Abstract: A method for controlling an item of electrical equipment of a motor vehicle including a device for controlling the item of equipment including a microcontroller, which is configured to generate an AC electrical signal for controlling the item of equipment characterized by its duty cycle, and a driver interface that is characterized by a maximum operating temperature threshold beyond which the driver interface is inoperative. The method includes determining the internal temperature of the driver interface, comparing the determined internal temperature with a first predetermined warning threshold and decreasing the duty cycle of the electrical signal when the first warning threshold has been exceeded so as to limit the power of the electrical signal and thus to keep the internal temperature of the driver interface below its maximum operating temperature threshold.

Abstract: An interface device for a processing unit, allowing a plurality of circuits to be connected to a single input port of the processing unit, capable of acquiring a state value of a circuit of the plurality of circuits, when the circuit is biased, including a plurality, of the same cardinal number, of power sources, each power source being associated with a circuit of the plurality of circuits and capable of biasing same, a switch capable of selectively connecting a single circuit of the plurality of circuits to the associated power source, in such a way as to bias the circuit, and of connecting all of the other circuits to ground, the selection of the biased circuit being controlled by a set of at least one output port of the processing unit.

Abstract: A method for diagnosing a bias power supply for an acquisition system including a matrix-array interface device having conductive rows and columns, each row being connected to an input port and to a bias power supply, each column being selectively connected to ground by controlling an output port, and at each intersection either a circuit or a shunt, connected between the intersected row and the intersected column, including the following steps: controlling an output port so as to ground a shunt, reading the input port corresponding to the shunt, a low state indicating a normal presence of the power supply, a high state indicating an abnormal absence.

Abstract: A method for controlling an item of electrical equipment of a motor vehicle including a device for controlling the item of equipment including a microcontroller, which is configured to generate an AC electrical signal for controlling the item of equipment characterized by its duty cycle, and a driver interface that is characterized by a maximum operating temperature threshold beyond which the driver interface is inoperative. The method includes determining the internal temperature of the driver interface, comparing the determined internal temperature with a first predetermined warning threshold and decreasing the duty cycle of the electrical signal when the first warning threshold has been exceeded so as to limit the power of the electrical signal and thus to keep the internal temperature of the driver interface below its maximum operating temperature threshold.

Abstract: A method for managing the power supply of an electronic control unit during the engine starting phase of a motor vehicle, the electronic control unit including a microcontroller, wherein a command to start the engine indicating the start of the starting phase is detected; the frequency of operation of the microcontroller is reduced; this reduced frequency of operation of the microcontroller is maintained for as long as effective starting of the engine has not been acknowledged; and the frequency of operation of the microcontroller is re-established once effective starting of the engine has been acknowledged.

Abstract: An interface device for a processing unit, allowing a plurality of circuits to be connected to a single input port of the processing unit, capable of acquiring a state value of a circuit of the plurality of circuits, when the circuit is biased, including a plurality, of the same cardinal number, of power sources, each power source being associated with a circuit of the plurality of circuits and capable of biasing same, a switch capable of selectively connecting a single circuit of the plurality of circuits to the associated power source, in such a way as to bias the circuit, and of connecting all of the other circuits to ground, the selection of the biased circuit being controlled by a set of at least one output port of the processing unit.

Abstract: A method for diagnosing a bias power supply for an acquisition system including a matrix-array interface device having conductive rows and columns, each row being connected to an input port and to a bias power supply, each column being selectively connected to ground by controlling an output port, and at each intersection either a circuit or a shunt, connected between the intersected row and the intersected column, including the following steps: controlling an output port so as to ground a shunt, reading the input port corresponding to the shunt, a low state indicating a normal presence of the power supply, a high state indicating an abnormal absence.

