WO2017086471A1 - Véhicule hybride et procédé de commande pour ce dernier - Google Patents

Véhicule hybride et procédé de commande pour ce dernier Download PDF

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Publication number
WO2017086471A1
WO2017086471A1 PCT/JP2016/084347 JP2016084347W WO2017086471A1 WO 2017086471 A1 WO2017086471 A1 WO 2017086471A1 JP 2016084347 W JP2016084347 W JP 2016084347W WO 2017086471 A1 WO2017086471 A1 WO 2017086471A1
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WIPO (PCT)
Prior art keywords
braking force
relative relationship
motor generator
vehicle
deceleration command
Prior art date
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PCT/JP2016/084347
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English (en)
Japanese (ja)
Inventor
竜 山角
Original Assignee
いすゞ自動車株式会社
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Application filed by いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Priority to CN201680067476.4A priority Critical patent/CN108349487B/zh
Publication of WO2017086471A1 publication Critical patent/WO2017086471A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • 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
    • B60K6/48—Parallel type
    • B60K6/485—Motor-assist type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • 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
    • B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
    • B60K6/54—Transmission for changing ratio
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • 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
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • 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
    • 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
    • B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
    • B60W20/14—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion in conjunction with braking regeneration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present disclosure relates to a hybrid vehicle and a control method thereof, and more particularly, to a hybrid vehicle and a control method thereof that improve fuel efficiency by increasing a regenerative power generation amount of a motor generator during deceleration of the hybrid vehicle.
  • HEV hybrid vehicle
  • a hybrid system having an engine and a motor generator that are controlled in combination according to the driving state of the vehicle
  • driving force is assisted by a motor generator when the vehicle is accelerated or started, while regenerative power generation is performed by the motor generator during inertial traveling or deceleration.
  • the regenerative braking force by the motor generator can be increased according to the inter-vehicle distance and relative speed with the preceding vehicle without waiting for the deceleration command from the driver or the deceleration command from the control device running in the auto cruise mode. Will be generated.
  • An object of the present disclosure is to provide a hybrid vehicle and a control method thereof that can improve fuel efficiency by increasing the regenerative power generation amount of the motor generator without causing the driver to feel uncomfortable during deceleration of the hybrid vehicle. It is.
  • a hybrid vehicle of the present disclosure that achieves the above object includes a hybrid system having a motor generator connected to an output shaft that transmits engine power, a brake system that applies friction braking force to each wheel, the host vehicle, and a preceding vehicle.
  • a hybrid vehicle including a relative relationship acquisition device that acquires a relative relationship of a vehicle and a control device, a resistance braking force by an engine brake that has issued a deceleration command and stopped fuel injection of the engine, and the brake system
  • the control device includes: Based on the relative relationship acquired by the relative relationship acquisition device, the motor Increasing only the regenerative braking force by Nereta, it is characterized in that the total braking force is configured to perform control of larger than the required braking force.
  • the hybrid vehicle control method of the present disclosure that achieves the above object includes a resistance braking force by an engine brake that stops injection of fuel of an engine, a friction braking force applied to each wheel by a brake system, and a motor generator
  • the total braking force is determined based on the deceleration command after the deceleration command is issued.
  • the hybrid vehicle includes a hybrid system including a motor generator connected to an output shaft that transmits engine power, a brake system that applies friction braking force to each wheel, and the host vehicle.
  • the control device receives the deceleration command, and receives the deceleration command according to the received deceleration command.
  • the operation command by the driver's deceleration operation and the control command of the control device in the auto cruise mode can be exemplified.
  • the operation command include an accelerator-off command indicating that the accelerator pedal is turned off, a brake operation command indicating the amount of operation of the brake pedal, and the control command includes the engine in order to maintain the target vehicle speed.
  • Examples include coasting commands for setting an idling state, brake system operation commands, and the like.
