WO2012057118A1 - ハイブリッド車両の駆動トルク制御装置 - Google Patents
ハイブリッド車両の駆動トルク制御装置 Download PDFInfo
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- WO2012057118A1 WO2012057118A1 PCT/JP2011/074524 JP2011074524W WO2012057118A1 WO 2012057118 A1 WO2012057118 A1 WO 2012057118A1 JP 2011074524 W JP2011074524 W JP 2011074524W WO 2012057118 A1 WO2012057118 A1 WO 2012057118A1
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- engine torque
- engine
- torque
- delay
- command value
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
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- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
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- Y10S903/902—Prime movers comprising electrical and internal combustion motors
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Definitions
- the present invention relates to a driving force control device for a hybrid vehicle having an electric travel (EV) mode in which the vehicle travels only by power from the motor generator and a hybrid travel (HEV) mode in which the vehicle can travel by power from both the engine and the motor generator.
- EV electric travel
- HEV hybrid travel
- a drive torque control device for a hybrid vehicle has been proposed (see JP2001-268714A) that achieves the required driving force of an occupant by compensating for transient output fluctuations of the engine with motor torque.
- the target drive torque is calculated based on the accelerator pedal depression amount and the vehicle speed
- the power generation torque by the motor is calculated based on the state of charge of the battery, and the torque value that achieves the target drive torque and the power generation torque
- the engine is controlled using as a target engine torque.
- the motor is controlled using the difference between the target drive torque and the estimated engine torque as the target motor torque.
- the required power generation amount can be achieved constantly and the state of charge of the battery can be satisfied.
- transiently the required driving force of the occupant can be achieved, and quick acceleration or deceleration can be performed.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a drive torque control device for a hybrid vehicle that is suitable for improving the control accuracy of the vehicle drive torque by improving the estimation accuracy of the engine torque. To do.
- the drive torque control device for a hybrid vehicle of the present invention includes an engine and a motor generator as power sources, and selects an electric travel mode using only power from the motor generator and a hybrid travel mode using power from both the engine and motor generator. This is possible and is applied to a hybrid vehicle that determines a driving force based on information according to a driver's required load and performs mode switching between the electric travel mode and the hybrid travel mode.
- the hybrid vehicle drive torque control device performs an engine torque estimation unit that estimates engine torque by performing delay compensation using a delay filter on an engine torque command value, and a delay coefficient that indicates a delay degree of the delay filter.
- a delay coefficient selection unit that selects one of an increase-side delay coefficient when the engine torque command value increases and a decrease-side delay coefficient when the engine torque command value decreases.
- the delay coefficient selection unit switches between the increase-side delay coefficient and the decrease-side delay coefficient when the difference between the engine torque estimated value and the engine torque command value that is a filter input value is equal to or less than a predetermined value.
- FIG. 1 is a schematic plan view showing a power train of a hybrid vehicle to which the idea of the present invention can be applied.
- FIG. 2 is a block diagram showing a control system for the power train.
- FIG. 3 is a functional block diagram of the integrated controller in the control system.
- FIG. 4 is a characteristic diagram of the target driving force used when the target driving force calculation unit obtains the target driving force.
- FIG. 5 is a characteristic diagram of assist torque used when the target driving force calculation unit obtains the assist torque of the motor generator.
- FIG. 6 is a region diagram showing an electric travel (EV) mode region and a hybrid travel (HEV) mode region of the hybrid vehicle.
- FIG. 7 is a characteristic diagram showing a target charge / discharge amount characteristic with respect to a battery storage state of the hybrid vehicle.
- FIG. 1 is a schematic plan view showing a power train of a hybrid vehicle to which the idea of the present invention can be applied.
- FIG. 2 is a block diagram showing a control system for the power train.
- FIG. 8 is an engine torque increase progress explanatory diagram showing the engine torque increase process up to the best fuel consumption line according to the vehicle speed.
- FIG. 9 is a shift characteristic diagram for setting a transmission gear ratio in the shift control unit.
- FIG. 10 is a functional block diagram for calculating an engine torque command value and a motor generator torque command value, which are executed by the operating point command unit.
- FIG. 11 is a functional block diagram of the engine torque estimation unit.
- FIG. 12A is a map of the increasing coefficient a selected when the engine torque command value increases.
- FIG. 12B is a map of an increase side coefficient b selected when the engine torque command value increases.
- FIG. 12C is a map of the decreasing side coefficient a ′ selected when the engine torque command value decreases.
- FIG. 12A is a map of the increasing coefficient a selected when the engine torque command value increases.
- FIG. 12B is a map of an increase side coefficient b selected when the engine torque command value increases.
