FR2862575A1 - Hybrid power train controlling method for motor vehicle, involves comparing value of external temperature measured by temperature sensor with preset value, and controlling hybrid power train according to comparison result - Google Patents

Abstract

The method involves comparing a value of external temperature measured by a temperature sensor (1) with a preset value. A hybrid power train (9) is controlled according to the comparison result. Simultaneous operation of a heat engine (6) and an electric motor is controlled, when the measured value is lesser or equal to the preset value. The operation of the heat engine permits to heat a coolant that heats the cab interior. An independent claim is also included for a device for controlling hybrid power train of a motor vehicle.

Description

2862575 1

  The present invention relates to a method and a device for controlling a hybrid powertrain of a motor vehicle.

  The invention applies to hybrid vehicles comprising, for example, an electric traction motor powered by an on-board power supply battery and an internal combustion traction motor, that is to say vehicles using several sources. energy, in particular fuel and electrical energy stored in the battery.

  One of the major concerns of motor vehicle manufacturers is to develop vehicles with the lowest energy consumption and pollutant emissions possible. Hybrid vehicles, which offer several modes of operation, are able to use traction motors depending on the driving conditions of the vehicle, in order to limit energy consumption and pollutant emissions.

  Thus, for example, these vehicles are capable of operating either in an electric operating mode, in which the motive power is provided by an electric motor, or in a hybrid mode, in which the motive power is supplied by the electric motor. and by a heat engine, which then operate together, in adjustable proportions. A control system is provided to determine the operating mode to be used and to control the motors.

  JP-11245657 discloses a method of detecting the temperature of the heat transfer fluid temperature control circuit of the engine, and to start the engine if it is below a given temperature. This keeps the thermal engine at a hot operating temperature, limiting consumption and providing heating benefit when the driver needs it. This strategy is only intended to maintain the hot running of the engine. The temperature of the heat transfer fluid does not make it possible to estimate the temperature of the passenger compartment in a sufficiently precise manner, and therefore does not make it possible to anticipate the demand for heating or air conditioning of the passenger compartment by the driver.

  Patent JP-2001113940 discloses a controller linked to an air conditioning device which, depending on the temperature at the outlet of the evaporator of the air conditioning device, does or does not restart the engine to provide air conditioning of the passenger compartment. The temperature at the outlet of the evaporator does not make it possible to correctly estimate the temperature of the passenger compartment, and this strategy is only suitable if the air conditioning is in operation.

  The heat engine of a hybrid vehicle is generally started as soon as the vehicle is started, to bring the heat engine to a temperature sufficient to reduce its over-consumption in the cold, as well as to prime the catalyst of the catalytic device traversed by the exhaust gases. exhaust, and ensure the heating of the passenger compartment. But in many cases, the driver does not use heating or even air conditioning.

  Thus, in view of the foregoing, the object of the invention is to anticipate a request for heating of the passenger compartment by the driver. In the case of a vehicle equipped with an air conditioning device of the passenger compartment, the aim is also to anticipate a request for heating of the passenger compartment, and in addition a request for air conditioning of the passenger compartment.

  Also, according to the invention, there is provided a control method of a hybrid motor vehicle powertrain comprising a heat engine, an electric motor 2862575 3, a heater of the passenger compartment, and an electronic control unit . A first comparison is made of a value of the outside temperature measured by a temperature sensor and a first predetermined value, and the hybrid power unit is controlled according to the result of said first comparison.

  We can then anticipate a demand for heating the passenger compartment by the driver.

  In a preferred embodiment, when said measurement value of the outside temperature is less than or equal to said first predetermined value, it controls the simultaneous operation of the engine and the electric motor. The operation of the heat engine makes it possible to heat a heat transfer fluid that heats the passenger compartment of the vehicle by means of a heat exchanger of the heating device of the passenger compartment.

  In an advantageous embodiment, when said measurement value of the outside temperature is greater than the first predetermined value, it controls the operation of the electric motor and the stopping of the engine, the passenger compartment not requiring to be heated.

  In a preferred embodiment, the vehicle further comprising an air conditioning device of the passenger compartment, the value of the temperature of the passenger compartment is also estimated from the solar radiation measured by a sun sensor, and the hybrid power unit is controlled according to the result of said first comparison and a second comparison of the estimated value of the temperature of the passenger compartment and a second predetermined value.