  • the relative relationship between the host vehicle and the preceding vehicle is a relative relationship between the host vehicle and the preceding vehicle, and the distance between the host vehicle and the preceding vehicle and the relative speed of the preceding vehicle viewed from the host vehicle can be exemplified. .
  • Increasing only the regenerative braking force by the motor generator based on this relative relationship is based on the assumption that the total braking force is maintained at the required braking force by the deceleration command, that is, the current vehicle braking force is maintained. In addition, only the regenerative braking force by the motor generator is increased so that the relative relationship does not become a close relationship.
  • the proximity relationship is a relationship in which the friction braking force by the brake system is expected to increase when the host vehicle and the preceding vehicle approach each other. That is, the fact that the relative relationship is a close relationship indicates that the distance between the host vehicle and the preceding vehicle has become shorter, or the relative speed has become negative and the preceding vehicle has approached the host vehicle.
  • the relative relationship between the host vehicle and the preceding vehicle is set. Based on this, only the regenerative braking force of the motor generator is increased so that the total braking force is greater than the required braking force, so that the relative relationship between the host vehicle and the preceding vehicle can be appropriately maintained.
  • This control causes the hybrid vehicle to decelerate more than the degree of deceleration generated by the deceleration command, but only increases the regenerative braking force of the motor generator based on the relative relationship after the deceleration command is issued.
  • the deceleration command can give an impression that the relative relationship between the host vehicle and the preceding vehicle is properly maintained. As a result, the driver does not feel unintended deceleration, and drivability can be improved.
  • the regenerative power generation amount of the motor generator can be increased by increasing only the regenerative braking force of the motor generator.
  • the opportunity to charge the high voltage battery using fuel can be reduced.
  • the amount of charge of the high voltage battery increases, so that the opportunity to assist with the motor generator can be increased.
  • the regenerative power generation amount of the motor generator can be increased and the fuel consumption can be improved without causing the driver to feel uncomfortable during the deceleration of the hybrid vehicle.
  • FIG. 1 is a configuration diagram of a hybrid vehicle according to an embodiment of the present disclosure.
  • FIG. 2 is a flowchart illustrating a method for controlling the hybrid vehicle of FIG.
  • FIG. 3 is a correlation diagram between the brake opening degree (instructed operation amount) and the required braking force.
  • FIG. 4 is a correlation diagram between the gradient of the traveling road and the amount of increase / decrease in the required braking force.
  • FIG. 5 is a correlation diagram between the inter-vehicle distance and the increase / decrease amount of the regenerative braking force.
  • FIG. 6 is a correlation diagram between the relative speed and the amount of increase / decrease in the regenerative braking force.
  • FIG. 7 is a correlation diagram between the deceleration command and the total braking force after increasing the regenerative braking force.
  • FIG. 1 illustrates a hybrid vehicle according to an embodiment of the present disclosure.
  • the hybrid vehicle (hereinafter referred to as “HEV”) is a vehicle including not only a normal passenger car but also a bus, a truck, a pickup truck, and the like, and an engine 10 and a motor generator that are controlled in combination according to the driving state of the vehicle.
  • a hybrid system 30 having 31 is provided.
  • the HEV also includes a drum brake 92 as a brake system that applies a friction braking force to each wheel.
  • the HEV includes a relative relationship acquisition device 85 that acquires the relative relationship between the host vehicle and the preceding vehicle.
  • the crankshaft 13 is rotationally driven by thermal energy generated by the combustion of fuel in a plurality (four in this example) of cylinders 12 formed in the engine body 11.
  • the engine 10 is a diesel engine or a gasoline engine.
  • the rotational power of the crankshaft 13 is transmitted to the transmission 20 through a clutch 14 (for example, a wet multi-plate clutch) connected to one end of the crankshaft 13.
  • the transmission 20 uses an AMT or an AT that automatically shifts to a target shift speed determined based on the HEV operating state and preset map data using the shift actuator 21.
  • the transmission 20 is not limited to the automatic transmission type such as AMT, and may be a manual type in which the driver manually changes gears.