- FIG. 12C is a map of
- FIG. 12D is a map of the decrease side coefficient b ′ selected when the engine torque command value decreases.
- FIG. 13 is a control flowchart of the engine torque estimation calculation.
- FIG. 14 is a subroutine for determining engine torque increase.
- FIG. 15 shows a subroutine for filter reset determination.
- FIG. 16 is a time chart showing an operation example 1 of the engine torque estimating means.
- FIG. 17 is a time chart showing an operation example 2 of the engine torque estimating means.
- FIG. 18 is a time chart showing an operation example 3 of the engine torque estimating means.
- FIG. 19 is a time chart showing an operation example of the engine torque estimating means of the comparative example.
- FIG. 20A is a schematic plan view showing a power train of a hybrid vehicle showing an example in which the arrangement of the second clutch is changed.
- FIG. 20B is a schematic plan view showing a power train of a hybrid vehicle showing another example in which the arrangement of the second clutch is changed.
- FIG. 1 is a diagram showing a power train of a hybrid vehicle to which the drive torque control device for a hybrid vehicle of the present invention can be applied.
- This hybrid vehicle is based on a front engine / rear wheel drive vehicle (rear wheel drive vehicle).
- reference numeral 1 denotes an engine as a first power source
- reference numeral 2 denotes a drive wheel (rear wheel).
- the automatic transmission 3 is arranged in tandem behind the engine 1, that is, behind the vehicle in the longitudinal direction, in the same manner as a normal rear wheel drive vehicle. Further, a motor generator 5 is provided by coupling the rotation from the engine 1 (crankshaft 1a) to the shaft 4 for transmitting the rotation to the input shaft 3a of the automatic transmission 3, and this motor generator 5 is used as a second power source.
- the motor generator 5 acts as a drive motor (electric motor) or as a generator (generator).
- the motor generator 5 is disposed between the engine 1 and the automatic transmission 3.
- a first clutch 6 is inserted between the motor generator 5 and the engine 1, more specifically, between the shaft 4 and the engine crankshaft 1 a, and the engine 1 and the motor generator 5 are detachably coupled by the first clutch 6.
- the first clutch 6 can change the transmission torque capacity continuously or stepwise.
- the first clutch 6 is configured by a wet multi-plate clutch capable of changing the transmission torque capacity by controlling the clutch hydraulic oil flow rate and the clutch hydraulic pressure continuously or stepwise with a proportional solenoid.
- the second clutch 7 is inserted between the motor generator 5 and the driving wheel (rear wheel) 2, and the motor generator 5 and the driving wheel (rear wheel) 2 are detachably coupled by the second clutch 7.
- the second clutch 7 can change the transmission torque capacity continuously or stepwise.
- the second clutch 7 is constituted by a wet multi-plate clutch capable of changing the transmission torque capacity by controlling the clutch hydraulic oil flow rate and the clutch hydraulic pressure continuously or stepwise with a proportional solenoid.
- the automatic transmission 3 may be any known one, and by selectively engaging and releasing a plurality of speed change friction elements (clutch, brake, etc.), a transmission system is obtained by a combination of engagement and release of these speed change friction elements. Determine the road (shift stage). Accordingly, the automatic transmission 3 shifts the rotation from the input shaft 3a at a gear ratio corresponding to the selected shift speed and outputs it to the output shaft 3b. This output rotation is distributed and transmitted to the left and right rear wheels 2 by the differential gear device 8 and used for traveling of the vehicle.
- the automatic transmission 3 is not limited to the stepped type as described above, and may be a continuously variable transmission.
- a shift friction element existing in the automatic transmission 3 is used. (See FIG. 1).
- the second clutch 7 when the second clutch 7 is engaged, the automatic transmission 3 is brought into a power transmission state by performing the above-described shift speed selection function (shift function), and in addition, the first clutch 6 is released and engaged.
- shift speed selection function shift function
- a mode selection function described later can be achieved. This eliminates the need for the dedicated second clutch, which is very advantageous in terms of cost.
- a dedicated clutch may be newly provided as the second clutch 7.
- the second clutch 7 can be provided between the input shaft 3 a of the automatic transmission 3 and the motor generator shaft 4.
- a second clutch 7 can be provided between the output shaft 3b of the automatic transmission 3 and the rear wheel drive system.
- the first clutch 6 is released and the second clutch 6 is released.
- the automatic transmission 3 is brought into a power transmission state.
- the second clutch 7 is a shift friction element to be engaged at the current shift stage among the shift friction elements in the automatic transmission 3, and is different for each selected shift stage.
