US 9,174,651 B2 · Method and circuit arrangement in an electronic control unit of a motor vehicle for detecting faults

Abstract

In the case of a circuit arrangement in an electronic control unit of a motor vehicle for the detection of faults in an electronically controlled drive system, which is structured in at least two levels, a first function-controlling level and a second monitoring level, both levels acquire at least the accelerator pedal position as an input signal. The first level has a driver intention determination block for determining a quantity proportional to the desired longitudinal acceleration. The first level transmits this quantity as an input signal to a plausibility block of the second level. The plausibility block has at least one fault detection program, by which a fault can be detected when a defined correct relationship does not exist for a specified time period between the accelerator pedal position and/or the accelerator pedal position change with respect to the determined quantity proportional to the desired longitudinal acceleration—and this relationship is therefore implausible.

Claims12

Dependent claims

An arrangement for detecting faults in an electronically controlled drive system of a motor vehicle, comprising:

an electronic control unit for controlling a drive function of the motor vehicle, the electronic control unit having a first function-controlling level and a second monitoring level, wherein
both the first function-controlling level and second monitoring level of the electronic control unit acquire at least an accelerator pedal position as an input signal,
the first function-controlling level of the electronic control unit determines a quantity proportional to a desired longitudinal acceleration and transmits the determined quantity as an input signal to a plausibility block of the second level of the electronic control unit,
the plausibility block of the second level of the electronic control unit implements at least one fault detection program to detect a fault when a defined relationship is not satisfied between the accelerator pedal position and/or an accelerator pedal position change and the determined quantity proportional to the desired longitudinal acceleration,
when no fault is detected, the drive function is implemented, and
when a fault is detected, an emergency operation of the drive function is implemented by the electronic control unit, or the electronic control unit is switched off completely.

3 more elements

A method of detecting faults in a motor vehicle equipped with an electronic control unit provided with a first function-controlling level and a second monitoring level of the electronic control unit, the method comprising acts of:

receiving, in both the first function-controlling level and the second monitoring level of the electronic control unit, at least an accelerator pedal position of the motor vehicle as an input signal;
determining, in the first function-controlling level of the electronic control unit, a quantity proportional to a desired longitudinal acceleration;
transmitting the determined quantity as an input signal to a plausibility block of the second monitoring level of the electronic control unit;
detecting, by a fault detection program of the plausibility block of the second monitoring level of the electronic control unit, a fault when a defined relationship is not satisfied between the accelerator pedal position and/or an accelerator pedal position change and the determined quantity,
when no fault is detected, the drive function is implemented, and
when a fault is detected, an emergency operation of the drive function is implemented by the electronic control unit, or the electronic control unit is switched off completely.

3 more elements

Dependencies are inferred from the claim text.

Method and circuit arrangement in an electronic control unit of a motor vehicle for detecting faults

Life of this patent

Method and circuit arrangement in an electronic control unit of a motor vehicle for detecting faults

Life of this patent

Abstract

Claims12