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CN-224200718-U - Engine waste heat recovery system, engine, hybrid assembly and vehicle

CN224200718UCN 224200718 UCN224200718 UCN 224200718UCN-224200718-U

Abstract

The utility model discloses an engine waste heat recovery system, an engine, a hybrid assembly and a vehicle, wherein the engine waste heat recovery system comprises an exhaust pipe, a first exhaust pipe and a second exhaust pipe, wherein the exhaust pipe is suitable for being connected with an exhaust port of an engine body; the device comprises a catalytic converter, a bypass pipe, a heat reservoir and a heat storage medium, wherein the catalytic converter is connected in series on the exhaust pipe, the bypass pipe is suitable for being connected between an exhaust port and the catalytic converter, the heat reservoir is connected in series on the bypass pipe, and the heat reservoir is provided with a heat storage medium which is suitable for heat exchange with gas in the bypass pipe. According to the engine waste heat recovery system, the heat reservoir is arranged on the bypass pipe, so that the catalyst can be preheated during cold start of the vehicle, the time for the catalyst to reach the ignition temperature can be shortened, the pollutant emission during the cold start can be reduced, and the environment protection is facilitated.

Inventors

  • ZHENG JIAGENG
  • PAN SHIYI
  • ZHENG JUNLI
  • JIANG GUANGMEI
  • YANG ZHIKANG

Assignees

  • 比亚迪股份有限公司

Dates

Publication Date
20260505
Application Date
20250527

Claims (20)