- the automatic transmission 3 When a hybrid travel (HEV travel) mode used for high speed travel or heavy load travel is required, the automatic transmission 3 remains in the corresponding gear selection state (power transmission state) by engaging the second clutch 7. The first clutch 6 is also engaged. In this state, both the output rotation from the engine 1 and the output rotation from the motor generator 5 reach the transmission input shaft 3a. The automatic transmission 3 shifts the rotation of the input shaft 3a in accordance with the currently selected gear and outputs the rotation from the transmission output shaft 3b. Then, the rotation from the transmission output shaft 3b reaches the rear wheel 2 through the differential gear device 8, and the vehicle can be hybrid-driven (HEV travel) by both the engine 1 and the motor generator 5.
- HEV travel hybrid travel
- the surplus energy is converted into electric power by operating the motor generator 5 as a generator by the surplus energy.
- the fuel efficiency of the engine 1 can be improved.
- the engine 1, the motor generator 5, the first clutch 6, and the second clutch 7 that constitute the power train of the hybrid vehicle shown in FIG. 1 are controlled by a system as shown in FIG.
- the control system of FIG. 2 includes an integrated controller 20 that integrally controls the operating point of the power train.
- the operating point of the power train is defined by the target engine torque, the target motor generator torque (which may be the target motor generator rotational speed), the target transmission torque capacity of the first clutch 6, and the target transmission torque capacity of the second clutch 7. To do.
- the integrated controller 20 receives each signal to be described later in order to determine the operating point of the power train.
- a signal from the engine rotation sensor 11 that detects the engine rotation speed a signal from the motor generator rotation sensor 12 that detects the motor generator rotation speed, and an input rotation sensor that detects the transmission input rotation speed.
- an accelerator opening sensor 15 driving load detecting means for detecting a signal from the output rotation sensor 14 for detecting the transmission output rotation speed and an accelerator pedal depression amount (accelerator opening APO) indicating a required load on the vehicle.
- the signal from is input.
- BPS brake hydraulic pressure
- SOC power storage state
- the engine rotation sensor 11, the motor generator rotation sensor 12, the input rotation sensor 13, and the output rotation sensor 14 can each be arranged as shown in FIG.
- the integrated controller 20 can realize the driving force of the vehicle desired by the driver from the accelerator opening APO, the battery storage state SOC, and the transmission output speed (vehicle speed VSP) among the input information. (EV mode, HEV mode) is selected. Further, the integrated controller 20 determines the target engine torque, the target motor generator torque (which may be the target motor generator rotational speed), the target first speed from the accelerator opening APO, the battery storage state SOC, and the transmission output rotational speed (vehicle speed VSP). The clutch transmission torque capacity and the target second clutch transmission torque capacity are respectively calculated. The target engine torque is supplied to the engine controller 21, and the target motor generator torque (which may be the target motor generator rotational speed) is supplied to the motor generator controller 22.
- the engine controller 21 controls the engine 1 so that the engine torque becomes the target engine torque.
- the motor generator controller 22 controls the motor generator 5 via the battery 9 and the inverter 10 so that the torque (or rotation speed) of the motor generator 5 becomes the target motor generator torque (or target motor generator rotation speed).
- the integrated controller 20 supplies a solenoid current corresponding to the target first clutch transmission torque capacity and the target second clutch transmission torque capacity to an engagement control solenoid (not shown) of the first clutch 6 and the second clutch 7. Then, the integrated controller 20 performs the first control so that the transmission torque capacity of the first clutch 6 matches the target transmission torque capacity, and the transmission torque capacity of the second clutch 7 matches the target second clutch transmission torque capacity.
- the clutch 6 and the second clutch 7 are individually controlled for fastening force.
- FIG. 3 is a functional block diagram of the integrated controller 20.
- the integrated controller 20 selects the above-described operation mode (EV mode, HEV mode) and calculates the target engine torque, target motor generator torque, target first clutch transmission torque capacity, and target second clutch transmission torque capacity. 3 is executed as shown in the block diagram of each function.
- the target driving force calculation unit 30 calculates the target steady driving torque and the MG assist torque from the accelerator opening APO and the vehicle speed VSP using the target steady driving torque map shown in FIG. 4 and the MG assist torque map shown in FIG. .
- the operation mode selection unit 40 determines a target operation mode from the accelerator opening APO and the vehicle speed VSP using the EV-HEV region map shown in FIG. As is clear from the EV-HEV region map shown in FIG. 6, the HEV mode is selected at high loads and high vehicle speeds, and the EV mode is selected at low loads and low vehicle speeds. Further, the operation mode selection unit 40 is accompanied by starting the engine 1 from the EV mode when the operation point determined by the combination of the accelerator opening APO and the vehicle speed VSP enters the HEV region beyond the EV ⁇ HEV switching line during EV traveling. Switch the mode to HEV mode.