  In an advantageous embodiment, when said measurement value of the outside temperature is greater than the first predetermined value and said estimated value of the temperature of the passenger compartment is lower than the second predetermined value, it controls the operation of the engine 2862575 4 and the shutdown of the engine, the cabin does not need to be heated or air conditioned.

  In a preferred embodiment, when said measurement value of the outside temperature is less than or equal to the first predetermined value or when said estimated value of the temperature of the passenger compartment is greater than or equal to the second predetermined value, controls the simultaneous operation of the engine and the electric motor. The operation of the heat engine makes it possible to heat a heat transfer fluid that heats the passenger compartment of the vehicle by means of a heat exchanger of the heating device of the passenger compartment, or to operate a compressor of the air conditioning device that air-conditioning the passenger compartment. .

  According to the invention, there is also provided a control device for a hybrid powertrain of a motor vehicle comprising a heat engine, an electric motor, a heater of the passenger compartment, and an electronic control unit. The device also comprises an external temperature sensor capable of transmitting a measurement value of the outside temperature to the electronic control unit which comprises processing means capable of making a first comparison of said measurement value of the outside temperature and of a first predetermined value. The processing means are furthermore capable of controlling the hybrid power unit according to the result of said first comparison.

  In a preferred embodiment, the vehicle comprising an air conditioning device of the passenger compartment, the device further comprises a sun sensor capable of transmitting a measurement value of solar radiation to the electronic control unit. The processing means are furthermore able to estimate the value of the temperature of the passenger compartment from the measured solar radiation, and to control the hybrid powertrain group according to the result of said first comparison, and a second comparing the estimated value of the cabin temperature and a second predetermined value.

  For example, the hybrid power train includes an integrated electric motor (ISG) to the vehicle gearbox.

  The hybrid power train may also include a separate electric motor (SSG) of the vehicle gearbox.

  The invention applies to any type of hybrid powertrain group.

  Other objects, features and advantages of the invention will become apparent on reading the following description, given solely by way of non-limiting example, and with reference to the appended drawings, in which: FIG. 1 illustrates a first embodiment of embodiment of a device according to the invention; FIG. 2 illustrates an implementation of the method according to the invention, with reference to the device of FIG. 1; FIG. 3 illustrates a first embodiment of a device according to the invention; FIG. 4 illustrates an implementation of the method according to the invention, with reference to the device of FIG. 3; FIG. 5 represents a first example of elements of a powertrain group to which the invention applies; FIG. 6 represents a second example of elements of a powertrain group to which the invention applies; FIG. 7 represents a third example of elements of a powertrain group to which the invention applies; FIG. 8 represents a fourth example of elements of a powertrain to which the invention is applied. 2862575 1, a temperature sensor 1 measuring the outside temperature is connected to a processing module 2 of the electronic control unit or ECU 3 by a connection 4. The temperature sensor 1 provides measurement values of the outside temperature. to the electronic control unit 3. The device is embedded on a vehicle equipped with a heating device of the passenger compartment. The processing module 2 is connected by a connection 5 to a heat engine 6, and by a connection 7 to an electric motor 8.

  The heat engine 6 and the electric motor 8 are part of a powertrain or GMP 9. The processing module 2 of the electronic control unit 3 can then control the operating mode of the heat engine 6 and the electric motor 8 A motor operating mode is understood to mean shutting down or stopping, or starting or keeping the engine running.

  FIG. 2 illustrates the operation of an embodiment of the method according to the invention by means of the device represented in FIG. 1.

  During a test step 10, the processing module 2 compares the value of a measurement of the outside temperature Text, carried out by the temperature sensor 1, with a first predetermined value Ti. It is estimated that above this predetermined first temperature value T1, the outside temperature is sufficiently high for the driver not to heat, especially when starting the vehicle. If the value of the outdoor temperature measurement Text is greater than the first predetermined value T1, in other words if the value of the outdoor temperature measurement Text is not less than or equal to the first predetermined value, then the process continues with a step 11.

  During step 11, the processing module 2 controls the operation of the electric motor 8 and stops or keeps it at a standstill of the heat engine 6. Indeed, the value of the measurement of the outside temperature is sufficiently high, since higher than the first predetermined value Tl, it is estimated that the driver does not intend to ask to heat the cabin. It is therefore not necessary to start, or keep running, the heat engine 6 so that the heat transfer fluid of the temperature control circuit of the engine 6 has a temperature sufficient to warm the cabin by means of a heat exchanger of the cabin heater.

