JP2015051676A - Control device and control method for hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate dragging torque of a whole motor drive system including a motor generator in an engine traveling mode using only driving force of an engine in a hybrid vehicle.SOLUTION: In a hybrid vehicle having an engine 1, a motor generator 20, an inverter 3 and a power storage device 4, in an engine travelling mode for performing a travelling control only by driving force of the engine 1, when the power storage amount of the power storage device 4 is equal to a predetermined amount or more, a current command value-calculating portion, on the basis of a torque command value, rotation speed of the motor generator 20 and an inverter input DC voltage value, arithmetically calculates a torque current command value and a weak field current command value which bring a load applied by the motor generator 20 to the engine 1 to zero, and a current command value correcting portion arithmetically calculates a torque current correction value and a weak field current correction value which bring a load applied by a motor driving system 2 other than the motor generator 20 to the engine 1 to zero.

Description

  The present invention relates to a control apparatus and control method for a hybrid vehicle used in a hybrid vehicle.

  The hybrid vehicle includes an engine, a motor generator, an inverter for driving the motor generator, and a power storage device that charges and discharges electric power with the motor generator via the inverter.

  Here, as one of hybrid vehicle systems, there is one in which an engine and a motor drive system are mechanically directly connected. Here, the motor drive system includes the motor generator, and a belt and a pulley that transmit the drive force of the motor generator to the drive shaft of the engine. In such an engine and motor drive system direct-coupled hybrid vehicle, in an engine running mode that uses only the driving force of the engine, losses such as iron loss generated in the motor generator, that is, drag torque in the deceleration direction with respect to the engine output occurs. .

  In order to solve such a problem, there is a type in which a torque for canceling the drag torque of the motor generator alone is generated in the motor generator, and zero torque control is performed so that the drag torque of the motor generator does not disturb the engine output (patent) Reference 1).

  However, rotation resistance, that is, mechanical output (load) in the deceleration direction with respect to engine output is also generated in mechanical elements such as belts and pulleys constituting the motor drive system. Therefore, even if the zero torque control for canceling the drag torque of the motor generator alone as described in Patent Document 1 is performed, the motor drive system as a whole generates an output in the deceleration direction with respect to the engine output, There is a problem of loading the engine.

JP2013-49359A

  Accordingly, the present invention has been made to solve the above-described problems, and includes a motor generator and a mechanical element for directly connecting the motor generator and the engine in an engine travel mode that uses only the driving force of the engine in a hybrid vehicle. The main problem is to make the drag torque of the motor drive system to be zero and not apply a load to the engine.

  That is, the hybrid vehicle control device according to the present invention includes an engine, a motor generator, an inverter for driving the motor generator, and a power storage device that charges and discharges electric power between the motor generator via the inverter. For a hybrid vehicle that switches between a hybrid travel mode in which travel control is performed using the driving force of the engine and the motor generator, and an engine travel mode in which travel control is performed using only the driving force of the engine A torque current input to the inverter based on a torque command value indicating a torque to be output by the motor generator, a rotation speed of the motor generator, and an inverter input DC voltage value input to the inverter. Command value and field of weakness A current command value calculation unit for calculating a current command value, and a torque current correction value to be added to the torque current command value and the field weakening current command value based on the rotation speed of the motor generator and the inverter input DC voltage value And a current command value correction unit that calculates a field weakening current correction value, and in the engine running mode, when the storage amount of the power storage device is a predetermined value or more, the current command value calculation unit Calculates a torque current command value and a field weakening current command value that make the load applied to the engine zero, and the current command value correction unit sets the load applied to the engine by a motor drive system other than the motor generator to zero. And calculating a torque current correction value and a field weakening current correction value.

  If this is the case, based on the rotational speed of the motor generator and the inverter input DC voltage value, the current command value calculation unit causes the torque current command value to zero the load applied to the engine by the motor generator. And the field command current correction value is calculated, and the current command value correction unit calculates a torque current correction value and a field weakening current correction value that make a load applied to the engine by a motor drive system other than the motor generator zero. Therefore, it is possible to cancel the drag torque of the motor generator and the motor drive system and not apply a load to the engine. Further, since the torque current correction value and the field weakening current correction value are added to the torque current command value and the field weakening current command value, respectively, the motor generator can be driven with an optimum current value, A reduction in efficiency of the motor generator can be minimized.