- the operation mode selection unit 40 switches the mode from the HEV mode to the EV mode accompanied by the stop of the engine 1 and the disconnection of the engine 1 when the operation point exceeds the HEV ⁇ EV switching line and enters the EV region during HEV traveling.
- the engine start / stop line is set such that the accelerator opening APO decreases as the battery capacity SOC decreases.
- the starting process of the engine 1 is executed when the accelerator opening APO exceeds (becomes larger) the engine starting line shown in FIG. 6 in the EV mode. That is, the torque capacity of the second clutch 7 is controlled so as to cause the second clutch 7 to slip into the half-clutch state, and after it is determined that the second clutch 7 has started slipping, the first clutch 6 is started to be engaged and the engine is started. Increase rotation. When the engine speed reaches the speed at which the initial explosion is possible, the first clutch 6 is completely engaged when the engine 1 is operated and the motor generator speed is close to the engine speed, and then the second clutch 7 is locked up. To make transition to HEV mode.
- the operating point command unit 60 calculates the operating point arrival target from the accelerator opening APO, the target steady drive torque, the MG assist torque, the target operation mode, the vehicle speed VSP, and the target charge / discharge power. That is, as the operating point reaching target, the transient target engine torque command value, the target motor generator torque, the target solenoid current corresponding to the target transmission torque capacity of the first clutch 6, and the target of the second clutch 7 are obtained. The transmission torque capacity and the target shift speed are calculated. Also, the output required to increase the engine torque from the current operating point to the best fuel consumption line shown in FIG. 8 is calculated, and this is compared with the target charge / discharge amount (electric power), and the smaller output is requested. As an output, it is added to the engine output.
- the shift control unit 70 responds in the automatic transmission 3 so that the target second clutch transmission torque capacity and the target shift speed are achieved based on the target second clutch transmission torque capacity and the target shift speed. Drive the solenoid valve. As a result, the automatic transmission 3 enters the power transmission state in which the target gear stage is selected while the second clutch 7 is controlled to be engaged so that the target second clutch transmission torque capacity is achieved.
- FIG. 9 is a shift map in which a solid line indicates an upshift line and a broken line indicates a downshift line. Then, from the vehicle speed and the accelerator opening APO, it is determined how many the next shift stage is from the current shift stage, and if there is a shift request, the shift clutch is controlled to change the speed.
- FIG. 10 is a functional block diagram for calculating the engine torque command value and the motor generator torque command value, which is executed by the operating point command unit 60.
- the target driving torque is calculated by adding the target steady driving torque and the positive torque of the target motor assist torque via the positive torque filter 62 by the adder 61.
- the target steady drive torque is divided by the target drive torque by the divider 63, and the engine share of the drive torque is calculated.
- the target drive torque is multiplied by the engine sharing ratio by the multiplier 65, and further, the generated torque is added by the adder 66, and an engine torque command value is obtained. Is calculated.
- the engine torque command value is output to the engine controller 21 and the engine torque estimating unit 67.
- the engine controller 21 controls the engine 1 so that the engine torque becomes the target engine torque.
- the engine torque estimating unit 67 calculates an engine torque estimated value according to the transient characteristics of the engine 1.
- the target drive torque whose amount of change per unit time is limited by the rate limiter 64 is calculated as a motor torque command value by subtracting the engine torque estimated value by the engine torque estimating unit 67 by the subtractor 68, and the motor generator controller 22 is output.
- the motor generator controller 22 controls the motor generator 5 via the battery 9 and the inverter 10 so that the torque of the motor generator 5 becomes the target motor generator torque.
- FIG. 11 is a functional block diagram of the engine torque estimation unit.
- the engine torque estimating unit 67 includes a secondary low-pass filter 81, a switching unit 82, and a computing unit 84.
- the secondary low-pass filter 81 calculates an engine torque estimated value based on the low-pass filter input value based on the engine torque command value.
- the switch 82 switches and outputs either the calculated engine torque estimated value or the engine torque command value in accordance with the reset signal.
- the calculator 84 generates a low-pass filter input value, a reset signal, and an engine torque increase mode determination signal.
- the secondary low-pass filter 81 has a characteristic represented by the following expression (1) between the input value and the output value.
- “ ⁇ ” represents a power.
- the secondary coefficient a and the primary coefficient b in the expression (2) are variable according to the engine speed and the engine torque command value.
