Method and device for identifying errors in emission-relevant control devices in a vehicle

摘要

A method and a device for identifying errors in emission-relevant control devices of a vehicle, such as the injection of fuel into a cylinder, allows error identification even if none of the sub-systems exceeds a predetermined threshold value. The method has the following steps: determining whether at least one parameter, which permits conclusions to be drawn about the emission behavior of the respective control device, lies in a desired range; if the parameter lies outside said desired range, an error value that correlates to an increase in emissions is stored; if the parameter is in the desired range, an error value of zero is stored; a total error value is formed from all error values of the control device and an error message is output if the total error value exceeds a predetermined threshold value.

主权项

1. A method of detecting faults in a plurality of emission-relevant control devices comprising the steps:
detecting a respective value for each of a plurality of different emission-relevant parameters, each emission-relevant parameter associated with emission behavior of one or more of the plurality of emission-relevant control devices; for each one of the emission-relevant parameters:
comparing the detected value for the respective emission-relevant parameter with a setpoint range associated with that emission-relevant parameter,storing a fault value for the the respective emission-relevant parameter based on the results of the comparison, including:
if it is determined that the detected value for the respective emission-relevant parameter lies outside of the associated setpoint range for that emission-relevant parameter, storing a fault value that correlates with an emission increase, andif it is determined that the detected value for the respective emission-relevant parameter lies within the associated setpoint range for that emission-relevant parameter, storing a fault value of zero, calculating a total fault value by adding all of the fault values of the plurality of parameters to form a sum, and providing a fault message if the total fault value exceeds a defined threshold value.