  On the other hand, if in step 10 the value of the external temperature measurement Text is less than or equal to the first predetermined value T1, the process continues with a step 12.

  During step 12, the processing module 2 controls the simultaneous operation of the electric motor 8 and the heat engine 6. Indeed, the value of the outside temperature measurement Text is not sufficiently high, since it is less than or equal to at the first predetermined value Ti, it is estimated that the driver intends to ask to heat the passenger compartment. It is therefore necessary to start, or keep running, the heat engine 6 so that the heat transfer fluid of the temperature control circuit of the engine 6 has a temperature sufficient to warm the passenger compartment by means of a heat exchanger. heat of the cabin heater.

  FIG. 3 shows a device similar to that described in FIG. 1, to which is added a sun sensor 13 capable of supplying the treatment module 2 of the electronic control unit 3 with a measurement value of the radiation solar, by a connection 14. This device is embedded on a vehicle equipped with a heating device of the passenger compartment, and in addition to an air conditioning device of the passenger compartment. The processing module 2 controls the operating mode of the heat engine 6 and the electric motor 8.

  FIG. 4 illustrates the operation of an embodiment of the method according to the invention by means of the device represented in FIG. 3. During a test step 15, the processing module 2 compares the value of FIG. a measurement of the external temperature Text, carried out by the temperature sensor 1, at a first predetermined value T1, and compares the value of an estimate of the temperature of the passenger compartment Thab with a second predetermined value T2. The processing module 2 is then further able to evaluate a temperature of the passenger compartment Thab, from a measurement value of the outside temperature Text and a measurement value of the solar radiation. There are many algorithms, well known to those skilled in the art, to perform this calculation of the temperature of the cabin Thab, which will not be detailed later. It is estimated that above the first predetermined value Ti of temperature, the outside temperature is sufficiently high that the driver does not want to put heat, especially when starting the vehicle. In addition, it is estimated that if the temperature of the cabin Thab is lower than the second predetermined value T2, the driver does not want to put air conditioning. If the value of the external temperature measurement Text is greater than the first predetermined value T1, and if the estimated temperature of the passenger compartment Thab is lower than the second predetermined value T2, then the process continues with a step 16.

  In step 16, the processing module 2 controls the operation of the electric motor 8 and stops or keeps it stopped, the heat engine 6. Indeed, the value of the outside temperature measurement Text being sufficiently high, since higher than the first predetermined value Tl, it is estimated that the driver does not intend to ask to heat the cabin. In addition the estimated value of the temperature of the cabin Thab being low enough, since lower than the second predetermined value T2, it is estimated that the driver does not intend to ask to cool the cabin. Thus, in this step 16, it is not necessary to start or keep running the heat engine 6, so that the heat transfer fluid of the temperature control circuit of the engine 6 has a sufficient temperature to warm the cabin by means of a heat exchanger of the cabin heater, or so that the air conditioning device has enough energy to operate, including its pump.

  On the other hand, if in step 15, the value of the external temperature measurement Text is less than or equal to the first predetermined value Ti, or if the estimated temperature of the passenger compartment Thab is greater than or equal to the second predetermined value. T2, then the process continues with a step 17.

  In step 17, the processing module 2 controls the simultaneous operation of the electric motor 8 and the heat engine 6. In fact, either the value of the measurement of the outside temperature Text is not high enough, because lower or equal to the first predetermined value T1, the estimated value of the temperature of the passenger compartment Thab is sufficiently too high, because it is greater than or equal to the second predetermined value T2. It is then estimated that the driver has the intention to ask to warm the cabin or the intention to ask to cool the cabin. It is therefore necessary to start, or keep running, the engine 6 so that the heat transfer fluid of the temperature control circuit of the engine 6 has a temperature sufficient to warm the passenger compartment by means of a heat exchanger of the heating device of the passenger compartment, or so that the production of energy necessary for the operation of the air conditioning device is produced.

  Figures 5 and 6 describe two examples of possible architectures of elements of the hybrid drive group 9, in which the electric motor 8 is integrated with the gearbox 18 of the vehicle.

  FIG. 5 shows a starter alternator integrated in a clutch 19, in which a shaft 19a linked to the gearbox has the same axis as the shaft 19b linked to the heat engine 6.

