WO2012098743A1 - 回生制御装置、ハイブリッド自動車および回生制御方法、並びにプログラム - Google Patents
回生制御装置、ハイブリッド自動車および回生制御方法、並びにプログラム Download PDFInfo
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- WO2012098743A1 WO2012098743A1 PCT/JP2011/074130 JP2011074130W WO2012098743A1 WO 2012098743 A1 WO2012098743 A1 WO 2012098743A1 JP 2011074130 W JP2011074130 W JP 2011074130W WO 2012098743 A1 WO2012098743 A1 WO 2012098743A1
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- engine
- electric motor
- hybrid vehicle
- required torque
- improvement rate
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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
Definitions
- the present invention relates to a regeneration control device, a hybrid vehicle, a regeneration control method, and a program.
- the hybrid vehicle has an engine and an electric motor, and can be driven by the engine or the electric motor, or can be driven in cooperation with the engine and the electric motor.
- the motor is operated as a generator by being rotated by the rotational force of the wheel, and the battery of the hybrid vehicle can be charged (this is referred to as regenerative power generation).
- regenerative power generation a generator by being rotated by the rotational force of the wheel
- regenerative torque is generated in the electric motor in proportion to the regenerative electric power of the electric motor.
- This regenerative torque acts as a braking force when the hybrid vehicle is decelerated (see, for example, Patent Document 1).
- the engine rotation shaft and the motor rotation shaft are separated, the engine is separated from the traveling system of the hybrid vehicle, the braking force by the engine brake is eliminated, and the electric motor is Control is performed so that regenerative power generation can be performed with a regenerative torque of (that is, maximum regenerative power).
- the engine rotates autonomously in an idle state while the rotational shaft of the engine and the rotational shaft of the electric motor are separated. As a result, the engine consumes a small amount of fuel.
- the engine rotation shaft and the motor rotation shaft are connected at the time of deceleration, the engine can maintain its rotation without performing fuel injection, and therefore does not consume any fuel.
- the rotating shaft of the engine and the rotating shaft of the electric motor are connected, the friction of the magnitude obtained by adding the engine friction and the electric motor friction acts as a braking force, and the deceleration of the hybrid vehicle increases. The vehicle speed of the hybrid vehicle decreases without obtaining a regenerative electric power.
- both the fuel consumption of the engine and the regenerative power of the motor are affected by whether the engine rotation shaft and the motor rotation shaft are disconnected or connected.
- the present invention has been made under such a background, and can optimally determine whether to disconnect or connect the rotating shaft of the engine and the rotating shaft of the motor in the regenerative state during deceleration.
- An object is to provide a regeneration control device, a hybrid vehicle, a regeneration control method, and a program.
- the regenerative control device of the present invention includes an engine and an electric motor, and can be driven by the engine or the electric motor, or can be driven in cooperation with the engine and the electric motor, and regenerative power generation is performed by the electric motor at least during deceleration.
- the cargo loading amount is set in multiple stages for each of a plurality of travel patterns in advance.
- the fuel efficiency improvement rate is calculated based on the formula, and the calculated fuel efficiency improvement rate satisfies the predetermined condition.
- the Sutoki, and control means for controlling to perform regenerative power generation in a state where the rotary shaft are connected to each other in the rotating shaft of the electric motor of the engine, and has.
- the calculation formula can be obtained by varying the cargo loading amount in a plurality of stages for each of a plurality of travel patterns in a state where the engine rotation shaft and the motor rotation shaft are connected to each other during deceleration of the hybrid vehicle.
- the average value, the average value of the required torque, the variance value of the engine rotational speed, and the regression formula to the variance value of the required torque, and the control means is the engine rotation when traveling for a predetermined time during deceleration of the hybrid vehicle
- the average value of engine speed, average value of required torque, variance value of engine speed, and required torque The Chichi calculated, it is possible to calculate the fuel consumption improvement rate by substituting the calculation result in the regression equation.
- the holding means replaces the calculation formula with a plurality of cargo loading amounts in advance for each of a plurality of travel patterns in a state where the rotation shaft of the engine and the rotation shaft of the electric motor are connected to each other during deceleration of the hybrid vehicle.
