Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating devices
  • B60H1/02—Heating, cooling or ventilating devices the heat being derived from the propulsion plant
  • B60H1/025—Heating, cooling or ventilating devices the heat being derived from the propulsion plant from both the cooling liquid and the exhaust gases of the propulsion plant

Definitions

• the present invention relates to an additional heating device of a motor vehicle.
• the heating device of the passenger compartment of motor vehicles most often comprises a heater, that is to say a liquid-air heat exchanger which is heated by the cooling liquid of the internal combustion engine.
• Some diesel-type engines have an exhaust gas recirculation circuit to the engine intake, which reduces the exhaust gas NOx level, that is, to reduce the pollution caused by these latter.
• This exhaust gas recirculation circuit is commonly called EGR circuit.
• the exhaust gas recycling circuit EGR comprises, in known manner, an exchanger 1 for cooling the exhaust gas.
• This exchanger 1 is cooled by the coolant 2 of the engine.
• the coolant 2 leaving this exchanger 1 flows in the heater heater, which contributes to the heating of the latter.
• the exhaust gas recycling circuit comprises, between the exchanger 1 and the intake 3 of the engine, a valve 4 for controlling the flow rate of the recycled exhaust gases towards the intake .
• This valve 4 is controlled by a computer 5 which favors the proper operation of the engine and the depollution.
• the cooling exchanger 1 of the exhaust gas recirculation EGR circuit is arranged in series with the heater heater.
• the valve 4 for controlling the flow of the exhaust gas recycled to the inlet 3 is located between the exhaust manifold
• This arrangement also contributes to heating the heater.
• the known devices do not make it possible to make an effective contribution to the heating of the heater, especially when the outside temperatures are low.
• the object of the present invention is to provide a solution to the problem mentioned above.
• the invention thus relates to an additional heating device of a motor vehicle comprising a heater that is heated by the coolant of the internal combustion engine of the vehicle, an exhaust gas recirculation circuit of the engine which comprises a exchanger for cooling the exhaust gas which is cooled by the engine coolant, this exchanger being connected in parallel with the circuit of the coolant which is connected to the heater, the exhaust gas recirculation circuit comprising a valve for controlling the flow of the recycled exhaust gas to the engine intake.
• this device is characterized in that the gas recycling circuit comprises a bypass of the exhaust gases to the exhaust manifold of the engine, this bypass comprising a valve for controlling the return of the exhaust gases to the exhaust.
• the device according to the invention thus comprises two valves, the first making it possible to control the flow of the exhaust gases towards the inlet, as in the case of known devices, and the second allowing the gases that have passed through the exchanger to return to the exhaust duct.
• Proper control of these two valves, by means of a computer, makes it possible to obtain a good compromise between the good operation of the engine, a good pollution control of the exhaust gases and the request for additional heating of the heater.
• valve for controlling the flow rate of the recycled exhaust gas to the inlet is disposed in the part of said recycle circuit between the exhaust heat exchanger and the intake of motor and said bypass is located between the exchanger and the exhaust manifold.
• valve for controlling the flow rate of the recycled exhaust gas to the inlet is disposed towards the part of said recycling circuit between the exhaust manifold and said heat exchanger and said bypass is also located between the exhaust manifold and said exchanger.
• the computer or computers intended to drive the two aforementioned valves are preferably programmed to drive these valves as follows: in case of need of depollution and additional heating: partial or total opening of the valve controlling the flow of exhaust gas to the engine intake and,. total opening of the valve controlling the return of exhaust gases to the exhaust, if only additional heating is required: total closure of the valve controlling the flow of the exhaust gas to the inlet,. total opening of the valve ensuring the return of the exhaust gases to the exhaust, in case of no need: closing of the two aforementioned valves.