- the engine torque estimating unit 67 includes a secondary coefficient setting unit 83 that sets the secondary coefficient a and a primary coefficient setting unit 90 that sets the primary coefficient b.
- the secondary coefficient setting unit 83 includes an increase-side coefficient a selected when the engine torque command value increases and a decrease-side coefficient a 'selected when the engine torque command value decreases. Either the increase side coefficient a or the decrease side coefficient a ′ is selected by a delay coefficient switching unit (delay coefficient selecting unit) 86 that is switched by an engine torque increase mode determination signal, and is input to the select high switching unit 87. Is done.
- the secondary high limit value of the secondary low-pass filter 81 is also input to the select high switch 87, and is compared with the secondary coefficient lower limit value and the increase side coefficient a or decrease side coefficient a ′ input to the other side. Thus, the secondary coefficient determined to be high is input to the secondary low-pass filter 81.
- the primary coefficient setting unit 90 also includes an increasing coefficient b selected when the engine torque command value increases and a decreasing coefficient b ′ selected when the engine torque command value decreases.
- One of the increase side coefficient b and the decrease side coefficient b ' is selected by the switch 91 that is switched by an engine torque increase mode determination signal, and is input to the select high switch 92.
- the select high switch 92 also receives the primary coefficient lower limit value of the secondary low-pass filter 81, and compares the primary coefficient lower limit value with the increase side coefficient b or decrease side coefficient b ′ input to the other side.
- the primary coefficient determined to be high is input to the secondary low-pass filter 81.
- FIGS. 12A to 12D The increase side coefficients a and a ′ selected when the engine torque command value is increased and the decrease side coefficients b and b ′ selected when the engine torque command value is decreased are shown in FIGS. 12A to 12D.
- a set value is set and stored in advance. That is, FIG. 12A shows the setting example of the increasing secondary coefficient a, FIG. 12B shows the increasing primary coefficient b, FIG. 12C shows the decreasing secondary coefficient a ′, and FIG. 12D shows the decreasing primary coefficient b ′.
- Each set coefficient the larger the numerical value, the larger the degree of delay of the secondary low-pass filter 81, and the smaller the numerical value, the smaller the degree of delay of the secondary low-pass filter 81.
- Each set delay coefficient is set to be variable according to the engine speed and the engine torque command value. The higher the engine speed, or the larger the engine torque command value becomes than the predetermined torque, the secondary low-pass filter.
- the delay degree 81 is set to be small.
- the response speed of engine torque increases as the engine speed increases.
- the response after engine recovery is fast, and thereafter, the response is slow in the low torque region, and the response becomes fast as the high torque region is reached.
- the engine torque estimation unit 67 having the above configuration is operated based on a control flowchart of the engine torque estimation calculation shown in FIG. FIG. 14 is a subroutine for engine torque increase determination by the calculator 84, and FIG. 15 is a filter reset determination subroutine by the calculator 84.
- step S11 it is determined whether or not the vehicle travel mode is transitioning from the HEV mode to the EV mode. In this determination, when the transition to the EV mode is in progress, the engine torque command value is decreasing toward zero torque, so the filter input torque (engine torque command value) is set to 0 in step S12. On the other hand, if it is determined in step S11 that the transition to the EV mode is not in progress, the engine torque is changed in response to the engine torque command value, so that the process proceeds to step S13 and the filter input torque is set as the engine torque command value. .
- step S14 it is determined whether or not the engine torque increase determination is ON (torque increasing).
- the engine torque increase determination is executed by the subroutine of FIG.
- step S21 of FIG. 14 it is determined whether or not the previous engine torque increase determination is ON (torque increasing).
- the process proceeds to step S22, and when the previous engine torque increase determination is OFF (torque decreasing), the process proceeds to step S23.
- step S22 it is determined whether or not the absolute value of the difference between the previous estimated engine torque value determined to be increasing torque and the current engine torque command value is less than a preset switching permission torque. If the difference between the previous estimated engine torque value and the current engine torque command value is equal to or greater than the permitted torque, the process proceeds to step S27, where the torque increase determination is held at the previous value, and the difference is less than the permitted torque. Then, the process proceeds to step S24.
- step S22 when the engine torque increase determination is ON, first, when the difference between the estimated engine torque value (previous value) and the engine torque command value (current value) in step S22 is less than a preset switching permission torque. The process proceeds to step S24 only, otherwise proceeds to step S27.
- the switching permission torque is a threshold set in advance in order to determine that the difference between the engine torque command value and the estimated engine torque value is small.
- step S24 it is determined whether or not a differential torque command value obtained by subtracting the previous engine torque command value from the current engine torque command value is equal to or less than a preset reduction determination torque.