- a neural network created based on the engine rotation speed, required torque, and fuel efficiency improvement rate when the vehicle travels for a predetermined time in variable stages is maintained, and the control means is an engine that travels for a predetermined time during deceleration of the hybrid vehicle.
- the fuel efficiency improvement rate can be calculated by inputting the rotation speed and the required torque into the neural network.
- the calculation formula can be obtained by varying the cargo loading amount in a plurality of stages for each of a plurality of travel patterns in a state where the engine rotation shaft and the motor rotation shaft are connected to each other during deceleration of the hybrid vehicle.
- the membership function is created based on the engine rotational speed, the required torque, and the fuel efficiency improvement rate when traveling, and the control means uses the engine rotational speed and the required torque when traveling for a predetermined time during deceleration of the hybrid vehicle as members.
- the fuel efficiency improvement rate can be calculated by substituting it into the ship function.
- Another aspect of the present invention is a viewpoint as a hybrid vehicle.
- the hybrid vehicle of the present invention has the regeneration control device of the present invention.
- Still another aspect of the present invention is a viewpoint as a regeneration control method.
- the regenerative control method of the present invention includes an engine and an electric motor, and can be driven by the engine or the electric motor, or can be driven in cooperation with the engine and the electric motor, and regenerative power generation is performed by the electric motor at least during deceleration.
- the cargo loading amount is set in multiple stages for each of a plurality of travel patterns in advance.
- the fuel efficiency improvement rate is calculated based on the formula and the calculated fuel efficiency improvement rate satisfies a predetermined condition.
- Still another aspect of the present invention is a viewpoint as a program.
- the program of the present invention causes the information processing apparatus to realize the function of the regeneration control device of the present invention.
- FIG. 1 is a block diagram showing an example of the configuration of the hybrid vehicle 1.
- the hybrid vehicle 1 is an example of a vehicle.
- the hybrid vehicle 1 is driven by an engine (internal combustion engine) 10 and / or an electric motor 13 via a transmission of a semi-automatic transmission, and generates a braking force such as an engine brake of the engine 10 by regenerative torque of the electric motor 13 during deceleration. be able to.
- the semi-automatic transmission is a transmission that can automatically perform a shifting operation while having the same configuration as a manual transmission.
- the hybrid vehicle 1 includes an engine 10, an engine ECU (Electronic Control Unit) 11, a clutch 12, an electric motor 13, an inverter 14, a battery 15, a transmission 16, an electric motor ECU 17, a hybrid ECU 18 (a regenerative control device in the claims, an internal memory 32) Means for holding the calculation formula in the claims), a wheel 19, a key switch 20, and a shift unit 21.
- the transmission 16 has the above-described semi-automatic transmission and is operated by a shift unit 21 having a drive range (hereinafter referred to as a D (Drive) range). When the shift unit 21 is in the D range, the shifting operation of the semi-automatic transmission is automated.
- the engine 10 is an example of an internal combustion engine, and is controlled by the engine ECU 11 to rotate gasoline, light oil, CNG (Compressed Natural Gas), LPG (Liquefied ⁇ Petroleum Gas), or alternative fuel and the like, and rotate the rotating shaft.
- the generated power is generated, and the generated power is transmitted to the clutch 12.
- the engine ECU 11 is a computer that operates in cooperation with the electric motor ECU 17 by following instructions from the hybrid ECU 18, and controls the engine 10 such as fuel injection amount and valve timing.
- the engine ECU 11 includes a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), a microprocessor (microcomputer), a DSP (Digital Signal Processor), and the like. O (Input / Output) port and the like.
- the clutch 12 is controlled by the hybrid ECU 18 and transmits the shaft output from the engine 10 to the wheels 19 via the electric motor 13 and the transmission 16. That is, the clutch 12 mechanically connects the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 under the control of the hybrid ECU 18 to transmit the shaft output of the engine 10 to the electric motor 13, or By disconnecting the mechanical connection between the rotating shaft of the motor 10 and the rotating shaft of the electric motor 13, the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 can be rotated at different rotational speeds.
