Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/14—Introducing closed-loop corrections
  • F02D41/1497—With detection of the mechanical response of the engine
  • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
  • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
  • F02D41/2409—Addressing techniques specially adapted therefor
  • F02D41/2422—Selective use of one or more tables

Definitions

• the present invention relates to a device for controlling a powerplant capable of delivering torque reference signals to be applied to the wheels of a motor vehicle, and an associated method.
• the invention relates more particularly to a device for controlling a power train, which can be adapted to any type of motor vehicle and making it possible to control the variations in the engine speed of said group in order to improve the acoustics felt by the driver. and passengers in the motor vehicle.
• a device for controlling a power train which can be adapted to any type of motor vehicle and making it possible to control the variations in the engine speed of said group in order to improve the acoustics felt by the driver. and passengers in the motor vehicle.
• it is sought to reduce as much as possible the noise nuisance caused by the power train of the motor vehicle.
• the applicant has developed a device for controlling the operating point of a motor-propulsion unit for motor vehicles, described in document FR-A-2 827 339.
• the control carried out by this device is a torque control applied to the wheels of the motor vehicle.
• the value of the torque to be applied to the wheels of the motor vehicle is calculated directly at the wheels of the motor vehicle.
• Such a device is equipped with a module for interpreting the driver's wishes, known as the IVC module, comprising in particular a generator making it possible to generate a signal representative of an imitation of variation of the speed of the powertrain capable of reducing the acoustic variations of the powertrain that the driver is likely to hear.
• Said signal is transmitted to an optimization block of the powertrain for the purpose of controlling the torque to be applied to the wheels of the vehicle, the optimization block allowing the determination of an operating point in an optimal operating range. of the powertrain on the basis of driving pleasure constraint.
• the determination of the signal representative of a limitation of the engine speed of the power train capable of reducing the acoustically annoying variations of the power train is carried out as a function of the degree of activity of the driver and of the speed of the motor vehicle.
• a te! device capable of improving the acousti that felt by people within the passenger compartment, has the drawback of not allowing to correctly take into account the variations in torque demand to be applied to the wheels, the signal being determined mainly by the speed of the motor vehicle.
• the object of the present invention is therefore to resolve this drawback and to provide a control device for a powerplant which can take into account in a particularly precise manner the variations in torque demand, and therefore indirectly of the regime. of the powertrain, making it possible to determine suitable limitations of the powertrain.
• the control device of a motor vehicle power unit capable of delivering torque setpoint signals to be applied to the wheels of the motor vehicle comprises means for generating a signal representative of a limitation of variation of the engine speed integrated in the powertrain capable of reducing annoying variations from an acoustic point of view of said group, and a means of determining an operating point of the powertrain in a optimal operating range of the powertrain as a function of the representative speed limitation signal.
• the means for generating the signal representative of a variation limitation of the speed of the heat engine integrated in the powerplant is supplied with input by parameters representative of the characteristics of the motor vehicle and parameters representative of the driver's wishes.
• the torque setpoint to be applied to the wheels is calculated directly at the wheels of the motor vehicle.
• the device makes it possible, also, to have an acoustics of the powertrain dependent not only on the speed of the motor vehicle, but also on the will of the driver. In other words, the device makes it possible to take into account variations in the position of the accelerator pedal in order to generate engine speed limits for the engine, in addition to acceleration or vehicle deceleration.
• the parameters representative of the characteristics of the motor vehicle can comprise a parameter representative of the estimated or measured degree of activity of the driver Acond, and a parameter representative of the speed of the motor vehicle Vveh.
• the parameters representative of the driver's will include parameters representative of the position of the Pedacc accelerator pedal and parameters representative of the position of the Pedokon brake pedal.
• the parameters representative of the will of the driver include, in addition, a parameter representative of the gradient of the position of the accelerator pedal Pedacc ⁇ grd.
• the parameter representing the gradient of the position of the accelerator pedal Pedacc_grd has been filtered by a filtering means and / or timed by a delaying means before the supply of the generation means by said parameter Pedacc_grd.