- the decrease determination torque is a threshold value for determining that the engine torque command value is clearly decreased.
- the engine torque increase determination is ON, the difference between the engine torque command value and the previous engine torque estimated value in step S22, and the difference determination between the previous engine torque command value in step S24.
- the engine torque increase determination is switched from ON to OFF on condition that both conditions are satisfied. Therefore, unless both conditions are satisfied, the engine torque increase determination is maintained in the ON state.
- step S23 it is determined whether or not the absolute value of the difference between the previous estimated engine torque value determined to be decreasing in torque and the current engine torque command value is less than a preset switching permission torque. If the difference between the previous estimated engine torque value and the current engine torque command value is greater than or equal to the permitted torque, the process proceeds to step S27, where the torque increase determination is held at the previous value, and if the difference is less than the permitted torque. The process proceeds to step S25.
- step S23 when the engine torque increase determination is OFF, first, when the difference between the estimated engine torque value (previous value) and the engine torque command value (current value) in step S23 is less than a preset switching permission torque. The process proceeds to step S25 only, otherwise the process proceeds to step S27.
- step S25 it is determined whether or not a differential torque command value obtained by subtracting the previous engine torque command value from the current engine torque command value exceeds a preset increase determination torque. If the differential torque command value is less than the increase determination torque, the process proceeds to step S27, where the torque increase determination is held at the previous value, and if it is greater than the increase determination torque, the process proceeds to step S28, where the engine torque increase determination is performed. ON (torque increasing).
- step S14 if the engine torque increase determination in step S14 is ON (torque increasing), the process proceeds to step S15, and the delay coefficient switchers 86 and 91 in FIG. 11 are switched to the increase side. As a result, the increase-side delay coefficients a and b calculated from the engine speed and the filter input torque are input to the secondary low-pass filter 81. If the engine torque increase determination in step S14 is OFF (during torque decrease), the process proceeds to step S16, and the delay coefficient switchers 86 and 91 in FIG. 11 are switched to the decrease side. As a result, the decrease side delay coefficients a ′ and b ′ calculated from the engine speed and the filter input torque are input to the secondary low-pass filter 81.
- step S17 it is determined whether or not the filter reset determination is ON.
- the filter reset determination is executed by the subroutine of FIG.
- step S31 of FIG. 15 it is determined whether or not there is an engine fuel cut request. If there is an engine fuel cut request, the process proceeds to step S32. On the other hand, if there is no fuel cut request, the process proceeds to step S34, and the filter reset determination is turned OFF.
- step S32 it is determined whether or not the number of engine fuel cut cylinders is equal to or greater than the maximum number of cylinders.
- the maximum number of cylinders in this case is the number of cylinders of the engine 1, which is 6 for a 6-cylinder engine and 4 for a 4-cylinder engine. If the number of fuel cut cylinders is greater than or equal to the maximum number of cylinders, the process proceeds to step S33, the filter reset determination is turned ON, and the number of fuel cut cylinders is less than the maximum number of cylinders (a state in which combustion is maintained even with one cylinder). Advances to step S34, and the filter reset determination is turned OFF.
- step S17 if the filter reset determination in step S17 is ON (the number of fuel cut cylinders is equal to or greater than the maximum number of cylinders), the process proceeds to step S18, and the estimated value of the engine torque is obtained by switching the switch 82 in FIG. Is the engine torque command value. That is, the delay filter is disabled.
- the filter reset determination in step S17 is OFF, that is, there is no fuel cut request, or if the number of fuel cut cylinders is less than the maximum number of cylinders, the process proceeds to step S19, and an engine torque command value is input. Based on the delay coefficients a, b or a ′, b ′, the estimated engine torque value is calculated.
- FIGS. 16 to 18 An operation example of the engine torque estimating unit 67 will be described based on the time charts shown in FIGS. 16 to 18 and the time chart of the comparative example shown in FIG.
- the engine torque command value changes from positive torque to negative torque at time points t1, t11, and t31, and from negative torque to positive torque at time points t3, t13, and t33.
- the engine torque estimated value and the engine torque increase determination change are shown.
- FIG. 19 shows a comparative example in which the engine torque increase determination is changed to ON / OFF in accordance with an increase / decrease change of the engine torque command value equal to or greater than a predetermined torque.