- the clutch 12 causes the hybrid vehicle 1 to travel by the power of the engine 10, thereby causing the electric motor 13 to generate electric power, when the engine 10 is assisted by the driving force of the electric motor 13, and to start the engine 10 by the electric motor 13.
- the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 are mechanically connected.
- the clutch 12 is in a state where the engine 10 is stopped or idling and the hybrid vehicle 1 is running by the driving force of the electric motor 13 and when the engine 10 is stopped or idling and the hybrid vehicle 1 is decelerated.
- the mechanical connection between the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 is disconnected.
- the clutch 12 is different from the clutch that is operated by the driver operating the clutch pedal, and operates under the control of the hybrid ECU 18.
- the electric motor 13 is a so-called motor generator, which generates electric power for rotating the rotating shaft by the electric power supplied from the inverter 14 and supplies the shaft output to the transmission 16 or the rotation supplied from the transmission 16. Electricity is generated by the power that rotates the shaft, and the electric power is supplied to the inverter 14. For example, when the hybrid vehicle 1 is accelerating or traveling at a constant speed, the electric motor 13 generates power for rotating the rotating shaft, and supplies the shaft output to the transmission 16. The hybrid vehicle 1 is driven in cooperation with the vehicle. Further, for example, when the electric motor 13 is driven by the engine 10, or when the hybrid vehicle 1 is decelerating or traveling downhill, the electric motor 13 operates as a generator.
- the power is generated by the power that rotates the rotating shaft supplied from the transmission 16, the electric power is supplied to the inverter 14, and the battery 15 is charged.
- the electric motor 13 generates a regenerative torque having a magnitude corresponding to the regenerative power.
- the inverter 14 is controlled by the electric motor ECU 17 and converts the DC voltage from the battery 15 into an AC voltage, or converts the AC voltage from the electric motor 13 into a DC voltage.
- the inverter 14 converts the DC voltage of the battery 15 into an AC voltage and supplies electric power to the electric motor 13.
- the inverter 14 converts the AC voltage from the electric motor 13 into a DC voltage. That is, in this case, the inverter 14 serves as a rectifier and a voltage regulator for supplying a DC voltage to the battery 15.
- the battery 15 is a chargeable / dischargeable secondary battery.
- the electric power is supplied to the electric motor 13 via the inverter 14 or when the electric motor 13 is generating electric power, It is charged by the power it generates.
- the battery 15 has a range of an appropriate state of charge (hereinafter referred to as SOC (State-of-Charge)), and is managed so that the SOC does not deviate from the range.
- SOC State-of-Charge
- the transmission 16 has a semi-automatic transmission (not shown) that selects one of a plurality of gear ratios (speed ratios) in accordance with a speed change instruction signal from the hybrid ECU 18.
- the power and / or power of the electric motor 13 is transmitted to the wheel 19. Further, the transmission 16 transmits the power from the wheels 19 to the electric motor 13 when decelerating or traveling downhill.
- the driver can manually change the gear position to an arbitrary gear stage by operating the shift unit 21.
- the electric motor ECU 17 is a computer that operates in cooperation with the engine ECU 11 according to an instruction from the hybrid ECU 18, and controls the electric motor 13 by controlling the inverter 14.
- the electric motor ECU 17 is configured by a CPU, an ASIC, a microprocessor (microcomputer), a DSP, and the like, and has an arithmetic unit, a memory, an I / O port, and the like.
- the hybrid ECU 18 is an example of a computer, and for hybrid traveling, accelerator opening information, brake operation information, vehicle speed information, gear position information acquired from the transmission 16, engine rotation speed information acquired from the engine ECU 11, and a battery 15
- the clutch 12 is controlled on the basis of the SOC information acquired from the control information, and the transmission 16 is controlled by supplying a shift instruction signal.
- the control instruction for the motor 13 and the inverter 14 is given to the motor ECU 17, and the engine ECU 11 is given control.
- the control instruction of the engine 10 is given.