  FIG. 6 represents an integrated starter alternator similar to that shown in FIG. 5, but comprising two clutches 19, 20.

  Figures 7 and 8 describe two examples of possible architectures of elements of the hybrid power unit 9, in which the electric motor 8 is separated from the gearbox 18 of the vehicle.

  Figure 7 shows a separate starter alternator with a clutch 21, which comprises a belt 23 driving two pulleys 24a and 24b in rotation. The pulley 24a is connected to a shaft 25 connected to the electric motor 8. The shaft 25 has an axis parallel to the axes 19a and 19b.

  FIG. 8 represents a separate starter alternator similar to that shown in FIG. 7, but comprising two clutches 21, 22.

  The invention thus makes it possible to anticipate requests, for heating and / or air conditioning of the passenger compartment of the vehicle, by the driver, in particular when starting the vehicle, and to control the operating mode of the hybrid powertrain unit of the vehicle. , in order to minimize the fuel consumption and polluting emissions of the vehicle.

Claims (2)

11 CLAIMS   1. A method of controlling a hybrid motor vehicle powertrain comprising a heat engine (6), an electric motor (8), a heater of the passenger compartment, and an electronic control unit (3), characterized in that a first comparison of a value of the outside temperature measured by a temperature sensor (1) and a first predetermined value is carried out, and the hybrid power unit (9) is controlled as a function of the result of said first comparison.   2. Method according to claim 1, characterized in that, when said measurement value of the outside temperature is less than or equal to said first predetermined value, it controls the simultaneous operation of the engine (6) and the electric motor (8). ), the operation of the heat engine (6) for heating a heat transfer fluid that heats the passenger compartment of the vehicle by means of a heat exchanger of the heating device of the passenger compartment.   3. Method according to claim 1 or 2, characterized in that, when said measurement value of the outside temperature is greater than the first predetermined value, the operation of the electric motor (8) and the shutdown of the engine are controlled. (6), the cockpit does not need to be heated.   4. Method according to claim 1, characterized in that, the vehicle further comprising an air conditioning device of the passenger compartment, it is further estimated the value of the cabin temperature from solar radiation measured by a sensor sunshine (13), and the hybrid power train (9) is controlled according to the result of said first comparison and a second comparison of the estimated 2862575 12 value of the temperature of the passenger compartment and a second predetermined value.   5. Method according to claim 4, characterized in that, when said measurement value of the outside temperature is greater than the first predetermined value and said estimated value of the temperature of the passenger compartment is less than the second predetermined value, controls the operation of the electric motor (8) and the stopping of the engine (6), the passenger compartment not needing to be heated or to be air conditioned.   6. Method according to claim 4 or 5, characterized in that, when said measurement value of the outside temperature is less than or equal to the first predetermined value or when said estimated value of the temperature of the passenger compartment is greater than or equal to at the second predetermined value, it controls the simultaneous operation of the 1 heat engine (6) and the electric motor (8), the operation of the heat engine (6) for heating a coolant that heats the passenger compartment of the vehicle by means of a heat exchanger of the heating device of the passenger compartment, or to operate a compressor of the air conditioning device which air-conditioning the passenger compartment.   7. Control device of a hybrid powertrain of a motor vehicle comprising a heat engine (6), an electric motor (8), a heater of the passenger compartment, and an electronic control unit (3) , characterized by the fact that it comprises an external temperature sensor (1) able to transmit a measurement value of the outside temperature to the electronic control unit (3) which comprises processing means (2) able to perform a first comparison of said measurement value of the outside temperature and a first predetermined value, and controlling the hybrid power plant (9) according to the result of said first comparison.   8. Device according to claim 7, characterized in that, the vehicle comprising an air conditioning device of the passenger compartment, the device further comprises a sun sensor (13) capable of transmitting a measurement value of the radiation. solar energy to the electronic control unit (3), and in that said processing means (2) are further able to estimate the value of the cabin temperature from the solar radiation measured, and to control the group hybrid propulsion motor (9) according to the result of said first comparison, and a second comparison of the estimated value of the temperature of the passenger compartment and a second predetermined value.   9. Device according to claim 7 or 8, characterized in that said hybrid powertrain (9) comprises an electric motor (8) integrated in the vehicle gearbox.   10. Device according to claim 7 or 8, characterized in that said hybrid powertrain (9) comprises an electric motor (8) separate from the vehicle gearbox.