• the invention also relates to a method for controlling a motor-propulsion unit of a motor vehicle capable of delivering torque setpoint signals to be applied to the wheels of the motor vehicle, in which a signal representative of a limitation of the engine speed is generated.
• a point of operation of the powertrain is determined in an optimal operating range of the powertrain in function of the representative speed limitation signal.
• Generating said signal representative of a limitation of variation of the speed of the internal combustion engine powertrain based on input parameters representative of the characteristics of the motor vehicle and parameters representative of the driver's wishes.
• a limitation of the speed of the thermal engine integrated in the powertrain is generated as a function of the depressing of the Pedacc accelerator pedal. Said limitation can also be generated as a function of the application of the vehicle brake and / or as a function of the gradient of the position of the accelerator pedal Pacc_grd.
• the limitation of the speed of the thermal engine integrated in the powertrain comprises at least one of the following steps: - the depression of the accelerator pedal is compared to a first position threshold predetermined corresponding to a depressing state beyond the hard point of the accelerator pedal, - the depressing of the accelerating pedal is compared to a second predetermined position threshold corresponding to a significant depressing state of the pedal but less than the first threshold, - the depression of the acceleration pedal is compared to a third predetermined position threshold corresponding to a state of depression of the pedal less than the second threshold, - the gradient of the depression is compared from the acceleration pedal to a fourth predetermined position variation threshold corresponding to rapid depressing of said pedal, - the gradient of enf oncing the accelerator pedal to a fifth predetermined position variation threshold corresponding to a rapid raising of said pedal, each step determining a limitation of the engine speed between operating limit values or authorizing the next step according to the value of the parameters.
• FIG. 1 is a block diagram of a control device according to the present invention
• FIG. 2 is a block diagram of a means for generating a signal of the control device of Figure 1
• - Figure 3 schematically illustrates the different stages of operation of a generation means of Figure 2.
• a control device comprising a means of interpretation 1 of the will of the driver, a means 2 for determining an operating point in an optimal operating range of a motorcycle group propellant 3 and an embodiment 4 of the determined operating point.
• the means 1 is connected to three input modules 5, 6 and 7, respectively via connections 8, 9 and 10, capable of producing a signal representative of a quantity measured by sensors
• Module 5 provides the characteristics of the vehicle, in particular the behavior profiles of the vehicle programmed by the manufacturer to characterize the behavior of the vehicle delivered to a customer.
• the module 6 is capable of processing data by performing the interface between the human driver and the rest of the motor vehicle according to the technique of man / machine interfaces.
• the module 7 is capable of producing signals relating to the environment of the motor vehicle. These allow to take into account the state of the motor vehicle and its situation in the environment, for example the speed of the motor vehicle, road conditions or weather conditions.
• the value of the parameters and the state of the variables of the input data transmitted by these three modules can be stored in a memory common to each element of the device.
• the means 1 comprises a generator 1 1 of torque setpoint to be applied to the wheels comprising a static component, called the static torque Cs, and a torque setpoint generator 12 to be applied to the wheels comprising a dynamic component, called the dynamic torque
• the means 1 also comprises a means of generation 13 for limiting the variation in speed of the engine of the group motor-propellant capable of generating two signals of limitation sign 21, 22, said positive speed limit lim_var_rpm_pos to limit the variations in speed towards the direction of increase, and negative speed limit lim_var_rpm_neg to limit the variations in speed motor in the direction of reduction.
• the speed variation limitation defines the variation of engine speed during a determined time interval.
