Patent ID: 9690643
Date: 2017-06-27
CPC Classifications: G01R,G05B,G05F,G06F,H03K

Claim:
1. An engine-control computer comprising switches wherein switch voltage type outputs are configured to control some actuators, the computer further comprising a device for detecting internal or external failures with respect to the computer, the device comprising: a circuit for acquisition of an input voltage of such a switch; a circuit for acquisition of an output voltage of the switch; an electrical monitoring circuit wherein first and second inputs are connected respectively to outputs of each of the two circuits, which tests the input and output voltage level of the switch, and delivers an invalid status if the input or output voltage of the switch is less than a defined threshold voltage; and a circuit for acquisition of current flowing in the switch, wherein the electrical monitoring circuit includes a third input connected to an output of the circuit for acquisition of the current flowing in the switch, tests a current level and delivers an invalid status if the current is less than a defined limit current and is configured to detect an external failure with respect to the computer, and wherein the device further comprises: a discrete state monitoring circuit, wherein an input is connected to the output of the circuit for acquisition of the current flowing in the switch, the discrete state monitoring circuit being configured to determine a state of the switch based on a current level of the current flowing in the switch; and a deviation monitoring circuit, wherein one input receives an output signal of the discrete state monitoring circuit representative of the state of the switch, and wherein another input receives a discrete request signal representative of a required set-point of the switch, the deviation monitoring circuit being configured to test whether the state of the switch corresponds to the required set-point.