- These control instructions include a regenerative control instruction to be described later.
- the hybrid ECU 18 includes a CPU, an ASIC, a microprocessor (microcomputer), a DSP, and the like, and has an arithmetic unit, a memory, an I / O port, and the like.
- the program executed by the hybrid ECU 18 can be installed in advance in the hybrid ECU 18 that is a computer by storing the program in a nonvolatile memory inside the hybrid ECU 18 in advance.
- the engine ECU 11, the electric motor ECU 17, and the hybrid ECU 18 are connected to each other by a bus that conforms to a standard such as CAN (Control Area Network).
- CAN Controller Area Network
- Wheel 19 is a driving wheel that transmits driving force to the road surface. Although only one wheel 19 is shown in FIG. 1, the hybrid vehicle 1 actually has a plurality of wheels 19.
- the key switch 20 is a switch that is turned on / off by a user, for example, when a key is started. When the key switch 20 is turned on, each part of the hybrid vehicle 1 is activated and the key switch 20 is turned off. Each part of the hybrid vehicle 1 is stopped by entering the state.
- the shift unit 21 gives an instruction from the driver to the semi-automatic transmission of the transmission 16, and when the shift unit 21 is in the D range, the shifting operation of the semi-automatic transmission is automated.
- FIG. 2 is a block diagram illustrating an example of a functional configuration realized in the hybrid ECU 18 that executes the program. That is, when the hybrid ECU 18 executes the program, the function of the regeneration control unit 30 (control means in the claims) is realized.
- the calculation formula holding unit 31 (means for holding the calculation formula in the claims) is a storage area that holds a calculation formula for reference by the regenerative control unit 30, and is a part of the memory 32 included in the hybrid ECU 18. This can be realized by allocating a storage area.
- This calculation formula is a regression formula for deriving the fuel efficiency improvement rate from the average value and variance value of the engine rotation speed calculated from the engine rotation speed and the average value and variance value of the request torque calculated from the request torque, Details thereof will be described later.
- the fuel efficiency improvement rate is a state in which the rotation shaft of the engine 10 and the rotation shaft of the electric motor 13 are connected to each other during the deceleration of the hybrid vehicle 1 (that is, the clutch 12 is in a contact state), and a plurality of driving patterns in advance.
- the rotating shaft of the engine 10 and the rotating shaft of the electric motor 13 are disconnected (that is, the clutch 12 is disconnected). )
- the fuel consumption is compared in advance for each of the plurality of travel patterns when the cargo loading amount is changed in a plurality of stages and the vehicle travels for a predetermined time.
- the fuel efficiency improvement rate is, for example, a negative value, and conversely, the clutch 12 is in the disconnected state. If the fuel consumption clutch 12 is improved than the fuel economy of the contact state, the fuel economy improvement ratio, for example a positive value.
- Such fuel consumption comparison is carried out by the manufacturer of the hybrid vehicle 1 performing a test drive on a predetermined route with each driving pattern.
- the regression equation described below is created based on the result of a test run performed by the manufacturer of such a hybrid vehicle 1. If this regression equation is used, the fuel efficiency improvement rate can be calculated if the engine speed and the required torque are known without knowing the cargo load amount and travel pattern of the hybrid vehicle 1. In FIG. 4, the fuel efficiency improvement rate is described as (F / E: Fuel improvement Effect rate).
- the regenerative control unit 30 regenerates the engine ECU 11, the clutch 12, and the electric motor ECU 17 based on the engine rotational speed information, the accelerator opening information, the vehicle speed information, the motor control information, and the calculation formula held in the calculation formula holding unit 31. This is a function for instructing control.
- step S1 the key switch 20 is in the ON state, the hybrid ECU 18 executes the program, and the function of the regenerative control unit 30 is realized in the hybrid ECU 18, and the procedure proceeds to step S1.
