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CN-114286771-B - Protection method for protecting clutch of hybrid vehicle from overheat

CN114286771BCN 114286771 BCN114286771 BCN 114286771BCN-114286771-B

Abstract

The invention relates to a clutch (4) for protecting a hybrid vehicle comprising a heat engine (2) providing a heat engine torque and a traction or assistance torque, respectively, and at least one other power source (10, 18), a virtual limit of the heat engine being set, above which limit an analysis and control means requires that the other power source (10, 18) at least partially operate in engine mode. The virtual limitation takes into account at least one actual temperature of the clutch and a rotational speed deviation between the crankshaft and the drive shaft, a maximum temperature of the clutch (4) being predetermined, a transition of at least partially converting the at least one other power source (10, 18) into an engine mode being performed at least when a detected temperature of the clutch is higher than the maximum temperature, thereby reducing the torque of the heat engine.

Inventors

  • Y rice about
  • HABBANI RIDOUAN
  • ROCQ GAETAN
  • F. Sirodo

Assignees

  • 标致雪铁龙汽车股份有限公司

Dates

Publication Date
20260508
Application Date
20200728
Priority Date
20190830

Claims (10)

  1. 1. A protection method for a clutch (4) of a hybrid vehicle comprising a heat engine (2), at least one other power source comprising an energy storage (12), a clutch (4) coupling at least the heat engine with at least one wheel drive axle of the vehicle, the at least one other power source having two actuation modes, comprising an engine mode in which the at least one other power source provides energy for sending traction or assistance torque to the heat engine (2), and a generator mode in which the at least one other power source stores energy provided by the heat engine (2) via the energy storage (12), the heat engine (2) and the at least one other power source provide heat engine torque and traction or assistance torque, respectively, for responding to an instantaneous power demand on the part of the driver, an analysis and control part, the analysis and control part being adapted to control the heat engine (2) and the at least one other power source in a virtual power demand on the part of the driver's demand, the analysis and the at least one other power source being limited by the virtual power demand on the part, so that if traction or assistance torque is required or desired in response to driver's wishes, said analysis and control means cause said at least one other power source to be at least partially converted into engine mode at a moment in response to said instantaneous power demand, characterized in that said virtual limitation takes into account at least one actual temperature of said clutch (4) and a rotational speed deviation between a crankshaft associated with said heat engine and said at least one drive shaft, a maximum temperature of said clutch (4) being predetermined, said maximum temperature of said clutch (4) being executed at least when a detected temperature of said clutch (4) is higher than said maximum temperature of said clutch (4) and there is a rotational speed deviation between upstream and downstream of said clutch (4), so as to reduce the torque transmitted by said clutch (4) and thus the torque provided by said heat engine (2).
  2. 2. The protection method according to claim 1, wherein the at least one further power source is at least partially gradually converted into engine mode is performed according to a predetermined minimum temperature below 50% of the maximum temperature.
  3. 3. Protection method according to claim 2, wherein the analysis and control means first require that the heat engine does not supply the energy storage (12) when the detected temperature of the clutch (4) is higher than the minimum temperature of the clutch (4) before at least partly converting the at least one other power source into engine mode.
  4. 4. A protection method according to claim 2 or 3, wherein the virtual limitation also takes into account two charging thresholds of the energy store (12), which are predefined in the analysis and control means, one of which is defined as a priority charging threshold and the other as an offloadable charging threshold, which is lower than the offloadable charging threshold, the analysis and control means reducing or eliminating at least a partial conversion of the at least one other power source and keeping the heat engine (2) in operation when the analysis and control means determine that the charging level of the energy store (12) is lower than the priority charging threshold and the detected temperature of the clutch (4) is higher than the minimum temperature.
  5. 5. A protection method according to any one of claims 1 to 3, wherein the at least one other power source includes at least two other power sources respectively coupled with the drive shaft, a first power source of the at least two other power sources being converted in preference to the at least one second power source.
  6. 6. The protection method according to claim 5, wherein, after the preferential conversion of the first power source, the at least one second power source is also converted when the detected temperature is kept higher than the maximum temperature of the clutch (4).
  7. 7. An assembly of a heat engine (2), at least one other power source comprising an energy storage (12), a clutch (4) coupling at least the heat engine (2) with at least one wheel drive shaft of the vehicle, and analysis and control means, characterized in that the assembly implements a protection method for protecting the clutch (4) of a hybrid vehicle according to any one of claims 1 to 6.
  8. 8. The assembly of claim 7, wherein the at least one other power source is an electric motor and the energy storage (12) is at least one battery.
  9. 9. A hybrid motor vehicle, characterized in that it comprises an assembly according to claim 7 or 8.
  10. 10. Hybrid motor vehicle according to claim 9, which is a vehicle with four powered wheels and has a front drive shaft coupled with a front motor (10) and a rear drive shaft coupled with a rear motor (18), the analysis and control means having switching means of the front motor (10) which are preferential with respect to the switching means of the rear motor (18).

