Control device for hybrid vehicle

Abstract

To stabilize AC voltage which is output by a hybrid vehicle.SOLUTION: An electronic control unit 40, which performs feed-back control of electricity generation / powering electricity of a motor generator 25, sets, as a target voltage range, a range narrower than a usual range during output of an AC voltage of an AC inverter 23 in order to set a voltage of a power supply line 21 connected to a battery 20 to a value in the target voltage range.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a control device for a hybrid vehicle. [Background technology]

[0002] The hybrid vehicle described in Patent Document 1 is equipped with a power supply port for supplying power to external electrical devices. When the battery's charging rate is equal to or higher than a threshold, the hybrid vehicle supplies power stored in the battery to the external devices with the engine stopped. When the battery's charging rate is lower than the threshold, the hybrid vehicle operates the engine and supplies power generated by the engine to the external devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-67839 Summary of the Invention [Problem to be solved by the invention]

[0004] The voltage supplied to the AC inverter varies depending on the usage of the motor generator, and the AC voltage output by the AC inverter may also vary in response to the fluctuations in the supply voltage. [Means for solving the problem]

[0005] A control device for a hybrid vehicle that solves the above problem is a control device for a hybrid vehicle that includes an engine, a battery, a power line connected to the battery, a motor generator connected to the power line and capable of starting the engine, and an AC inverter that converts the DC voltage of the power line into an AC voltage and outputs it, and is configured to perform feedback control of the power running / regenerative torque of the motor generator so that the voltage of the power line is set to a value within a target voltage range, and to narrow the target voltage range when the AC inverter is outputting the AC voltage compared to when it is not outputting. [Effects of the Invention]

[0006] The control device for the hybrid vehicle has the effect of stabilizing the output of AC voltage. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a diagram illustrating a schematic configuration of an embodiment of a control device for a hybrid vehicle; [Figure 2] 4 is a flowchart of a process executed by the control device. [Figure 3] 10 is a graph showing a setting manner of a target voltage range. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of a control device for a hybrid vehicle will be described in detail below with reference to FIGS. <Configuration of a control device for a hybrid vehicle> First, the configuration of a control device for a hybrid vehicle according to this embodiment will be described with reference to Fig. 1. A hybrid vehicle 10 shown in Fig. 1 includes an engine 11 and a motor generator 25 as drive sources for traveling.

[0009] The hybrid vehicle 10 includes a battery 20 and a power supply line 21 connected to the battery 20. The motor generator 25 is connected to the power supply line 21. The motor generator 25 functions as both a generator that receives external power from the engine 11 or the like to generate electricity, and a motor that receives power supplied from the battery 20 via the power supply line 21 to generate traction torque. In this embodiment, the motor generator 25 also functions as a starter motor for starting the engine 11.

[0010] An AC inverter 23 is also connected to the power supply line 21. The AC inverter 23 converts the DC voltage of the power supply line 21 into AC voltage and outputs it to an AC outlet 26. The AC outlet 26 is an outlet through which the AC voltage is taken out to an external AC electrical device.

[0011] The hybrid vehicle 10 is further equipped with an electronic control unit 40 as a control device. The electronic control unit 40 includes an arithmetic processing device 41 and a storage device 42. The storage device 42 stores programs and data for vehicle control. The electronic control unit 40 performs various controls of the hybrid vehicle 10 by having the arithmetic processing device 41 execute programs read from the storage device 42. The control of the hybrid vehicle 10 performed by the electronic control unit 40 includes control of the engine 11, the motor generator 25, and the AC inverter 23. The electronic control unit 40 is connected to sensors and switches installed in various parts of the hybrid vehicle 10. The sensors and switches include a voltage sensor 43 and an AC switch 44. The voltage sensor 43 is a sensor that detects the voltage of the power supply line 21. The AC switch 44 is a switch that allows a passenger to manually turn on and off the output of AC voltage from the AC inverter 23 to the AC outlet 26. The electronic control unit 40 operates the AC inverter 23 in response to an ON operation of the AC switch 44, and stops the operation of the AC inverter 23 in response to an OFF operation of the AC switch 44.

[0012] <Power control of the motor generator 25> The electronic control unit 40 controls the power of the motor generator 25 as part of the control of the hybrid vehicle 10. The power control of the motor generator 25 will be described below.

[0013] 2 is a flowchart of the process executed by the electronic control unit 40 for power control of the motor generator 25. The electronic control unit 40 repeatedly executes the process of FIG. 2 at predetermined control intervals while the hybrid vehicle 10 is in operation.