  1. 1. An engine waste heat recovery system (1), characterized by comprising: an exhaust pipe (10), the exhaust pipe (10) being adapted to be connected with an exhaust port of an engine body (2); a catalyst (30), wherein the catalyst (30) is connected in series with the exhaust pipe (10); -a bypass pipe (40), the bypass pipe (40) being adapted to be connected between the exhaust port and the catalyst (30); -a heat reservoir (50), said heat reservoir (50) being connected in series on said bypass pipe (40), said heat reservoir (50) having a heat storage medium (52), said heat storage medium (52) being adapted to exchange heat with the gas inside said bypass pipe (40).
  2. 2. The engine waste heat recovery system (1) according to claim 1, further comprising a valve assembly (60), said valve assembly (60) being arranged on said exhaust pipe (10) and/or said bypass pipe (40) for controlling said exhaust port to switchably communicate with said catalyst (30) directly through the exhaust pipe (10) or with said catalyst (30) through said bypass pipe (40).
  3. 3. The engine waste heat recovery system (1) according to claim 2, wherein the valve assembly (60) comprises a first control valve (61), the first control valve (61) being used for controlling the switching of the exhaust pipe (10) or the bypass pipe (40).
  4. 4. An engine waste heat recovery system (1) according to claim 3, wherein the valve assembly (60) further comprises a second control valve (62), the first control valve (61) and the second control valve (62) being connected to the air inlet and outlet ends of the heat reservoir (50), respectively.
  5. 5. The engine waste heat recovery system (1) of claim 2, further comprising a first control member (63), the first control member (63) being electrically connected to the valve assembly (60).
  6. 6. The engine waste heat recovery system (1) of claim 5, wherein the valve assembly comprises a first control valve (61) and a second control valve (62), the first control valve (61) and the second control valve (62) are respectively connected to an intake end and an exhaust end of the heat reservoir (50), the first control member (63) is respectively electrically connected to the first control valve (61) and the second control valve (62) to control the first control valve (61) and the second control valve (62) to be synchronously opened and synchronously closed, the exhaust port is communicated with the catalyst (30) through the bypass pipe (40) when the first control valve (61) and the second control valve (62) are synchronously opened, and the exhaust port is directly communicated with the catalyst (30) through the exhaust pipe (10) when the first control valve (61) and the second control valve (62) are synchronously closed.
  7. 7. The engine waste heat recovery system (1) of claim 2, further comprising a first temperature sensor for detecting a temperature within the catalyst (30), the first temperature sensor being electrically connected to the valve assembly (60), the valve assembly (60) being configured to communicate the exhaust port to the catalyst (30) through the bypass pipe (40) when the detected temperature of the first temperature sensor reaches a first preset temperature, the first preset temperature being greater than a catalyst light-off temperature within the catalyst (30).
  8. 8. The engine waste heat recovery system (1) of claim 2, further comprising a second temperature sensor for detecting a temperature at the exhaust port, the second temperature sensor being electrically connected to the valve assembly (60), the valve assembly (60) being configured to communicate the exhaust port to the catalyst (30) through the bypass pipe (40) when a detected temperature of the second temperature sensor reaches a second preset temperature, the second preset temperature being greater than a catalyst light-off temperature within the catalyst (30).
  9. 9. The engine waste heat recovery system (1) according to claim 8, wherein the second preset temperature is greater than 600 ℃.
  10. 10. The engine waste heat recovery system (1) according to claim 2, further comprising a third temperature sensor for detecting a temperature in the heat reservoir (50), the third temperature sensor being electrically connected to the valve assembly (60), the valve assembly (60) being configured to directly communicate the exhaust port with the catalyst (30) through the exhaust pipe (10) when a detected temperature of the third temperature sensor reaches a third preset temperature, the third preset temperature being 600 ℃ or higher and 800 ℃ or lower.
  11. 11. The engine waste heat recovery system (1) according to any one of claims 1-10, wherein the heat reservoir (50) comprises a heat storage pipe (51), the heat storage pipe (51) comprises a heat insulation layer (511) and a heat conduction layer (512), the heat conduction layer (512) and the heat insulation layer (511) are both formed into a tubular shape, the heat insulation layer (511) is sleeved on the radial outer side of the heat conduction layer (512), a gas channel (513) connected in series with the bypass pipe (40) is defined in the heat conduction layer (512), and the heat storage medium (52) is filled between the heat conduction layer (512) and the heat insulation layer (511).
  12. 12. The engine waste heat recovery system (1) of claim 11, wherein the heat storage medium (52) comprises a microcapsule phase change material.
  13. 13. The engine waste heat recovery system (1) of claim 11, wherein the heat reservoir (50) further comprises a heat conducting member (53), the heat conducting member (53) being arranged within the gas passage (513), and the heat conducting member (53) being connected to the heat conducting layer (512) such that the heat conducting member (53) exchanges heat with the heat conducting layer (512).
  14. 14. The engine waste heat recovery system (1) according to claim 13, wherein the heat conducting member (53) is formed in a fin structure.
  15. 15. The engine waste heat recovery system (1) according to any one of claims 1 to 10, further comprising an air return pipe (71), one end of the air return pipe (71) being connected to an air outlet end of the catalyst (30), the other end of the air return pipe (71) being adapted to communicate with an air intake pipe (11) of the engine block (2).
  16. 16. The engine waste heat recovery system (1) of claim 15, further comprising an electric compressor (80), the electric compressor (80) comprising: the air compressor (81), the said air compressor (81) connects in series on the said air inlet pipe (11); -a turbine (82), said turbine (82) being connected in series to said exhaust pipe (10); -an electric motor (83), said electric motor (83) being connected between said compressor (81) and said turbine (82).
  17. 17. The engine waste heat recovery system (1) according to claim 16, characterized in that the turbine (82) is arranged upstream of the catalytic converter (30) in the direction of gas flow in the exhaust pipe (10), the bypass pipe (40) being connected between the turbine (82) and the catalytic converter (30).
  18. 18. The engine waste heat recovery system (1) according to claim 16, further comprising a cooler (72) and a third control valve (73), wherein the cooler (72) and the third control valve (73) are sequentially connected in series on the muffler (71), and an outlet end of the third control valve (73) is communicated with an inlet end of the compressor (81).
  19. 19. The engine waste heat recovery system (1) according to claim 15, further comprising an air filter (20), the air filter (20) being connected in series to the intake pipe (11).
  20. 20. An engine (100) comprising an engine block (2) and an engine waste heat recovery system (1) according to any one of claims 1-19, the engine block (2) having an exhaust port, the exhaust pipe (10) being connected to the exhaust port.