Stores current correction value data indicating a torque current correction value and a field weakening current correction value, which are measured in advance for each rotation speed of the motor generator so that a load applied to the engine by a motor drive system other than the motor generator is zero. A current correction value data storage unit, wherein the current command value correction unit stores the current correction value data stored in the current correction value data storage unit based on the rotation speed of the motor generator and an inverter input DC voltage; Preferably, the torque current correction value and the field weakening current correction value are calculated.
In this case, since the torque current correction value and the field weakening current correction value are calculated using current correction value data measured in advance for each rotation speed of the motor generator, the load applied to the engine by the motor drive system Can be accurately zeroed, and the control content can be simplified.
Further, a command value indicating a correction value to be added to the torque current command value and the field weakening current command value, which is measured in advance for each rotation speed of the motor generator, so that the load applied to the engine by the motor generator is zero. A command value calculation correction data storage unit for storing calculation correction data is further provided, and the current command value calculation unit includes a torque command value, a rotation speed of the motor generator, and an inverter input DC voltage value input to the inverter. Preferably, the torque current command value and the field weakening current command value are calculated using the command value calculation correction data stored in the command value calculation correction data storage unit.
In this case, since the torque current command value and the field weakening current command value are calculated using the command value calculation correction data measured in advance for each rotation speed of the motor generator, the motor generator gives to the engine. The load can be reduced to zero with high accuracy and the control contents can be simplified.

It is desirable that the current command value correction unit is configured to calculate the torque current correction value and the field weakening current correction value when the storage amount of the power storage device is in a fully charged state.
If it is this, while being able to charge the said electrical storage apparatus without excess and deficiency, the overcharge of the said electrical storage apparatus can be prevented, and deterioration of the said electrical storage apparatus can be prevented.

  According to the present invention configured as described above, drag torque of a motor drive system including a motor generator and a mechanical element for directly connecting the motor generator and the engine in an engine travel mode using only the drive force of the engine in a hybrid vehicle. Can be made zero and no load is applied to the engine.

Schematic which shows the structure of the hybrid vehicle in this embodiment. The figure which shows the circuit structure of the control apparatus for hybrid vehicles in this embodiment. The figure which shows the relationship (an example) between the motor generator rotation speed in this embodiment, a torque current correction value, and a field weakening current correction value.

  An embodiment of a control apparatus for a hybrid vehicle according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the hybrid vehicle control device 100 according to the present embodiment includes an engine 1, a motor drive system 2 including a motor generator 20, an inverter 3 for driving the motor generator 20, and an inverter 3. Power storage device 4 that charges and discharges power to and from motor generator 20, auxiliary power system S 1 that supplies power to each auxiliary device 7 and DC auxiliary power supply 8 of the vehicle, and power running operation or regeneration of motor generator 20. The present invention is applied to a hybrid vehicle having a motor power system S2 to be operated.

  The auxiliary power system S1 includes a power storage device 4 (for example, a 48V lithium ion battery) serving as a DC main power source, a switch 5 (DC contactor) that opens and closes an electric circuit connected to the output terminal of the power storage device 4, and A smoothing capacitor 6 (DC link capacitor) provided downstream of the switch 5 and the smoothing capacitor 6 are connected to each auxiliary machine (for example, electric power steering, air conditioner, ECU, etc.) 7 of the vehicle, and This is a system for supplying power to a DC auxiliary power source (for example, 12V / 24V battery) 8. The auxiliary power system S1 includes a DC / DC converter 9, and each auxiliary machine 7 and DC auxiliary power supply 8 of the vehicle are connected in parallel to the output stage of the DC / DC converter 9. ing.

  The motor power system S2 is connected in parallel with the auxiliary machinery power system S1 via the smoothing capacitor 6, and performs the voltage conversion of the DC voltage from the power storage device 4 and the DC output from the voltage boosting circuit 10. And an inverter 3 that converts the voltage into an AC voltage and outputs the AC voltage to the motor generator 20.