  • Rotational power changed by the transmission 20 is transmitted to the differential 23 through the propeller shaft 22 and distributed to the pair of driving wheels 24 as driving force.
  • the hybrid system 30 includes a motor generator 31, an inverter 35 that is electrically connected to the motor generator 31 in order, a high voltage battery 32 (for example, 48V), a DC / DC converter 33, and a low voltage battery 34 (for example, 12V). ).
  • a high voltage battery 32 for example, 48V
  • a DC / DC converter 33 for example, 12V
  • a low voltage battery 34 for example, 12V.
  • the high voltage battery 32 include a lithium ion battery and a nickel metal hydride battery.
  • the low voltage battery 34 is a lead battery.
  • the DC / DC converter 33 has a function of controlling the charge / discharge direction and the output voltage between the high voltage battery 32 and the low voltage battery 34.
  • the DC / DC converter 33 can supply power to various vehicle electrical components 36 from the high voltage battery 32 in addition to the low voltage battery 34.
  • BMS battery management system
  • the DC / DC converter 33 and the vehicle electrical component 36 are illustrated as auxiliary machines that consume the power of the high-voltage battery 32, but the auxiliary machines are electrically connected to the high-voltage battery 32.
  • An electric air conditioner, an electric hydraulic pump, etc. can also be illustrated.
  • the motor generator 31 is an endless shape wound around a first pulley 15 attached to the rotating shaft 37 and a second pulley 16 attached to the other end of the crankshaft 13 which is an output shaft of the engine body 11. Power is transmitted to and from the engine 10 via the belt-shaped member 17. Note that power can be transmitted using a gear box or the like instead of the two pulleys 15 and 16 and the belt-like member 17. Further, the output shaft of the engine main body 11 connected to the motor generator 31 is not limited to the crankshaft 13, and may be a transmission shaft or the propeller shaft 22 between the engine main body 11 and the transmission 20, for example.
  • the motor generator 31 has a function of performing cranking instead of a starter motor (not shown) that starts the engine body 11.
  • the hybrid system 30 assists at least a part of the driving force by the motor generator 31 supplied with power from the high voltage battery 32, while at the time of inertia traveling or braking. Performs regenerative power generation by the motor generator 31, converts surplus kinetic energy into electric power, and charges the high voltage battery 32.
  • the drum brake 92 is a device that applies a friction braking force to each wheel including the drive wheel 24, and a disc brake may be used instead.
  • Examples of the brake system using the drum brake 92 as an example include an air brake using compressed air and a hydraulic brake using hydraulic pressure.
  • the relative relationship acquisition device 85 is a device that acquires the relative relationship R1 between the HEV and the preceding vehicle.
  • Examples of the relative relationship R1 include an inter-vehicle distance L1 between the HEV and a preceding vehicle traveling on the same lane as the HEV, and a relative speed ⁇ V1 of the preceding vehicle as viewed from HEV.
  • Examples of the relative relationship acquisition device 85 include a device that estimates a relative relationship from an image captured by a camera, and a device that measures a relative relationship using a millimeter wave radar, and more specifically, a lane departure prevention support system and the like. it can.
  • the relative speed ⁇ V1 is the relative speed of the preceding vehicle as viewed from HEV, and the traveling direction is positive. That is, when the vehicle speed of HEV is faster than the vehicle speed of the preceding vehicle, the relative speed ⁇ V1 is a negative value.
  • the control device 80 acquires the relative relationship acquired by the relative relationship acquisition device 85. Based on R1, only the regenerative braking force B5 by the motor generator 31 is increased, and the total braking force B1 is controlled to be larger than the required braking force B2.
  • the control device 80 includes a CPU that performs various processes, an internal storage device that can read and write programs and processing results used to perform the various processes, and various interfaces.
  • the control device 80 is connected to the hybrid system 30 (the engine 10 and the inverter 35), the drum brake 92, and the relative relationship acquisition device 85 through signal lines.