• the generation means 13 receives as input data representative of the driver's wishes as well as data representative of the characteristics of the motor vehicle. Data representative of the driver's wishes, transmitted respectively by connections 14, 15a, 16 and
• - Pedacc the information representative of the depressing state of the accelerator pedal of the vehicle, by means of a sensor (not shown)
• - Pedacc _grd the gradient of the position of the accelerator pedal from the depressing state of the accelerator pedal compared to a previous depressing state, said gradient being calculated by means of a specific operator (not shown) calculating a derivative of successive positions of the accelerator pedal
• - Kick depressing the accelerator pedal beyond a physical stop called also the hard point of the accelerator, in particular allow, on an automatic transmission of the conventional type with discrete ratios, to force the downshift to the lower ratio in order to obtain a momentary additional acceleration which may be necessary for example when overtaking
• - Pedokok representative information the depressed state of the vehicle brake pedal, by means of a sensor (not shown).
• the data representative of the gradient of the accelerator pedal can advantageously be filtered by a filtering means 20, such as a filter, before being transmitted by the connection 15b to the generation means 13 in order to suppress any noise.
• a filtering means 20 such as a filter
• a time delay means capable of storing a maximum value of the gradient of the position of the pedal during a given time interval to transmit it to the generation means 13.
• Data representative of the characteristics of the vehicle automobile, transmitted respectively by connections 1 S and 19 are: - Acond: the degree of driver activity (in%) estimated or measured, which can be read in the memory recording the driver activity, - Vveh: the vehicle speed (in km / h), which can be read or interpreted on the memories or state variables representing signals representing the vehicle speed.
• the generation means 13 makes it possible to determine the limitation of variation in speed in order to improve the acoustics within the passenger compartment of the motor vehicle, by transmitting the setpoint signals for limiting variations in speed towards the direction of increase lim_var_rpm_pos and speed limitation towards the direction of reduction lim_yar_rpm_neg, respectively by the connecti ons 21 and 22, by means of determination 2 of the operating point of the powertrain.
• the flowchart represented in FIG. 3 shows the various analysis and comparison tests carried out on the data transmitted by the connections 14 to 19 (FIG. 2). These tests are carried out by different comparison means, for example comparators, according to the following process.
• a first step 23 consists in determining whether the accelerator pedal is depressed beyond a first threshold, i ci beyond the hard point of the accelerator called kick. If the depressing of the accelerator pedal PedAcc is greater than the depressing corresponding to the hard kick point then the generation means 13 chooses a first mode 24 in which the variable lim_var_rpm_pos takes the cal ibrable value Ni_grd_max and the variable lim_var_rpm_neg takes the cal ibrabl e Ni__grd_min value, where Ni represents a speed setpoint for the internal combustion engine integrated in the powertrain 3 (figure 1), predetermined in order to obtain a limitation of the operating point allowing the maximum performance of the said group to be reached powerplant 3 while having improved acoustics for people inside the passenger compartment of the motor vehicle.
• the generation means 13 goes to step 25 and checks if the depressing of the accelerator pedal Pedacc is greater than one second threshold threshold_PedaccF corresponding to a depressing of the accelerator pedal close to 100%, which may for example be 95%.
• the generation means 13 passes to a second mode 26 in which the variable lim_var_rpm_pos is calculated from a calibratable map p _P 'edaccF and the variable lim_var_rpm_neg is calculated from a calibratable map n_ PedaccF.
• the variable lim_var_rpm_pos is calculated from a calibratable map p _P 'edaccF
• the variable lim_var_rpm_neg is calculated from a calibratable map n_ PedaccF.
• the generation means 1 3 goes to step 27 and checks whether the depressing of the accelerator pedal Pedacc is less than a third threshold threshold_PedaccL corresponding to depressing the accelerator pedal close to 0%, which may for example be 10%.
• the depressing of the acceleration pedal of the motor vehicle is strictly lower than the predetermined threshold for depressing the acceleration pedal (Pedacc ⁇ threshold_Pedacc) while the generation means 13 pass to a third mode 28 in which the variable e lim_var_rpm_pos is calculated from a calibratable map p_PedaccL and the variable lim_var_rpm_neg is calculated from a calibratable map n_PedaccL.
• the variable e lim_var_rpm_pos is calculated from a calibratable map p_PedaccL
• the variable lim_var_rpm_neg is calculated from a calibratable map n_PedaccL.
