Abstract: The invention relates to a coupling device between a shaft (14) and a pulley (11) as well as to an engine block suitable for being installed in a motor vehicle. The shaft (14) and a pulley (11) can rotate relative to one another about an axis (15). According to the invention, the device includes a separate declutchable means (36, 37, 40, 42, 45, 50) for driving the shaft (14) by the pulley (11) only allowing the shaft (14) to be driven by the pulley (11) when the latter is rotating at a rotation speed that is higher than a predetermined rotation speed. The engine block includes a heat engine, a reversible alternator for starting the heat engine and generating electric power, an accessory, the heat engine and the reversible alternator being suitable for rotating the accessory by means of a belt. The engine block includes a coupling device according to the invention between an output shaft (14) of the heat engine and a pulley (11) driven by the belt (10).

Abstract: The invention relates to an internal combustion engine (1) that includes an inlet circuit (3) for oxidant air, an exhaust circuit (6), a compressor (4) having an input shaft (41), capable of increasing the air pressure in the inlet circuit when the input shaft thereof is rotated, an engine output shaft (21), a means for selective coupling (42) between the engine output shaft and the compressor input shaft, a Rankine cycle circuit (7) with an evaporator (71) in thermal contact with the exhaust circuit and provided with an expansion member (72) driven by the gas from the evaporator, characterised in that it further comprises a means for selective coupling (44) between the expansion member (72) and the input shaft (41) of the compressor.

Abstract: The invention relates to a method of heating a motor vehicle cabin by means of a circuit (20) for circulating a cooling fluid for cooling an engine (10) and including a pump (23), an air heater unit (22), and a heat exchanger (21) disposed in an exhaust system (15) that is also provided with a depollution assembly (16). The exhaust gas is directed towards the heat exchanger (21) or towards a bypass duct (18) downstream from the depollution assembly (16) as a function of engine operating conditions, of the outside temperature, of the heating temperature requested in the vehicle cabin, and of the temperature of the engine cooling fluid. The invention applies more particularly to direct injection diesel engines.

Abstract: The invention relates to a control device (D) which is intended to control the temperature of first and second fluids formed by the lubricating oil of the heat engine (12) of the vehicle and the recirculated exhaust gases respectively. The inventive device (D) comprises a first heat transfer liquid/lubricating oil exchanger (14) and a second heat-transfer liquid/recirculated exhaust gases exchanger (16), said first and second exchangers being connected to the same heat transfer liquid circuit (10). Preferably, the heat-transfer liquid circuit (10) is connected to a heat source or a heat sink (18) comprising, for example, heat storage means (18) which can exchange heat with the heat-transfer liquid.

Abstract: The invention relates to a device for thermal control of recirculated gases in an internal combustion engine, comprising a liquid coolant circuit (1), connected to an internal combustion engine (2). The circuit (1) comprises first thermal coolant/air heat exchanger means (3), such as a radiator, arranged in a first loop (13), connected to the engine (2), second thermal coolant/recirculated exhaust gas heat exchanger means (4) arranged in a second loop (14), connected in parallel to the first loop (13), in order to permit the supply of the second thermal heat exchanger means (4) with coolant from the first thermal heat exchanger means (3), characterized in that the ends of the second loop (14) are directly connected to the body of the first thermal exchanger means (3).

Abstract: The invention relates to a method of heating a motor vehicle cabin by means of a circuit (20) for circulating a cooling fluid for cooling an engine (10) and including a pump (23), an air heater unit (22), and a heat exchanger (21) disposed in an exhaust system (15) that is also provided with a depollution assembly (16). The exhaust gas is directed towards the heat exchanger (21) or towards a bypass duct (18) downstream from the depollution assembly (16) as a function of engine operating conditions, of the outside temperature, of the heating temperature requested in the vehicle cabin, and of the temperature of the engine cooling fluid. The invention applies more particularly to direct injection diesel engines.

Abstract: The invention relates to a control device (D) which is intended to control the temperature of first and second fluids formed by the lubricating oil of the heat engine (12) of the vehicle and the recirculated exhaust gases respectively. The inventive device (D) comprises a first heat transfer liquid/lubricating oil exchanger (14) and a second heat-transfer liquid/recirculated exhaust gases exchanger (16), said first and second exchangers being connected to the same heat transfer liquid circuit (10). Preferably, the heat-transfer liquid circuit (10) is connected to a heat source or a heat sink (18) comprising, for example, heat storage means (18) which can exchange heat with the heat-transfer liquid.

