Abstract: A method for determining the phasing of the angular position of a four-stroke internal combustion engine with indirect injection and time-controlled sequential reinjection/sequential injection cutoff, characterized in that it includes, with the engine running, the following steps: observing the curve (3, 4) of engine speed (1) as a function of time (2) during a phase of sequential reinjection and/or sequential injection cutoff, performed in accordance with the expected oscillations of the transmission, discriminating, according to the shape of the curve (3, 4), a substantially linear shape (3) being indicative of correct phasing, whereas a substantially sinusoidal shape (4) is indicative of incorrect phasing.

Abstract: A method for determining the phasing of the angular position of a four-stroke internal combustion engine with indirect injection and time-controlled sequential reinjection/sequential injection cutoff, characterized in that it includes, with the engine running, the following steps: observing the curve (3, 4) of engine speed (1) as a function of time (2) during a phase of sequential reinjection and/or sequential injection cutoff, performed in accordance with the expected oscillations of the transmission, discriminating, according to the shape of the curve (3, 4), a substantially linear shape (3) being indicative of correct phasing, whereas a substantially sinusoidal shape (4) is indicative of incorrect phasing.

Abstract: A method for determining the exhaust pressure (Pr) of a turbocharged internal combustion engine, including a solenoid by-pass valve for the exhaust gas, characterized in that an exhaust pressure (Pi) is determined as a function of the inlet air flow to the engine, (Ar), the engine speed (Rr) and the degree of opening of the solenoid exhaust by-pass valve (Tr), by interpolation from a reference map having exhaust gas pressure values (Pc) for given inlet air flow values (Ac), the engine speed (Rc) and the degree of opening of the solenoid exhaust by-pass valve (Tc), and the exhaust pressure determined by the interpolation (Pi) is corrected as a function of ambient pressure values (Pa, Po).

Abstract: This method is intended for a turbocharged internal combustion engine having an electrically controlled throttle valve. The turbocharger has a waste gate for regulating its pressure. The position of the valve and the extent to which the gate is open are controlled according to two distinct modes of operation. In the first mode, the position of the valve is predetermined as a function of engine control and operating parameters, and the position of the gate is used to regulate the air flow rate. In the second mode, the extent to which the gate is open is predetermined as a function of engine control and operating parameters, and the position of the valve is used to regulate the air flow rate. Which mode is used is gauged by an electronic device which chooses the mode of operation to be implemented as a function of predetermined conditions stored in memory.

Abstract: A method for determining the exhaust pressure (Pr) of a turbocharged internal combustion engine, including a solenoid bypass valve for the exhaust gas, characterised in that an exhaust pressure (Pi) is determined as a function of the inlet air flow to the engine, (Ar), the engine speed (Rr) and the degree of opening of the solenoid exhaust by-pass valve (Tr), by interpolation from a reference map having exhaust gas pressure values (Pc) for given inlet air flow values (Ac), the engine speed (Rc) and the degree of opening of the solenoid exhaust bypass valve (Tc), and the exhaust pressure determined by the interpolation (Pi) is corrected as a function of ambient pressure values (Pa, Po)

Abstract: This method is intended for a turbocharged internal combustion engine having an electrically controlled throttle valve. The turbocharger has a waste gate for regulating its pressure. The position of the valve and the extent to which the gate is open are controlled according to two distinct modes of operation. In the first mode, the position of the valve is predetermined as a function of engine control and operating parameters, and the position of the gate is used to regulate the air flow rate. In the second mode, the extent to which the gate is open is predetermined as a function of engine control and operating parameters, and the position of the valve is used to regulate the air flow rate. Which mode is used is gauged by an electronic device which chooses the mode of operation to be implemented as a function of predetermined conditions stored in memory.

Abstract: A method for measuring the speed (V) of a vehicle (1) relative to the ground, of the type using the deviation in frequency associated with the Doppler effect between a transmitted wave (3) sent by radar (2) solidly connected to the vehicle and a reflected wave (4) reflected by the ground, characterized in that radar of the type allowing simultaneous measurement of the relative distance (D) and the relative speed (V) between the vehicle and the ground is used, and that the distance measurement is used to validate the speed measurement.