Description

Engine waste heat recovery system, engine, hybrid assembly and vehicle Technical Field The utility model relates to the technical field of engine exhaust gas recirculation systems, in particular to an engine waste heat recovery system, an engine, a hybrid assembly and a vehicle. Background In the related art, the amounts of CO, HC and NOx emitted from automobile exhaust are counted to be 20% -50% of the total amount of these pollutants in the atmosphere, and the problem of cold start emission pollution is an important aspect of automobile exhaust emission pollution, one of the reasons is that the temperature of the cooling liquid is low and the fuel is not combusted sufficiently in the cold start stage, and at this time, the engine exhaust temperature is low, and the oxygen sensor and the three-way catalyst cannot be operated quickly, so that the emission amount of pollutants is increased, and the environmental pollution is increased. Disclosure of utility model The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the present utility model is directed to an engine exhaust heat recovery system that can shorten the time for a catalyst to reach a light-off temperature, so that the amount of pollutant emissions during cold start can be reduced, contributing to environmental protection. The utility model also provides an engine with the engine waste heat recovery system. The utility model further provides a hybrid assembly with the engine. The utility model also provides a vehicle with the hybrid assembly or the engine. The engine waste heat recovery system comprises an exhaust pipe, a catalyst, a bypass pipe and a heat storage device, wherein the exhaust pipe is suitable for being connected with an exhaust port of an engine body, the catalyst is connected in series with the exhaust pipe, the bypass pipe is suitable for being connected between the exhaust port and the catalyst, the heat storage device is connected in series with the bypass pipe, and the heat storage device is provided with a heat storage medium and is suitable for exchanging heat with gas in the bypass pipe. According to the engine waste heat recovery system, the heat reservoir is arranged on the bypass pipe, so that the catalyst can be preheated during cold start of the vehicle, the time for the catalyst to reach the ignition temperature can be shortened, the pollutant emission during the cold start can be reduced, and the environment protection is facilitated. According to some embodiments of the utility model, the engine waste heat recovery system further comprises a valve assembly arranged on the exhaust pipe and/or the bypass pipe for controlling the exhaust port to switchably communicate with the catalyst directly through the exhaust pipe or through the bypass pipe. According to some embodiments of the utility model, the valve assembly comprises a first control valve for controlling the on-off of the exhaust pipe or the bypass pipe. According to some embodiments of the utility model, the valve assembly comprises a second control valve, the first control valve and the second control valve being connected to an air inlet end and an air outlet end of the heat reservoir, respectively. According to some embodiments of the utility model, the engine waste heat recovery system further comprises a first control member electrically connected to the valve assembly. According to some embodiments of the utility model, the valve assembly comprises a first control valve and a second control valve, the first control valve and the second control valve are respectively connected with an air inlet end and an air outlet end of the heat reservoir, the first control piece is respectively electrically connected with the first control valve and the second control valve so as to control the first control valve and the second control valve to synchronously open and synchronously close, when the first control valve and the second control valve synchronously open, the exhaust port is communicated with the catalyst through the bypass pipe, and when the first control valve and the second control valve synchronously close, the exhaust port is directly communicated with the catalyst through the exhaust pipe. According to some embodiments of the utility model, the engine waste heat recovery system further comprises a first temperature sensor for detecting the temperature in the catalyst, the first temperature sensor is electrically connected with the valve assembly, and the valve assembly is configured to enable the exhaust port to be communicated with the catalyst through the bypass pipe when the detected temperature of the first temperature sensor reaches a first preset temperature, and the first preset temperature is larger than the catalyst light-off temperature in the catalyst. According to some embodiments of the utility model, the engine waste heat recovery system further comprises a second temperature