  • the control device 80 also includes an accelerator opening sensor 96 that detects the amount of depression of the accelerator pedal 95 (accelerator opening) via a signal line, and a brake opening that detects the amount of depression of the brake pedal 90 (brake opening).
  • the sensor 97 is connected to a vehicle speed sensor 99 that detects the vehicle speed V1.
  • a plurality of execution programs are stored in the internal storage device.
  • As the execution programs a program for changing the total braking force B1 to the required braking force B2 based on the deceleration command C1, and a relative relationship R1.
  • a program for increasing the regenerative braking force B5 by the motor generator 31 can be exemplified.
  • step S10 the control device 80 receives a deceleration command C1.
  • the deceleration command C1 include an operation command by the driver's deceleration operation and a control command of the control device 80 in the auto cruise mode.
  • an accelerator off command C2 indicating that the accelerator pedal 95 of the accelerator opening sensor 96 is turned off, or a brake indicating an operation amount of the brake pedal 90 of the brake opening sensor 97 is displayed.
  • An operation command C3 can be exemplified.
  • examples of the control command include a coasting command C4 for setting the engine 10 in an idling state on a downhill road to maintain the target vehicle speed, a brake operation command C5 for the drum brake 92 when the vehicle speed exceeds the target vehicle speed, and the like.
  • an auxiliary brake such as an exhaust brake or a compression release brake
  • the auto-cruise mode is used especially when traveling on a highway, and the program stored in the control device 80 automatically schedules HEV when an unillustrated auto-cruise switch is turned on by the driver. It is a mode that runs on the street.
  • engine travel, assist travel, motor travel, and inertia travel are selected in a timely manner based on parameters such as the gradient of the travel path and the weight of the HEV, and the HEV vehicle speed is set in advance.
  • Examples include a mode in which the HEV is automatically driven while maintaining the speed range, and a mode in which the HEV is made to follow the preceding vehicle by appropriately selecting to follow the preceding vehicle.
  • step S20 the control device 80 calculates the required braking force B2 based on the deceleration command C1. Specifically, the required braking force B2 is calculated with reference to map data that has been created in advance through experiments and tests and stored in the internal storage device using the deceleration command C1 as a parameter.
  • the required braking force B2 is set to a braking force corresponding to the engine brake according to the vehicle speed of HEV.
  • the brake operation command C3 or the brake operation command C5 is received in step S10, the braking force is set according to the brake opening degree or the instructed instruction operation amount.
  • FIG. 3 is map data illustrating the correlation between the brake opening (instructed operation amount) and the required braking force B2. As shown in FIG. 3, the brake opening degree (instructed operation amount) and the required braking force B2 have a positive correlation.
  • the required braking force B2 may be increased or decreased in accordance with the HEV vehicle weight or the road gradient. Specifically, the vehicle weight and the gradient are acquired as parameters, and the increase / decrease amount of the required braking force B2 is calculated with reference to map data that is created in advance by experiments and tests and stored in the internal storage device.
  • FIG. 4 is map data exemplifying the correlation between the gradient of the traveling road and the increase amount of the required braking force B2 when the vehicle weight is a predetermined value.
  • the solid line is set to a predetermined vehicle weight M1
  • the dotted line is set to a vehicle weight M2 that is lighter than the vehicle weight M1
  • the alternate long and short dash line is set to a vehicle weight M3 that is heavier than the vehicle weight M1.
  • the vehicle weight and the increase amount thereof, and the gradient and the increase amount thereof have a positive correlation at a balance gradient ⁇ or more.
  • the balance gradient ⁇ is based on the HEV vehicle weight, and has a negative correlation with the vehicle weight. As the vehicle weight increases, the balance gradient ⁇ decreases.
  • the balance gradient ⁇ is a gradient in which the forward speed due to the gravitational acceleration applied to the HEV is equal to or greater than the running resistance, and the vehicle speed V1 does not decelerate even if the driving force of the engine 10 and the motor generator 31 is not applied.
  • As the balance gradient ⁇ for example, when the vehicle weight of HEV is 25 t, a gradient of 2% can be exemplified.