- the engine torque increase determination is changed to ON / OFF according to an increase / decrease change of the engine torque command value that is equal to or greater than a predetermined torque. For this reason, in a state where the estimated engine torque value decreases with a second-order delay, the engine torque increase determination is turned ON, so that a phenomenon occurs in which the estimated engine torque value oscillates up and down as shown by a broken line. That is, even when the engine torque command value increases while the estimated engine torque value deviates from the command value, the actual engine 1 reduces the torque even if the delay factor on the torque increase side is used. The response is still decreasing, and the estimation accuracy of the engine torque is not improved.
- the estimated engine torque value has a second order lag as the engine torque command value is changed from the positive torque state to the negative torque state at time t1. It decreases with it. Further, the determination that the difference between the estimated engine torque value (previous value) and the engine torque command value (current value) in step S22 is equal to or less than the preset switching permission torque is satisfied. Then, the difference from the last-time engine torque command value in step S24 is equal to or less than the decrease determination torque. For this reason, the engine torque increase determination is changed from the ON state to the OFF state at time t1.
- step S23 When the engine torque command value changes from negative torque to positive torque at time t3, the difference between the engine torque estimated value (previous value a1 point) and the engine torque command value (b1 point) exceeds the switching permission torque. . For this reason, the determination in step S23 is not satisfied, and the previous value in step S27 is held (OFF state) in the engine torque increase determination.
- the estimated engine torque value converges to the engine torque command value after time t4, but after time t4, the determination in step S23 is satisfied, but the difference from the previous engine torque command value is zero. Yes, and below the increase determination torque. For this reason, the determination in step S25 is not satisfied, and the engine torque increase determination is maintained in the OFF state.
- the estimated engine torque value decreases with a secondary delay. Further, the determination that the difference between the estimated engine torque value (previous value) and the engine torque command value (current value) in step S22 is equal to or less than the preset switching permission torque is satisfied. Then, the difference from the last-time engine torque command value in step S24 is equal to or less than the decrease determination torque. Therefore, the engine torque increase determination is changed from the ON state to the OFF state at time t11.
- step S23 When the engine torque command value changes from negative torque to positive torque at time t13, the difference between the engine torque estimated value (previous value a2 point) and the engine torque command value (b2 point) is equal to or less than the switching permission torque.
- the determination in step S23 is satisfied. Since the difference between the engine torque command value and the previous engine torque command value exceeds the increase determination torque, the determination in step S25 is also satisfied. For this reason, the engine torque increase determination is changed from the OFF state to the ON state at time t13.
- the time chart shown in FIG. 18 shows changes in the estimated engine torque value and the engine torque increase determination when the engine torque command value increases at time t21 and changes to decrease at time t24.
- the estimated engine torque value increases with a secondary delay.
- the difference between the engine torque estimated value (previous value a3 point) and the engine torque command value (b3 point) at time t25 is the switching permission torque. Since the following is true, the determination in step S22 is satisfied. Since the difference between the engine torque command value (b3 point) and the engine torque command value of the last time exceeds the decrease determination torque, the determination in step S24 is also satisfied. Therefore, the engine torque increase determination is changed from the ON state to the OFF state at time t25. Therefore, the estimated engine torque value after time t24 is calculated based on the decrease side delay coefficient and gradually converges to the engine torque command value.
- the engine torque can be estimated with high accuracy, the accuracy of the motor generator torque that complements the engine torque can be improved, and the required driving force of the occupant can be transiently achieved to perform agile acceleration and deceleration. Can do.
- the delay coefficient indicating the degree of delay of the delay filter 81 includes increase side delay coefficients a and b when the engine torque command value increases and decrease side delay coefficients a 'and b' when the engine torque command value decreases.
- the increase-side delay coefficient and the decrease-side delay coefficient are switched by setting the difference between the engine torque estimated value and the engine torque command value, which is the filter input value, to a predetermined value or less, and the change in the engine torque command value being preset. This is performed when the increase determination torque exceeds or falls below the decrease determination torque.
- the increase side delay coefficient and the decrease side delay coefficient of the delay filter are set according to the engine speed and the engine torque command value, respectively, and the engine torque command value increases as the engine speed increases. As the time elapses, the delay degree is set to be smaller.
- the engine torque response is faster as the engine speed is higher.
- the response after engine recovery is fast, and thereafter, the response is slow in the low torque region, and the response becomes fast as the high torque region is reached.
- (C) The delay filter is disabled when the engine 1 shifts to the fuel cut mode. That is, when the engine 1 enters the fuel cut mode, the engine torque changes stepwise. Therefore, the estimation accuracy of the engine torque can be improved by disabling the delay filter.
- the engine torque command value input to the delay filter is zero torque during the transition from the hybrid travel mode to the electric travel mode due to the fuel cut request to the engine 1, and the fuel cut torque from the time when the electric travel mode is entered. .