  Here, the hybrid vehicle according to the present embodiment employs a parallel system that uses the power of the engine 1 and the motor generator 20 in parallel to drive the wheels. Specifically, as shown in FIG. 1, a drive shaft 11 of the engine 1 and a motor drive system 2 including a motor generator 20 and including a belt 21 and a pulley 22 are directly connected, and a clutch and the like are connected. A structure that is not provided and cannot be separated, that is, the engine 1 and the motor generator 20 are always mechanically connected.

  The hybrid vehicle control apparatus 100 that controls the hybrid vehicle uses an engine traveling mode M1 that performs traveling control using only the driving force of the engine 1, and the driving force of the motor generator 20 in addition to the driving force of the engine 1. This is used to switch between the hybrid traveling mode M2 that performs traveling control in an auxiliary manner.

  Specifically, as shown in FIG. 2, the hybrid vehicle control device 100 includes a current command value calculation unit 101 that calculates a torque current command value Cq and a field weakening current command value Cd that are input to the inverter 3, and a power storage device 4. Current command value correction unit 102 for calculating torque current correction value Rq and field weakening current correction value Rd to be added to torque current command value Cq and field weakening current command value when And an adder 103 that adds the torque current correction value Rq and the field weakening current correction value Rd to the torque current command value Cq and the field weakening current command value Cd.

  The current command value calculation unit 101 indicates the torque to be output by the motor generator 20, the torque command value input from the ECU (engine control unit), the rotation speed of the motor generator 20, and the DC voltage input to the inverter 3. The torque current command value Cq and the field weakening current command value Cd are calculated based on the inverter input DC voltage value which is a value.

  Specifically, current command value calculation unit 101 causes motor / generator 20 to generate a predetermined torque in accordance with the travel mode selected from engine travel mode M1 or hybrid travel mode M2. Torque current command value Cq and field weakening current command value Cd are calculated.

  More specifically, when the hybrid vehicle is traveling in the engine traveling mode M1, the current command value calculation unit 101 causes the motor generator 20 to perform regenerative operation when the amount of power stored in the power storage device 4 is equal to or less than a predetermined value. Thus, the torque current command value Cq and the field weakening current command value Cd are calculated. When the amount of electricity stored in power storage device 4 is equal to or greater than a predetermined value, for example, when the amount of electricity stored in power storage device 4 is fully charged, drag torque of motor generator 20 alone, that is, motor generator 20 alone is applied to engine 1. A torque current command value Cq and a field weakening current command value Cd are calculated so that the applied load becomes zero. Further, when the hybrid vehicle is traveling in the hybrid travel mode M2, the current command value calculation unit 101 generates a torque current for generating a predetermined torque so that the motor generator 20 assists the engine 1 (powering operation). The command value Cq and the field weakening current command value Cd are calculated.

  Here, when the current command value calculation unit 101 is traveling in the engine travel mode M1 and the amount of power stored in the power storage device 4 is equal to or greater than a predetermined value, for example, the amount of power stored in the power storage device 4 is in a fully charged state. In this case, the torque current command value Cq and the field weakening current command value Cd are calculated using the command value calculation correction data. Specifically, the correction data for command value calculation includes the torque current command value Cq and the field weakening current command value Cd so that the drag torque generated by the motor generator 20, that is, the load applied to the engine 1 by the motor generator 20 is zero. This is data indicating the command value to be added.

  The current command value correction unit 102 is when traveling in the engine travel mode M1 and the power storage amount of the power storage device 4 is equal to or greater than a predetermined value, for example, when the power storage amount of the power storage device 4 is in a fully charged state. Torque current correction value Rq and field weakening current correction to be added to torque current command value Cq and field weakening current command value Cd using current correction value data indicating torque current correction value Rq and field weakening current correction value Rd The value Rd is calculated. Then, as shown in FIG. 2, the torque current correction value Rq and the field weakening current correction value Rd calculated by the current command value correction unit 102 are input to the adder 103, and the adder 103 receives the torque current command value Cq and the weakening. The torque current correction value Rq and the field weakening current correction value Rd are added to the field current command value Cd.