- step S1 the regeneration control unit 30 determines whether or not the hybrid vehicle 1 is decelerating from the accelerator opening information and the vehicle speed information. That is, if the accelerator opening is 0 degrees from the accelerator opening information, the motor 13 is being regenerated from the motor control information, and the vehicle speed is decreasing from the vehicle speed information, the hybrid vehicle 1 is decelerating. If it is determined in step S1 that the hybrid vehicle 1 is decelerating, the procedure proceeds to step S2. On the other hand, if it is determined in step S1 that the hybrid vehicle 1 is not decelerating, the procedure repeats step S1.
- step S2 the regeneration control unit 30 acquires the engine rotation speed information and the required torque information within a predetermined period, calculates the average value and the variance value, and the procedure proceeds to step S3.
- the regeneration control part 30 acquires a driver
- step S3 the regeneration control unit 30 holds the average value of the engine speed, the average value of the required torque, the variance value of the engine speed, and the variance value of the required torque calculated in step S2 in the calculation formula holding unit 31. If the value is substituted into a regression equation (described later in FIG. 4), the procedure proceeds to step S4.
- step S4 the regeneration control unit 30 proceeds to the procedure of step S5 after calculating the fuel efficiency improvement rate from the regression equation.
- step S5 the regeneration control unit 30 determines whether or not the fuel efficiency improvement rate is equal to or greater than a threshold value. If it is determined in step S5 that the fuel improvement rate is equal to or greater than the threshold value, the procedure proceeds to step S6. On the other hand, if it is determined in step S5 that the fuel improvement rate is less than the threshold value, the procedure proceeds to step S7. This threshold will be described later.
- step S6 the regeneration control unit 30 performs regeneration by the electric motor 13 with the clutch 12 in the engaged state, and ends the process for one cycle (END).
- step S7 the regeneration control unit 30 performs regeneration by the electric motor 13 with the clutch 12 disengaged, and ends the processing for one cycle (END).
- Patterns # 1, # 2, # 3 and # 4 in FIG. 4 are travel patterns of the hybrid vehicle 1. For example, pattern # 1 is general road driving, pattern # 2 is highway driving, pattern # 3 is congestion road driving, pattern # 4 is city road driving, and the like.
- the vehicle weight is the total weight of the hybrid vehicle 1 and is A ⁇ B ⁇ C ⁇ D ⁇ E (unit: tons, etc.). Note that the various data in FIG. 4 are data for one vehicle type, and the difference in the total weight is due to, for example, the difference in the weight of the loaded cargo.
- the various data shown in FIG. 4 indicate that the hybrid vehicle 1 is made to run for a predetermined period of time with each vehicle weight A, B, C, D, E in each pattern # 1, # 2, # 3, # 4.
- the average value of the engine speed, the average value of the required torque, the variance value of the engine speed, the variance value of the required torque, and the fuel efficiency improvement rate are tabulated.
- the coefficients a, b, c, d of the regression equation are calculated so that when a predetermined numerical value is substituted for each variable W, X, Y, Z, a predetermined fuel efficiency improvement rate is calculated.
- Each is decided.
- the regression equation and its creation method are well-known matters, and detailed description thereof is omitted.
- the hybrid vehicle 1 acquires engine rotation speed information and required torque information (according to accelerator opening information) by holding the regression equation thus created in the calculation formula holding unit 31 of the regeneration control unit 30.
- the fuel efficiency improvement rate F / E
- the fuel efficiency improvement rate indicates that the fuel efficiency is improved as the numerical value described in the column of the fuel efficiency improvement rate in FIG. 4 is larger. Therefore, for example, the threshold value is set to “0”, clutch engagement regeneration is performed when the threshold value is a positive number that is greater than or equal to “0” or greater, and clutch disconnection regeneration is performed when the threshold value is a negative number that is less than or less than “0”. Control to implement. In addition, for example, the threshold value is set to “2” and the clutch engagement / regeneration is performed only when the fuel consumption improvement rate is very good. The threshold value may be set based on the user's various vehicle operation policies. it can.
- FIG. 5 is a conceptual diagram of a neural network that inputs an engine speed and a required torque and outputs a fuel efficiency improvement rate.
- a neural network may be created and held in the calculation formula holding unit 31 of the regeneration control unit 30.