• the generation means 13 goes to step 29 and checks if the filtered gradient of the depressing of the accelerator pedal Pedacc_grd_fil is greater than one fourth threshold PedaccFD corresponding to rapid depressing of the accelerator pedal without, however, the position of the accelerator pedal reaching the second threshold threshold __P e ⁇ AccF.
• the generation means 13 passes to a fourth mode 30 in which the variable lim_var_rpm_pos is calculated from 'a cali brabl e p___PedaccFD map and the variable Um_var_rpm_neg is calculated from a calibratable map n__PedaccFD. These two maps depend on the activity information of the Acond driver and the speed of the Vveh motor vehicle.
• the generation means 1 3 goes to step 3 1 and checks whether the filtered gradient of the depressing of the accelerator pedal Pedacc _grd_fil is less than a fifth threshold threshold _P 'edaccLD corresponding to a rapid reading of the accelerator pedal without however reaching the second threshold threshold _PedaccL.
• the generation means 13 goes to a fifth mode 32 in which the variable lim__var_rpm_pos is calculated from a calibratable map p_PedaccLD and the variable lim_ ar_rpm_neg is calculated from a calibratable map n_PedaccLD. These two maps depend on the Acond driver activity information and the speed of the Vveh motor vehicle.
• the generation means 1 3 passes to a sixth mode 33 in which the variable lim_var_rpm_ ⁇ os is calculated from a calibratable mapping p_PedaccS and the variable lim_var_rpm_neg is calculated from a calibratable mapping n_PedaccS.
• p_PedaccS a calibratable mapping p_PedaccS
• lim_var_rpm_neg a calibratable mapping n_PedaccS.
• the generation means 13 thus makes it possible to transmit a limitation of variation of the speed of the heat engine to the determination means 2 in order to improve the acoustics within the passenger compartment of the motor vehicle, by transmitting the setpoint signals for limiting the variations of the engine speed in the direction of the increase lim_var_rpm_pos and of limiting the speed in the direction of the reduction lim_var_rpm_neg, by means of determination 2.
• Said variable limitation signals thus take into account the variations in the demand for torque generated from the accelerator pedal
• the determination means 2 also receives a static torque setpoint Cs from the generator 1 1 via the connection 34 and a static coupling setpoint Cd from the generator 1 2 via of the connection 35.
• the means 2 for determining the operating point of the propulsion unit 3 thus receives four control signals lim__var_rpm_pos, lim_var_rptn_neg, Cs and Cd. The means of determination 2 thus allows independent parameterization of the modules
• the module 36 delivering a torque signal to the wheel C, the module 37 a battery power signal Pbat, and the module 38 a signal for controlling engine speed N.
• Said signals are transmitted, respectively via connections 39, 40 and 41, to the module 4 for producing the operating point of the propulsion unit 3 making it possible to control the control members of the propulsion unit 3 via connection 42 and the driving wheels 43 by the connection 44 in a manner analogous to patent application FR-A-2 827 339 in the name of the applicant.
• the present invention thus makes it possible to carry out a control applied to the wheel of the operating point of the powertrain making it possible to generate limit setpoints for the speed of said thermal engine integrated in the powertrain directly dependent on the state of the vehicle but also adapted to the will of the driver, in particular by means of the accelerator pedal, in order to obtain an improved driving pleasure.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Hybrid Electric Vehicles (AREA)
• Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

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• 2004
  • 2004-05-28 FR FR0405804A patent/FR2870793B1/fr not_active Expired - Fee Related
• 2005
  • 2005-05-30 EP EP05766710A patent/EP1753635B8/de not_active Not-in-force
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  • 2005-05-30 US US11/596,880 patent/US8112205B2/en not_active Expired - Fee Related
  • 2005-05-30 DE DE602005007890T patent/DE602005007890D1/de active Active
  • 2005-05-30 WO PCT/FR2005/050388 patent/WO2005118327A1/fr active IP Right Grant
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