[0014] When the process of FIG. 2 starts, the electronic control unit 40 first determines in step S100 whether the AC inverter 23 is outputting AC voltage. If the electronic control unit 40 determines that the AC inverter 23 is not outputting AC voltage (NO), the electronic control unit 40 sets a normal range as the target voltage range in step S110. If the electronic control unit 40 determines that the AC inverter 23 is outputting AC voltage (YES), the electronic control unit 40 sets a range narrower than the normal range as the target voltage range in step S120. After setting the target voltage range in step S110 or step S120, the electronic control unit 40 executes feedback control of the generated / powered running power of the motor generator 25 in step S130. The feedback control is performed by adjusting the generated / powered running power of the motor generator 25 so that the voltage of the power supply line 21 falls within the target voltage range. Specifically, in this feedback control, the electronic control unit 40 limits the generated power of the motor generator 25 so that the voltage of the power supply line 21 does not exceed the upper limit of the target voltage range. In addition, in this feedback control, the electronic control unit 40 limits the running power of the motor generator 25 so that the voltage of the power supply line 21 does not fall below the lower limit of the target voltage range. After processing step S130, the electronic control unit 40 ends the processing of FIG. 2 for the current control cycle.

[0015] 3 shows how the target voltage range is set in steps S110 and S120. In the following description, a state in which the AC inverter 23 is outputting an AC voltage will be referred to as "AC output on," and a state in which the AC inverter 23 is not outputting an AC voltage will be referred to as "AC output off." When the AC output is on, the electronic control unit 40 sets the target voltage range to a range with a lower limit of voltage E1 and an upper limit of voltage E4. When the AC output is off, the electronic control unit 40 sets the target voltage range to a range with a lower limit of voltage E2, which is higher than voltage E1, and an upper limit of voltage E3, which is lower than voltage E4 (E4>E3>E2>E1).

[0016] <Actions and Effects of the Embodiment> The operation and effects of the present embodiment configured as above will be described. When AC output is on, electronic control unit 40 sets a narrower range as the target voltage range than when AC output is off. In feedback control of the generated / running power of motor generator 25, the generated / running power of motor generator 25 is adjusted so that the DC voltage of power supply line 21 remains within the target voltage range as much as possible. Therefore, when AC output is on, fluctuations in the DC voltage of power supply line 21 are suppressed more than when AC output is off. Meanwhile, AC inverter 23 converts the DC voltage of power supply line 21 into AC voltage and outputs it to AC outlet 26. Therefore, if fluctuations in the DC voltage of power supply line 21 become smaller, fluctuations in the AC voltage output by AC inverter 23 also become smaller.

[0017] According to the control device for the hybrid vehicle 10 of the present embodiment described above, the following effects can be achieved. (1) The electronic control unit 40 sets the target voltage range in feedback control of the power generation / driving power of the motor generator 25 to a narrower range when the AC output is on than when the AC output is off. This suppresses fluctuations in the DC voltage of the power supply line 21 supplied to the AC inverter 23 when the AC is on, thereby suppressing fluctuations in the AC voltage output by the AC inverter 23. Therefore, the control device for the hybrid vehicle 10 of this embodiment has the effect of stabilizing the output of the AC voltage.

[0018] (2) It is also possible to stabilize the AC voltage output from AC inverter 23 by prohibiting the operation of motor generator 25 when AC output is on. However, in such a case, motor generator 25 cannot be operated at all when AC output is on. In contrast, in the present embodiment, even when AC output is on, motor generator 25 can continue to operate within a narrowed target voltage range so long as the voltage of power supply line 21 remains within that range.

[0019] <Modifications of the embodiment> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0020] The target voltage range when AC output is on may be set to a narrower range than the target voltage range when AC output is off by changing only one of the upper and lower limits of the target voltage range.

[0021] The AC output can be switched on and off automatically instead of manually. [Explanation of symbols]

[0022] 10 Hybrid vehicles 11 Engine 20 Battery 21 Power Line 23 AC inverter 25 Motor generator 26 AC outlets 40 Electronic Control Unit 41 Processing unit 42 Storage device 43 Voltage Sensor 44 AC switch

Claims

[Claim 1] A control device for a hybrid vehicle including an engine, a battery, a power supply line connected to the battery, a motor generator connected to the power supply line, and an AC inverter that converts a DC voltage of the power supply line into an AC voltage and outputs the AC voltage, A feedback control of the power generation / driving power of the motor generator is performed so that the voltage of the power supply line is set to a value within a target voltage range, and when the AC inverter is outputting the AC voltage, the target voltage range is narrowed compared to when the AC inverter is not outputting. A control device for a hybrid vehicle.

Images