  • the HEV is a vehicle such as a bus, a truck, or a pickup truck
  • the vehicle weight varies greatly depending on the load and the number of passengers. Therefore, a balance gradient ⁇ and an increase amount corresponding to the vehicle weight should be set. Is desirable.
  • the regenerative electric energy of the motor generator 31 can be further increased when the vehicle weight is relatively heavy, which is advantageous in improving fuel consumption. Further, when the vehicle weight is relatively light, it is possible to avoid that the hybrid vehicle is excessively decelerated due to excessive braking force due to regeneration, which is advantageous in improving drivability.
  • a program for estimating the vehicle weight on the assumption that the driving force transmitted to the drive wheels 24 at the time of starting or shifting is equal to the running resistance can be exemplified.
  • a program that is calculated based on detection values of various sensors such as an acceleration sensor (G sensor), a wheel speed sensor, and a gyro sensor (not shown) and a navigation system (not shown) are registered.
  • step S30 the control device 80 performs control to change the total braking force B1 to the required braking force B2.
  • the total braking force B1 is any one or some of a resistance braking force B3 by the engine brake that stops the fuel injection of the engine 10, a friction braking force B4 by the drum brake 92, and a regenerative braking force B5 by the motor generator 31. This is the total braking force.
  • the total braking force B1 may include braking force by an auxiliary brake such as an exhaust brake, a compression release brake, and a retarder.
  • step S30 for example, when the accelerator off command C2 or the coasting command C4 is received in step S10, the regenerative braking force B5 is added to the resistance braking force B3 when the gradient of the travel path is larger than the balancing gradient ⁇ . Thus, the total braking force B1 is set to the required braking force B2. Further, when the brake operation command C3 or the brake operation command C5 is received in step S10, the friction braking force B4 corresponding to the brake opening degree (instructed operation amount) is added to the resistance braking force B3, and the total braking force B1 is obtained as the required braking force. Set to B2.
  • the regenerative braking force B5 is added to the resistance braking force B3, and the friction braking force B4 corresponding to the difference between them and the required braking force B2 is added.
  • the braking force B1 is set to the required braking force B2.
  • step S40 the relative relationship acquisition device 85 acquires the relative relationship R1 between the HEV and the preceding vehicle.
  • step S50 the control device 80 determines whether or not a condition is satisfied. This condition is established when the relative relationship R1 becomes the proximity relationship R2 where the friction braking force B4 by the drum brake 92 is expected to increase, assuming that the total braking force B1 is maintained at the required braking force B2.
  • the proximity relationship R2 is a relationship in which the friction braking force B4 by the drum brake 92 is expected to increase as the HEV and the preceding vehicle approach each other.
  • Examples of the proximity relationship R2 include a relationship in which the inter-vehicle distance L1 between the HEV and the preceding vehicle becomes the proximity distance L2, or the relative speed ⁇ V1 between the HEV and the preceding vehicle becomes the proximity speed ⁇ V2.
  • the proximity distance L2 is set according to the HEV vehicle speed V1, and when the vehicle speed V1 is 60 km / h or less, a distance obtained by subtracting a predetermined value from the value of the vehicle speed V1 (for example, the vehicle speed is 40 km / h, the predetermined speed). When the vehicle speed V1 exceeds 60 km / h, the proximity distance L2 is approximately the same as the vehicle speed V1 (for example, the vehicle speed is 80 km / h). Can be exemplified by 80 m).
  • the proximity speed ⁇ V2 can be exemplified as ⁇ 10 km / h or less when the inter-vehicle distance L1 is equal to or less than the proximity distance L2.
  • the proximity speed ⁇ V2 is preferably increased or decreased according to the inter-vehicle distance L1. For example, the proximity speed ⁇ V2 is decreased (approached to zero) each time the inter-vehicle distance L1 is equal to or smaller than the proximity distance L2 and the inter-vehicle distance L1 is reduced.