- the method for creating the neural network is similar to the regression equation described above, in which the hybrid vehicle 1 is subjected to the vehicle weights A, B, C, D, E in the patterns # 1, # 2, # 3, and # 4.
- a neural network is created so that the fuel efficiency improvement rate is calculated from the engine speed and the required torque at that time.
- the creation method is a well-known matter and will not be described in detail. In this case, in the procedure of step S2 in the flowchart of FIG.
- step S3 it is not necessary to acquire engine rotation speed information and required torque information within a predetermined period and calculate the average value and the variance value.
- the processing can be simplified by acquiring the engine rotation speed information and the required torque information within the period and using the “input to the neural network” instead of “substitute into the regression equation” in step S3 as it is.
- membership functions used in fuzzy inference may be used instead of regression equations.
- the membership function is created in the same manner as the regression equation described above, with the hybrid vehicle 1 having the respective vehicle weights A, B, C, D, in each of the patterns # 1, # 2, # 3, and # 4.
- a membership function is created so that the fuel efficiency improvement rate is calculated from the engine speed and the required torque at that time when the vehicle is run on a trial basis for a predetermined period at E.
- the creation method is a well-known matter and will not be described in detail. In this case, in the procedure of step S2 in the flowchart of FIG. 3, it is not necessary to acquire engine rotation speed information and required torque information within a predetermined period and calculate the average value and the variance value.
- the processing can be simplified by acquiring the engine rotation speed information and the required torque information within the period and using “substitute into membership function” instead of “substitute into regression equation” in step S3.
- the determination boundary value may be variously changed such that “above” is “exceeded” and “less than” is “below”.
- the engine 10 has been described as an internal combustion engine, it may be a heat engine including an external combustion engine.
- the program executed by the hybrid ECU 18 has been described as being installed in the hybrid ECU 18 in advance.
- a removable medium in which the program is recorded (a program is stored) is attached to a drive or the like (not shown), and the removable medium is removed.
- the program read from the medium is stored in a non-volatile memory inside the hybrid ECU 18 or the program transmitted via a wired or wireless transmission medium is received by a communication unit (not shown), and the hybrid ECU 18 Can be installed in the hybrid ECU 18 as a computer.
- each ECU may be realized by an ECU in which these are combined into one, or an ECU that further subdivides the functions of each ECU may be provided.
