Abstract: A circuit for processing a logic input, including a first comparator capable of comparing the logic input with a first reference voltage and of providing a logic output at a first output logic level if the logic input is higher than the first reference voltage and otherwise at a second output logic level different from the first output logic level. The power supply of the first comparator and the first voltage reference are activated by the logic input.

Abstract: A circuit for processing a logic input, including a first comparator capable of comparing the logic input with a first reference voltage and of providing a logic output at a first output logic level if the logic input is higher than the first reference voltage and otherwise at a second output logic level different from the first output logic level. The power supply of the first comparator and the first voltage reference are activated by the logic input.

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 device for diagnosing the loss of a connection to a ground (M) of an electronic control module (BCM) of a motor vehicle, noteworthy in that a first branch (B1) for connecting to the ground (M) includes: elements of unidirectional current conduction (Dd) mounted in parallel with a two-position switch (INT), the two-position switch (INT) being configured to toggle between a closed short-circuit position of the elements of unidirectional current conduction (Dd) and an open position of diagnostic of the loss of connection to the ground (M) of the electronic control module (BCM) on the first connecting branch (B1), and, elements for generating a current (Idiag) on the first connecting branch (B1).

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: The subject of the present invention is a device for diagnosing the loss of a connection to a ground (M) of an electronic control module (BCM) of a motor vehicle. This device (1) comprises a first branch (B1) connecting the electronic control module (BCM) to the ground(M), a second branch (B2) connecting the electronic control module (BCM) to the ground (M) adapted to receive power currents (I(power)) originating from power equipments (EQP) and comprising unidirectional current-conducting means (D), a diagnostic circuit (CD) connected to the second connecting branch (B2) at the level of a measurement point (PM) situated between the unidirectional current-conducting means (D) and the ground (M) and defining a voltage (Vdiag) for diagnosing a loss of connection to the ground (M) of the electronic control module (BCM) on the first branch connecting (B1).

Abstract: A device for keeping a computer of a motor vehicle in a standby mode and for switching over to an active mode, with at least one electrical switch connected so that a change of an initial state of the switch constitutes an event that triggers the switching of the computer, and an electrical circuit incorporating each electrical switch, and an electrical power supply designed to exhibit two states: a power supply conducting steady state of each electrical switch wherein no power is consumed, obtained in the absence of a signal on its control input or upon the reception of a control signal of logic level “0”, and a blocked state wherein power is consumed, obtained in the presence of a control signal of logic level “1” on its control input.

Abstract: A device for diagnosing the loss of a connection to a ground (M) of an electronic control module (BCM) of a motor vehicle, noteworthy in that a first branch (B1) for connecting to the ground (M) includes: elements of unidirectional current conduction (Dd) mounted in parallel with a two-position switch (INT), the two-position switch (INT) being configured to toggle between a closed short-circuit position of the elements of unidirectional current conduction (Dd) and an open position of diagnostic of the loss of connection to the ground (M) of the electronic control module (BCM) on the first connecting branch (B1), and, elements for generating a current (Idiag) on the first connecting branch (B1).

Abstract: A device for keeping a computer (1) of a motor vehicle in a standby mode and for switching over to an active mode, includes at least one electrical switch (2) connected in such a way that a change of initial state of the electrical switch constitutes the event triggering the switching over of the computer. This device further includes an electrical circuit (1a, 2, 3, 3a) incorporating each electrical switch, and an electrical power supply (3) designed to exhibit two states, a power supply conducting steady state of each electrical switch in which it does not generate power consumption, obtained in the absence of a signal on its control input (3b) or upon the reception of a control signal (Sc) of logic level “0”, and a blocked state in which it generates power consumption, obtained in the presence of a control signal of logic level “1” on its control input.

Abstract: A device (1) for diagnosing the loss of a connection to a ground (M) of an electronic control module (BCM) of a motor vehicle, includes a first branch (B1) connecting the electronic control module to the ground, a second branch (B2) connecting the electronic control module to the ground adapted to receive power currents originating from power equipments (EQP) and including unidirectional current-conducting elements (D), a diagnostic circuit (CD) connected to the second branch at the level of a measurement point (PM) situated between the unidirectional current-conducting elements and the ground and defining a voltage (Vdiag) for diagnosing a loss of connection to the ground (M) of the electronic control module on the first branch (B1). The second branch includes, between the measurement point of the diagnostic circuit and the ground, voltage-generating elements (Rs, Idiag) adapted to increase the diagnostic voltage in case of disconnection of the first branch.

Abstract: A method for protecting an electronic switch incorporated in an automotive vehicle in order to control the power supply of an electric load, the method including implementing a protection strategy, based on the use of a table of overload intensity values IS, intended to make it possible to detect and count the overshoots of the overload values IS, and to interrupt the operation of the electronic switch beyond a given number of overloads undergone. A table of overload intensities IS is established giving, for values of the power supply voltage that are greater than a predetermined voltage value VNbat, values IS=IT+?Ic, with ?Ic being identical for all the values, and for values of the power supply voltage that are less than or equal to VNbat, a constant value IS such that IS=IT(VNbat)+?Ic.

Abstract: A method for protecting an electronic switch incorporated in an automotive vehicle in order to control the power supply of an electric load, the method including implementing a protection strategy, based on the use of a table of overload intensity values IS, intended to make it possible to detect and count the overshoots of the overload values IS, and to interrupt the operation of the electronic switch beyond a given number of overloads undergone. A table of overload intensities IS is established giving, for values of the power supply voltage that are greater than a predetermined voltage value VNbat, values IS=IT+?Ic, with ?Ic being identical for all the values, and for values of the power supply voltage that are less than or equal to VNbat, a constant value IS such that IS=IT(VNbat)+?Ic.

Abstract: A process for diagnosing the proper operation of direction indicator lights of a motor vehicle includes the steps of temporally and alternately shifting the end of illumination of the right and left change of direction indicator lamps of the vehicle, measuring the current passing through a power circuit of the direction indicator lamps during the temporal shift, comparing the measured value with a reference value, and deducing therefrom whether at least one of the lamps is inoperative and in this case informing the driver thereof. A device for diagnosing the proper operation of the direction indicator lights of a motor vehicle is also provided.

Abstract: The present invention relates to a method of commanding the heating of a motor vehicle rear-view mirror, said vehicle being, in particular, equipped with an electrical device for commanding the movement of the windows, said method being characterized in that the device for commanding the lifting and lowering of one and the same window is used as a command to heat the rear-view mirror. The present invention also relates to a corresponding rearview mirror heating device.

Abstract: The present invention relates to a method for measuring temperature using a negative temperature coefficient sensor and a device employing a method of this type. The present invention applies more particularly to the field of automobile electronics. The temperature sensor is associated with a signal processing stage including at least one transistor connected in parallel with at least one "pull up" resistor. An analog/digital converter receives a voltage taken at a midpoint between the sensor and the "pull up" resistors.

Abstract: A method wherein (a) a voltage to be measured (U.sub.e) is amplified with a gain proportional to the ratio between the reference voltage (V.sub.ref) of an analogue-to-digital converter (3) and the extent of the voltage range; (b) the reference voltage (V.sub.ref) is amplified with a gain proportional to the ratio between the lower terminal (U.sub.1) of the voltage range and the extent of the voltage range; and (c) the analogue input of the converter (3) is supplied with the resulting amplified voltage difference. The method is useful for measuring a temperature by means of a thermocouple and measuring the temperature of an oxygen sensor in a motor vehicle exhaust line.