  Here, the current correction value data includes the drag torque generated by the motor drive system 2 other than the motor generator 20, that is, the torque current correction value Rq and the field weakening current that make the load applied to the engine 1 by the motor drive system 2 zero. This is data indicating the correction value Rd. Specifically, the torque current correction value Rq and the mechanical loss (load) generated in mechanical elements other than the motor generator 20 constituting the motor drive system 2, for example, mechanical elements such as the belt 21 and the pulley 22 are set to zero. A field weakening current correction value Rd is set.

  The torque current correction value Rq and the field weakening current correction value Rd are individually set for each hybrid vehicle because the load applied to the engine 1 by the motor drive system 2 other than the motor generator 20 differs depending on the hybrid vehicle. It is.

  As an example of a method for setting the torque current correction value Rq and the field weakening current correction value Rd, as shown in FIG. 3, the motor generator 2 including the engine 1 and the motor generator 20 is mounted on the hybrid vehicle. A method is conceivable in which a load applied to the engine 1 by a motor drive system 2 other than 20 is measured for each rotation speed of the motor generator 20 and set based on the load.

  Here, the measured torque current correction value Rq and the field weakening current correction value Rd may be stored as tabular data indicating the relationship between the rotational speed of the motor generator 20 and each correction value, or a polynomial expression. It may be stored as approximate mathematical data.

  According to hybrid vehicle control apparatus 100 configured as described above, current command value calculation unit 101 has zero load applied to engine 1 by motor generator 20 alone, based on the rotational speed of motor generator 20 and the inverter input DC voltage value. Torque current command value Cq and field weakening current command value Cd are calculated so that the load applied to the engine 1 by the motor drive system 2 other than the motor generator 20 by the current command value correction unit 102 becomes zero. The current correction value Rq and the field weakening current correction value Rd are calculated, and the torque current command value Cq and the field weakening current command value Cd are added to the torque current correction value Rq and the field weakening current correction value Rd. It is possible to make the drag torque of both the generator 20 and the motor drive system 2 zero so that no load is applied to the engine 1. That. Further, since the torque current correction value Rq and the field weakening current correction value Rd are added to the torque current command value Cq and the field weakening current command value Cd, respectively, the motor generator 20 can be driven with an optimum current value. A decrease in efficiency of the motor generator 20 can be minimized.

Further, the current command value calculation unit 101 corrects the command value calculation that indicates the torque current command value Cq and the field weakening current command value Cd that are measured in advance so that the load applied to the engine 1 by the motor generator 20 is zero. Since the torque current command value Cq and the field weakening current command value Cd are calculated using the data, the load applied to the engine by the motor generator 20 can be accurately zeroed, and the control contents can be simplified. it can.
Similarly, the current command value correction unit 102 sets a preset current correction value indicating a torque current correction value Rq and a field weakening current correction value Rd that make the load applied to the engine 1 by the motor drive system 2 zero. Since the torque current correction value Rq and the field weakening current correction value Rd are calculated using the data, the load applied to the engine 1 by the motor drive system 2 can be accurately zeroed, and the control contents are simplified. be able to.

  Furthermore, when the amount of power stored in the power storage device 4 is in a fully charged state, the current command value calculation unit 101 sets the torque current command value Cq and the motor command 20 so that the load applied to the engine 1 by the motor generator 20 and the motor drive system 2 becomes zero. The field weakening current command value Cd is calculated, and the current command value correction unit 102 calculates the torque current correction value Rq and the field weakening current correction value Rd, so that the power storage device 4 can be charged without excess or deficiency, Overcharging of the power storage device 4 can be prevented, and deterioration of the power storage device 4 can be prevented.

The present invention is not limited to the above embodiment.
For example, the current command value calculation unit 101 calculates the torque current command value Cq and the field weakening current command value Cd so that the load applied to the engine 1 by the motor generator 20 and the motor drive system 2 becomes zero, and the current command value The correction unit 102 calculates the torque current correction value Rq and the field weakening current correction value Rd not only when the storage amount of the power storage device 4 is in a fully charged state, but the motor generator 20 drives the engine 1. Can be widely applied when power is not assisted.

  The hybrid vehicle to which the hybrid vehicle control device 100 is applied includes a drive shaft 11 of the engine 1 and a motor drive system 2 that includes a motor generator 20 and includes a belt 21, a pulley 22, and the like. However, the engine 1 and the motor drive system 2 can be mechanically separated, for example, by providing a clutch or the like.

