is necessary for the motor controller to independently detect such faults and place the motor vehicle in a safe state. ...

AI Technical Summary

Problems solved by technology

Defects in such compensating mechanisms cannot be reliably detected by torque monitoring and require separate monitoring

[0012] Due to the requirements in terms of exhaust gas aftertreatment, fuel injection occurs more and more often during the coasting of gasoline engines, so that conventional inertia monitoring cannot be meaningfully used in gasoline engines

Rather, such an injection likewise does not constitute a relevant drive torque, since the energy of the injected fuel is dissipated as a hot exhaust gas flow without a change in torque, but this is not possible during inertial monitoring. ignore this extra injection volume

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