- the engine 1 transitions to the engine fuel cut mode of the EV mode after performing the idle operation state. Therefore, when the HEV mode is changed to the EV mode, the engine torque estimation accuracy can be improved by setting the input value of the delay filter to 0.
- the delay filter is composed of a secondary delay filter. For this reason, the accuracy of the engine estimated torque can be further improved.
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- Combustion & Propulsion (AREA)
- Hybrid Electric Vehicles (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
Description
G(s)=ω^2/(S^2+2ζωS+ω^2)=1/{(1/ω2)S^2+(2ζ/ω)S+1} …(1)
G(s)=1/{aS^2+bS+1} …(2)
Claims (6)
- 動力源としてエンジンおよびモータジェネレータを備え、モータジェネレータからの動力のみによる電気走行モードと、エンジンおよびモータジェネレータの双方からの動力によるハイブリッド走行モードとを選択可能で、運転者による要求負荷に応じた情報に基づいて駆動力を決定すると共に、電気走行モードおよびハイブリッド走行モード間でのモード切替えを行うハイブリッド車両の駆動トルク制御装置において、
エンジントルク指令値に対して、遅れフィルタによる遅れ補償を行うことによって、エンジントルクを推定するエンジントルク推定部と、
前記遅れフィルタの遅れ度合いを示す遅れ係数として、エンジントルク指令値が増加する場合の増加側遅れ係数とエンジントルク指令値が減少する場合の減少側遅れ係数のうちのいずれか一方を選択する遅れ係数選択部と、
を備え、
前記遅れ係数選択部は、エンジントルク推定値とフィルタ入力値であるエンジントルク指令値との差が所定値以下の場合に、前記増加側遅れ係数と前記減少側遅れ係数との切替えを行うハイブリッド車両の駆動トルク制御装置。 - 請求項1に記載のハイブリッド車両の駆動トルク制御装置において、
前記遅れ係数選択部は、エンジントルク推定値とフィルタ入力値であるエンジントルク指令値との差が所定値以下で、且つ、エンジントルク指令値の変化が、予め設定した増加判定トルクを超えるか、または、減少判定トルクを下回った場合に、前記増加側遅れ係数と前記減少側遅れ係数との切替えを行なうハイブリッド車両の駆動トルク制御装置。 - 請求項1または請求項2に記載のハイブリッド車両の駆動トルク制御装置において、
前記遅れフィルタの増加側遅れ係数及び減少側遅れ係数は、エンジン回転数及びエンジントルク指令値に応じて各々設定され、エンジン回転数が増加するに連れて、また、エンジントルク指令値が増加するに連れて、遅れ度合いが小さくなるように設定するハイブリッド車両の駆動トルク制御装置。 - 請求項1から請求項3のいずれか一項に記載のハイブリッド車両の駆動トルク制御装置において、
エンジンがフュエルカットモードに移行した場合に、前記遅れフィルタを無効にするハイブリッド車両の駆動トルク制御装置。 - 請求項1から請求項4のいずれか一項に記載のハイブリッド車両の駆動トルク制御装置において、
エンジンへのフュエルカット要求によるハイブリッド走行モードから電気走行モードへ遷移する間は、前記遅れフィルタへ入力するエンジントルク指令値をゼロトルクとし、電気走行モードとなった時点から、前記エンジントルク指令値をフュエルカットトルクとするハイブリッド車両の駆動トルク制御装置。 - 請求項1から請求項5のいずれか一項に記載のハイブリッド車両の駆動トルク制御装置において、
前記遅れフィルタは、2次遅れフィルタで構成しているハイブリッド車両の駆動トルク制御装置。
Priority Applications (4)
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EP11836251.6A EP2634059B1 (en) | 2010-10-26 | 2011-10-25 | Drive torque control device for hybrid vehicle |
JP2012540864A JP5482907B2 (ja) | 2010-10-26 | 2011-10-25 | ハイブリッド車両の駆動トルク制御装置 |
US13/881,464 US9050970B2 (en) | 2010-10-26 | 2011-10-25 | Driving torque control device for hybrid vehicle |
CN201180060200.0A CN103282257B (zh) | 2010-10-26 | 2011-10-25 | 混合动力车辆的驱动扭矩控制装置 |
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EP (1) | EP2634059B1 (ja) |
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US9050970B2 (en) | 2015-06-09 |
US20130226385A1 (en) | 2013-08-29 |
CN103282257B (zh) | 2016-02-24 |
EP2634059A1 (en) | 2013-09-04 |
JPWO2012057118A1 (ja) | 2014-05-12 |
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CN103282257A (zh) | 2013-09-04 |
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