Abstract: A method for cooling a motor vehicle engine consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit provided with a degassing bypass hose equipped with an electronically controlled proportional actuator and with means forming direct return of fluid or bypass. The method comprises a step of determining the temperature of the cooling liquid, a step of comparing the temperature of the cooling liquid with a first and second threshold temperature, and a step of controlling the opening of the actuator such that, when the fluid temperature is between the first and the second threshold temperatures, the degree at which the actuator is opened is at least temporarily proportional to the cooling fluid temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: A method for cooling a motor vehicle engine which engine consists in regulating the volume and the flow rate of a coolant in a hydraulic circuit provided with a first bypass hose wherein is arranged a water/oil exchanger. The method comprises a first step of regulating the flow rate of the liquid in the first bypass hose to increase the speed of the increase in the temperature of the oil and a second step of regulating the flow rate of the liquid in the first bypass hose to maintain the temperature of the oil at about a reference temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: A method for cooling a motor vehicle engine consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit provided with a branch equipped with an electronically controlled actuator and means forming radiator. The method comprises a step of determining the temperature of the cooling liquid, a step of comparing the temperature of the cooling liquid with a specified threshold temperature from which the engine is said to be hot, and, when the temperature of the fluid is higher than the threshold temperature, the flow rate in the radiator branch is regulated so as to maintain the temperature of the cooling fluid around a specified setpoint value. The curve representing the opening of the thermostat valve based on the temperature of the cooling fluid exhibits an hysteresis around the setpoint temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: A method for cooling a motor vehicle engine consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit provided with a degassing bypass hose wherein is provided a degassing box. The method comprises a step of determining the temperature of the cooling liquid, a step of comparing the temperature of the cooling liquid with a first threshold temperature, and a step of regulating the fluid circulation in the degassing bypass hose such that, when the fluid temperature is higher than the first threshold, the amount of fluid circulating in the bypass hose is greater than the amount circulating in that same bypass hose when the fluid temperature is lower than the first threshold temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: A method for cooling a motor vehicle engine consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit provided with a degassing bypass hose equipped with an electronically controlled proportional actuator and with means forming direct return of fluid or bypass. The method comprises a step of determining the temperature of the cooling liquid, a step of comparing the temperature of the cooling liquid with a first and second threshold temperature, and a step of controlling the opening of the actuator such that, when the fluid temperature is between the first and the second threshold temperatures, the degree at which the actuator is opened is at least temporarily proportional to the cooling fluid temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: A method for cooling a motor vehicle engine consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit provided with a branch equipped with an electronically controlled actuator and means forming radiator. The method comprises a step of determining the temperature of the cooling liquid, a step of comparing the temperature of the cooling liquid with a specified threshold temperature from which the engine is said to be hot, and, when the temperature of the fluid is higher than the threshold temperature, the flow rate in the radiator branch is regulated so as to maintain the temperature of the cooling fluid around a specified setpoint value. The curve representing the opening of the thermostat valve based on the temperature of the cooling fluid exhibits an hysteresis around the setpoint temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: The invention concerns a method for cooling a motor vehicle engine, which consists in regulating the volume and the flow rate of a coolant fluid in a hydraulic circuit (2) provided with a degassing bypass hose (6) wherein is provided a degassing box (11). The invention is characterised in that the method comprises a step which consists in determining the temperature of the cooling liquid, a step which consists in comparing the temperature of the cooling liquid with a first threshold temperature, and a step which consists in regulating the fluid circulation in the degassing bypass hose (6) such that, when the fluid temperature is higher than the first threshold, the amount of fluid circulating in the bypass hose (6) is greater than the amount circulating in that same bypass hose (6) when the fluid temperature is lower than the first threshold temperature. The invention also concerns a device for cooling a motor vehicle engine.

Abstract: The invention concerns a method for cooling a motor vehicle engine which consists in regulating the volume and the flow rate of a coolant in a hydraulic circuit (2) provided with a first bypass hose (8) wherein is arranged a water/oil exchanger (13). The method comprises a first step which consists in regulating the liquid flow rate in the first bypass hose to increase the speed of the rise in the oil temperature. The invention is characterised in that it comprises a second step which consists in regulating the liquid flow rate in the first bypass hose to maintain the oil temperature at about a reference temperature. The invention also concerns a device for cooling a motor vehicle engine.