Abstract: A method for diagnosing a ground fault of a start/stop unit of a motor vehicle and a start/stop system implementing the method. The method comprises, in a preliminary phase, providing a driver device with a ground that can be switched between two positions and connecting a ground output of a start/stop device to the switchable ground. When the vehicle is in operation, at the time of a start/stop instruction: reading a first value of the signal at the input of the reading circuit, then temporarily switching the switchable ground from a first position connected to a ground of the vehicle to a second position connected to a ground resistor; reading a second value of the signal received by the reading circuit when the ground is switched to the ground resistor, and comparing the two read values in order to diagnose a short-circuit to ground fault of the start/stop unit.

Abstract: A method for managing the power supply of an electronic control unit during the engine starting phase of a motor vehicle, the electronic control unit including a microcontroller, wherein a command to start the engine indicating the start of the starting phase is detected; the frequency of operation of the microcontroller is reduced; this reduced frequency of operation of the microcontroller is maintained for as long as effective starting of the engine has not been acknowledged; and the frequency of operation of the microcontroller is re-established once effective starting of the engine has been acknowledged.

Abstract: A method for acquiring signals such as signals representative of the state of contacts (C1-Cn) of a motor vehicle, on communication ports (P1-Pn), which can be configured either in input mode or in output mode, of an electronic unit (1), called a computer, of the motor vehicle, according to which method the signals are acquired periodically by the alternation of time intervals of acquisition of the signals with standby time intervals. This method consists in configuring each communication port (P1-Pn) in input mode during the acquisition time intervals, and in level 0 output mode during the standby time intervals.

Abstract: Disclosed is a method for diagnosing a ground fault of a start/stop unit of a motor vehicle. The method includes, in a preliminary phase, providing a driver device with a ground switchable between two positions and connecting a ground output of a start/stop device to the switchable ground; and when the vehicle is in operation, at the time of a start/stop instruction: reading a first value of the signal at the reading circuit input; then temporarily switching the switchable ground from a first position connected to a ground of the vehicle to a second position connected to a ground resistor; reading a second value of the signal received by the reading circuit when the ground is switched to the ground resistor; and comparing the two read values in order to diagnose a short-circuit to ground fault of the start/stop unit. Also disclosed is a start/stop system implementing the method.

Abstract: A method for reading the state of a plurality of contact variables (Var-1, Var-i, Var-n) of a motor vehicle by a read module (MOD) including a plurality of read ports (P1, Pi, Pn) connected by an electric circuit to the plurality of contact variables, each read port being configured to read the state of a contact variable, the read module being configured to order periodically the reading of the contact, a period including a read interval (Ton) and a sleep interval (Toff), includes a step of detecting a current (?i=1nIinj_i) injected via the electric circuit across at least one of the read ports during a sleep interval and a step of adapting the period in which the contact variables are read by the read module, such that the detected current (?i=1nIinj_i) injected during a sleep interval is consumed by the read module during the consecutive read interval.

Abstract: A method for acquiring signals such as signals representative of the state of contacts (C1-Cn) of a motor vehicle, on communication ports (P1-Pn), which can be configured either in input mode or in output mode, of an electronic unit (1), called a computer, of the motor vehicle, according to which method the signals are acquired periodically by the alternation of time intervals of acquisition of the signals with standby time intervals. This method consists in configuring each communication port (P1-Pn) in input mode during the acquisition time intervals, and in level 0 output mode during the standby time intervals.

Abstract: A method for reading the state of a plurality of contact variables (Var-1, Var-i, Var-n) of a motor vehicle by a read module (MOD) including a plurality of read ports (P1, Pi, Pn) connected by an electric circuit to the plurality of contact variables, each read port being configured to read the state of a contact variable, the read module being configured to order periodically the reading of the contact, a period including a read interval (Ton) and a sleep interval (Toff), includes a step of detecting a current (?i=1nIinj_i) injected via the electric circuit across at least one of the read ports during a sleep interval and a step of adapting the period in which the contact variables are read by the read module, such that the detected current (?i=1nIinj_i) injected during a sleep interval is consumed by the read module during the consecutive read interval.