- the program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.
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Abstract
Description
以上説明したように、燃費の向上がある程度見込まれる状況下では、減速時にクラッチ12を接続して電動機13の回生を実施することができる。これによれば、電動機13の回生の効率は低下するもののエンジン10の燃料の消費量が減るので、総合的に見た場合、ハイブリッド自動車1の消費エネルギを低減させることができる。また、回帰式に代入するための情報は、エンジン回転速度情報および要求トルク情報のみであるため、別途にセンサ類を取り付けるなどの必要が無く、装置の構成が簡単であると共にコストを低く抑えることができる。
図5は、エンジン回転速度および要求トルクを入力し、燃費向上率を出力するニューラルネットワークの概念図である。このようなニューラルネットワークを作成し、これを回生制御部30の算出式保持部31に保持してもよい。なお、ニューラルネットワークの作成方法は、上述の回帰式と同様に、ハイブリッド自動車1をそれぞれのパターン#1,#2,#3,#4において、それぞれの車両重量A,B,C,D,Eで試験的に所定期間走行させ、そのときのエンジン回転速度および要求トルクから燃費向上率が算出されるようにニューラルネットワークを作成する。その作成手法については周知の事項であり、詳細な説明は省略する。この場合、図3のフローチャートにおけるステップS2の手続きにおいて、所定期間内のエンジン回転速度情報および要求トルク情報を取得してその平均値および分散値を計算する必要が無く、ステップS2の手続きとして、所定期間内のエンジン回転速度情報および要求トルク情報を取得してそのままステップS3の「回帰式に代入」に代えて「ニューラルネットワークに入力」とすることにより、処理を単純化することができる。
Claims (7)
- エンジンと電動機とを有し、前記エンジンもしくは前記電動機により走行可能であり、または前記エンジンと前記電動機とが協働して走行可能であり、少なくとも減速中に、前記電動機により回生発電が可能であるハイブリッド自動車の回生制御装置において、
前記ハイブリッド自動車の減速中に前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で、予め複数の走行パターンのそれぞれについて貨物積載量を複数段階に可変して所定時間走行したときのエンジン回転速度および要求トルクから燃費向上率を算出する算出式を保持する手段と、
前記ハイブリッド自動車の減速時に、所定時間走行したときのエンジン回転速度および要求トルクと前記算出式とに基づいて前記燃費向上率を算出し、その結果算出された前記燃費向上率が所定の条件を満たすときには、前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で回生発電を実施するように制御する制御手段と、
を有する、
ことを特徴とする回生制御装置。 - 請求項1記載の回生制御装置であって、
前記算出式は、前記ハイブリッド自動車の減速中に前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で、予め複数の走行パターンのそれぞれについて貨物積載量を複数段階に可変して所定時間走行したときのエンジン回転速度の平均値、要求トルクの平均値、エンジン回転速度の分散値、要求トルクの分散値、およびそのときの燃費向上率に基づき作成された前記燃料向上率の前記エンジン回転速度の平均値、前記要求トルクの平均値、前記エンジン回転速度の分散値、および前記要求トルクの分散値への回帰式であり、
前記制御手段は、前記ハイブリッド自動車の減速時に、所定時間走行したときのエンジン回転速度および要求トルクから前記エンジン回転速度の平均値、前記要求トルクの平均値、前記エンジン回転速度の分散値、および前記要求トルクの分散値を計算し、この計算結果を前記回帰式に代入して前記燃費向上率を算出する、
ことを特徴とする回生制御装置。 - 請求項1記載の回生制御装置であって、
前記保持する手段、前記算出式に代えて、前記ハイブリッド自動車の減速中に前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で、予め複数の走行パターンのそれぞれについて貨物積載量を複数段階に可変して所定時間走行したときのエンジン回転速度、要求トルク、および燃費向上率に基づき作成されたニューラルネットワークを保持し、
前記制御手段は、前記ハイブリッド自動車の減速時に、所定時間走行したときのエンジン回転速度および要求トルクを前記ニューラルネットワークに入力して前記燃費向上率を算出する、
ことを特徴とする回生制御装置。 - 請求項1記載の回生制御装置であって、
前記算出式は、前記ハイブリッド自動車の減速中に前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で、予め複数の走行パターンのそれぞれについて貨物積載量を複数段階に可変して所定時間走行したときのエンジン回転速度、要求トルク、および燃費向上率に基づき作成されたメンバシップ関数であり、
前記制御手段は、前記ハイブリッド自動車の減速時に、所定時間走行したときのエンジン回転速度および要求トルクを前記メンバシップ関数に代入して前記燃費向上率を算出する、
ことを特徴とする回生制御装置。 - 請求項1から4のいずれか1項記載の回生制御装置を有することを特徴とするハイブリッド自動車。
- エンジンと電動機とを有し、前記エンジンもしくは前記電動機により走行可能であり、または前記エンジンと前記電動機とが協働して走行可能であり、少なくとも減速中に、前記電動機により回生発電が可能であるハイブリッド自動車の回生制御方法において、
前記ハイブリッド自動車の減速中に前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で、予め複数の走行パターンのそれぞれについて貨物積載量を複数段階に可変して所定時間走行したときのエンジン回転速度および要求トルクと燃費向上率との関係を表す算出式を保持し、
前記ハイブリッド自動車の減速時に、所定時間走行したときのエンジン回転速度および要求トルクと前記算出式とに基づいて前記燃費向上率を算出し、その結果算出された前記燃費向上率が所定の条件を満たすときには、前記エンジンの回転軸と前記電動機の回転軸とが互いに接続された状態で回生発電を実施するように制御する制御ステップを有する、
ことを特徴とする回生制御方法。 - 情報処理装置に、請求項1から4のいずれか1項記載の回生制御装置の機能を実現させることを特徴とするプログラム。
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