  Further, the motor power system S2 is not limited to the one having the booster circuit 10, and may have a configuration without the booster circuit 10.

In addition, the command value calculation correction data may be stored in a dedicated command value calculation correction data storage unit (not shown), or may be stored in the current command value calculation unit 101.
Similarly, the current correction value data may be stored in a dedicated current correction value data storage unit (not shown) or may be stored in the current command value correction unit 102.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Hybrid vehicle control apparatus 1 ... Engine 11 ... Drive shaft 2 ... Motor drive system 20 ... Motor generator 21 ... Belt 22 ... Pulley 3 ... Inverter 4・ ・ Power storage device 5 ・ ・ ・ Switch 6 ・ ・ ・ Smoothing capacitor 7 ・ ・ ・ Auxiliary machine 8 ・ ・ ・ DC auxiliary power supply 9 ・ ・ ・ DC / DC converter 10 ・ ・ ・ Boost circuit 101 ・ ・ ・ Current command value calculation Unit 102 ... Current command value correction unit

Claims (4)

In a hybrid vehicle having an engine, a motor generator, an inverter for driving the motor generator, and a power storage device that charges and discharges electric power to and from the motor generator via the inverter, the engine and the motor A hybrid vehicle control device that switches between a hybrid travel mode in which travel control is performed using the driving force of a generator and an engine travel mode in which travel control is performed using only the driving force of the engine,
Based on the torque command value indicating the torque to be output by the motor generator, the rotation speed of the motor generator, and the inverter input DC voltage value input to the inverter, the torque current command value input to the inverter and the field weakening A current command value calculation unit for calculating a current command value;
A current command value for calculating a torque current correction value and a field weakening current correction value to be added to the torque current command value and the field weakening current command value based on the rotation speed of the motor generator and the inverter input DC voltage value A correction unit,
In the engine running mode, when the power storage amount of the power storage device is greater than or equal to a predetermined value, the current command value calculation unit causes a torque current command value and a field weakening current to zero the load that the motor generator applies to the engine. A hybrid vehicle control that calculates a command value, and wherein the current command value correction unit calculates a torque current correction value and a field weakening current correction value that make a load applied to the engine by a motor drive system other than the motor generator zero. apparatus. Stores current correction value data indicating a torque current correction value and a field weakening current correction value, which are measured in advance for each rotation speed of the motor generator so that a load applied to the engine by a motor drive system other than the motor generator is zero. A current correction value data storage unit;
The current command value correction unit uses the current correction value data stored in the current correction value data storage unit based on the number of revolutions of the motor generator, and uses the torque current correction value and the field weakening current correction value. The hybrid vehicle control device according to claim 1, wherein   3. The hybrid vehicle according to claim 1, wherein the current command value correction unit calculates the torque current correction value and the field weakening current correction value when the storage amount of the power storage device is in a fully charged state. Control device. In a hybrid vehicle having an engine, a motor generator, an inverter for driving the motor generator, and a power storage device that charges and discharges electric power to and from the motor generator via the inverter, the engine and the motor A hybrid vehicle control program for switching between a hybrid travel mode in which travel control is performed using a driving force of a generator and an engine travel mode in which travel control is performed using only the driving force of the engine,
Based on the torque command value indicating the torque to be output by the motor generator, the rotation speed of the motor generator, and the inverter input DC voltage value input to the inverter, the torque current command value input to the inverter and the field weakening A current command value calculation unit for calculating a current command value;
A current command value for calculating a torque current correction value and a field weakening current correction value to be added to the torque current command value and the field weakening current command value based on the rotation speed of the motor generator and the inverter input DC voltage value Provide the computer with a function as a correction unit,
In the engine running mode, when the power storage amount of the power storage device is greater than or equal to a predetermined value, the current command value calculation unit causes a torque current command value and a field weakening current to zero the load that the motor generator applies to the engine. A command value is calculated, and the current command value correction unit calculates a torque current correction value and a field weakening current correction value that make a load applied to the engine by a motor drive system other than the motor generator zero. A hybrid vehicle control program.