Description

Protection method for protecting clutch of hybrid vehicle from overheat The present invention claims priority from French application 1909565 filed on 8/30 of 2019, the contents of which (text, drawings and claims) are incorporated herein by reference. Technical Field The invention relates to a method for protecting a clutch of a hybrid vehicle, comprising a heat engine, at least one other power source comprising an energy store, and a clutch coupling at least the heat engine with at least one wheel drive shaft of the vehicle, the clutch being protected from overheating. Background Hybrid vehicles are known in the art to include a heat engine, at least one other power source including an energy storage, and a clutch coupling at least the heat engine with at least one wheel drive shaft of the vehicle. In this configuration, one or more other power sources have two modes of actuation, an engine mode in which the power sources provide energy to send traction or assistance torque to the heat engine, and a generator mode in which the power sources store energy provided by the heat engine via an energy storage. The heat engine and one or more other power sources provide heat engine torque and traction or assist torque, respectively, for responding to instantaneous power demands on the vehicle operator. Analysis and control means adapted to control the heat engine and one or more other power sources are also provided. The virtual limit of the heat engine is set by the analysis component. Above the virtual limit, the analysis and control component requires one or more other power sources to operate at least in part in an engine mode. The instantaneous power demand on the driver side is prioritized such that if traction or assistance torque is needed or desired in response to the intent, the analysis and control component causes the one or more other power sources to at least partially transition to engine mode at the moment in response to the instantaneous power demand. The one or more power sources operable as generators may be disposed between the clutch and the wheels of the hybrid vehicle or directly on the wheels. In some use cases, it is desirable to use a clutch. The clutch heats up during slip, and the energy dissipated in the slipping clutch is equal to the integral of the power dissipated between the crankshaft and the wheel drive shaft, which can be calculated from the product of the rotational speed deviations upstream and downstream of the clutch and the torque transmittable by the clutch. In the case of steep grades or heavy vehicle weights (e.g. traction motor vehicles), or when a large torque is required by the vehicle driver, the heating of the clutch is very high and its cooling system is small. The invention is therefore based on the problem of avoiding heating the clutch during driving use of the vehicle for a hybrid vehicle comprising at least one non-thermal power source and a heat engine connected to at least one drive shaft via the clutch. Disclosure of Invention To this end, the invention relates to a protection method for a clutch of a hybrid vehicle comprising a heat engine, at least one other power source comprising an energy storage, a clutch coupling at least the heat engine with at least one wheel drive axle of the vehicle, the at least one other power source having two actuation modes, comprising an engine mode in which the at least one other power source provides energy for transmitting traction or assistance torque to the heat engine, and a generator mode in which the at least one other power source stores energy provided by the heat engine via the energy storage, the heat engine and the at least one other power source providing a heat engine torque and a traction or assistance torque, respectively, for responding to an instantaneous power demand on the part of the driver, an analysing and controlling means adapted to control the heat engine and the at least one power source, the analysing and controlling means being adapted to control the power engine in response to at least one part of the instantaneous power demand, the analysing and the power demand being set to a desired part of the at least one power demand, the analysing and the at least one other power source being in response to an instantaneous power demand, the at least one of the power demand being controlled part of the power demand being in order to analyse and the driver's wish to be in response to the instantaneous power demand, wherein the virtual limitation takes into account at least one actual temperature of the clutch and a rotational speed deviation between a crankshaft associated with the heat engine and the at least one drive shaft, a maximum temperature of the clutch being predetermined, the at least one further power source being at least partly converted into an engine mode being executed at least when a detected temperature of the clutch is higher than the maximum temperature of the clutch and there is a