• FIG. 1 is a diagram of a known EGR circuit
• FIG. 2 is a diagram of another known EGR circuit
• FIG. 3 is a diagram of a modified circuit EGR according to a first version of the invention
• Figure 4 is a diagram of a modified EGR circuit according to a second version of the invention
• Figure 5 is the overall diagram of the cooling device of an engine thermal, comprising a modified EGR circuit according to the invention.
• the modified exhaust gas recirculation EGR circuit comprises, as previously, an exchanger 1 for cooling the exhaust gas which is cooled by the coolant 2 of the engine.
• This exchanger 1 is connected in parallel with the coolant circuit which is connected to the heater heater.
• the exhaust gas recirculation circuit comprises a valve 4 for controlling the flow rate of the recycled exhaust gas to the inlet 3 of the engine.
• the gas recycling circuit comprises a bypass 7 of the exhaust gas to the exhaust manifold 6 of the engine.
• This bypass 7 comprises a valve 8 for controlling the return of the exhaust gas to the exhaust 6 of the engine.
• This valve 8 is, like the valve 4, controlled by a computer 5.
• valve 4 for controlling the flow rate of the recycled exhaust gases to the inlet 3 is disposed on the part of the recirculation circuit between said exchanger 1 and the inlet 3 of the engine, and the bypass 7 is located between the exchanger 1 and the exhaust manifold 6 of the engine.
• valve 4 for controlling the flow rate of the recycled exhaust gases to the inlet 3 is disposed on the part of the recycling circuit included between the exhaust manifold 6 and the exchanger 1 and the bypass 7 comprising the second valve 8 is located between the exhaust manifold 6 and the exchanger 1.
• the two valves 4 and 8 are also controlled by a computer 5.
• FIG. 5 shows in detail the cooling device of the engine 9 of a motor vehicle and the modified EGR circuit according to the invention.
• the exchanger 1 is connected with an inlet pipe 10 and an outlet pipe 11 of coolant.
• the inlet pipe 10 is connected to the water outlet housing 21 of the engine 9.
• the outlet pipe 11 of the coolant of the heat exchanger 1 of the EGR circuit and connected to the air heater heater 14 of the passenger compartment of the vehicle.
• the output of the heater 14 is itself connected by a pipe 15 to the radiator coolant outlet pipe 16 which sends this liquid into the engine 9 at 17.
• the reference 18 designates the expansion vessel of the cooling circuit.
• the cooled exhaust gases are sent, thanks to the valves 4, 8 driven by the computer 5: a) either to the intake manifold 3 via the pipe 20 and to the exhaust manifold 6 by the bypass line 7, the two valves 4 and 8 being open, b) either only to the exhaust manifold 6 via the pipe 20, the valve 4 being closed and the valve 8 open, c) either no gas circulates in the lines 20 and 7, the valves 4 and 8 being both closed.
• the simultaneous needs for depollution and additional heating of the heater 14 are met. These two needs can be distributed according to the situations, by more or less opening the valve 4 which regulates the flow of the gases towards the 'admission.
• the valve 8 may be a "on-off" type valve controlled conventionally with the same strategy as the immersion heaters and the PTC resistors (with a positive temperature coefficient).
• the exhaust gases serve only to heat the coolant which is sent in the exchanger 1 and then in the heater 14 to satisfy a heating need. In case c), no need is satisfied.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• Air-Conditioning For Vehicles (AREA)
• Exhaust-Gas Circulating Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=35709330

Family Applications (1)

Country Status (5)

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• 2005
  • 2005-06-09 FR FR0505858A patent/FR2886887B1/fr not_active Expired - Fee Related
• 2006
  • 2006-05-19 JP JP2008515258A patent/JP2008542627A/ja active Pending
  • 2006-05-19 US US11/917,066 patent/US20090194602A1/en not_active Abandoned
  • 2006-05-19 WO PCT/FR2006/050463 patent/WO2007000541A2/fr not_active Ceased
  • 2006-05-19 EP EP06794446A patent/EP1893430A2/de not_active Withdrawn

Non-Patent Citations (1)

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