  • step S50 If it is determined in step S50 that the condition is not satisfied, the process returns to the start. On the other hand, when the condition is satisfied, that is, when it is determined that the relative relationship R1 becomes the proximity relationship R2 when the total braking force B1 is maintained in the current state, the process proceeds to step S60.
  • step S60 the control device 80 calculates an increase amount ⁇ B of the regenerative braking force B5 by the motor generator 31.
  • the increase amount ⁇ B is calculated with reference to map data that has been created in advance through experiments and tests using the vehicle speed V1, the inter-vehicle distance L1, and the relative speed ⁇ V1 as parameters, and stored in the internal storage device.
  • FIG. 5 is map data illustrating the relationship between the inter-vehicle distance L1 and the increase amount ⁇ B when the vehicle speed V1 is a predetermined speed.
  • FIG. 6 is map data illustrating the relationship between the relative speed ⁇ V1 and the increase amount ⁇ B when the inter-vehicle distance L1 is equal to or less than the proximity distance L2.
  • the vehicle speed V1 and the inter-vehicle distance L1 have a positive correlation.
  • the inter-vehicle distance L1 and the increase amount ⁇ B have a negative correlation, and the relative speed ⁇ V1 and the increase amount ⁇ B. And negative correlation.
  • step S70 the control device 80 increases the regenerative braking force B5 of the motor generator 31 by the calculated increase amount ⁇ B.
  • step S70 the process returns to the start, and steps S10 to S70 are repeated until the HEV travel stops.
  • FIG. 7 illustrates the relationship between each deceleration command C1 and the total braking force B1 after increasing the regenerative braking force B5.
  • the HEV is decelerated more than the degree of deceleration generated by the deceleration command C1, but after the deceleration command C1 is issued, only the regenerative braking force B5 of the motor generator 31 is increased based on the relative relationship R1.
  • the deceleration command C1 can give an impression that the relative relationship R1 between the HEV and the preceding vehicle is appropriately maintained so as not to become the proximity relationship R2.
  • the driver does not feel unintended deceleration, and drivability can be improved.
  • the regenerative power generation amount of the motor generator 31 can be increased by increasing only the regenerative braking force B5 of the motor generator 31.
  • the relative relationship R1 between the HEV and the preceding vehicle becomes the proximity relationship R2
  • the energy lost by the frictional braking force B4 by the drum brake 92 is converted into electric energy by regeneration, so that high fuel is used.
  • Opportunities for charging the voltage battery 32 can be reduced.
  • the opportunity to assist the motor generator 31 can be increased.
  • the regenerative power generation amount of the motor generator 31 can be increased without causing the driver to feel uncomfortable during the deceleration of the HEV, so that the fuel efficiency can be improved.
  • the regenerative braking force B5 by the motor generator 31 can be increased even in an HEV that does not have a coordinated regenerative system that is complicated in control and high in cost.
  • the amount can be increased.
  • the hybrid vehicle of the present disclosure is useful in that the amount of regenerative power generation of the motor generator can be increased and fuel consumption can be improved without causing the driver to feel uncomfortable during the deceleration of the hybrid vehicle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Automation & Control Theory (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Regulating Braking Force (AREA)

Abstract

Selon l'invention, si un ordre de décélération (C1) est délivré et que la force de freinage totale (B1) est réglée jusqu'à la force de freinage demandée (B2) sur la base de l'ordre de décélération (C1), ce véhicule hybride est configuré de telle manière qu'un dispositif de commande (80) effectue une commande pour établir la force de freinage totale (B1) de façon à être supérieure à la force de freinage demandée (B2) par augmentation de la seule force de freinage par récupération (B5) générée par un moteur-générateur (31) sur la base de la relation relative (R1) acquise par un dispositif d'acquisition de relation relative (85).
PCT/JP2016/084347 2015-11-20 2016-11-18 Véhicule hybride et procédé de commande pour ce dernier WO2017086471A1 (fr)

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CN108349487A (zh) 2018-07-31

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