JP2019093991A - Control device of vehicle - Google Patents

Abstract

To provide a control device of a vehicle which can suppress the deterioration of electricity economy at a heating operation.SOLUTION: This control device of a vehicle has a heater for heating the inside of a cabin by using at least either of the waste heat of an engine and the power of a battery, can travel by using only the power of the battery, and can travel by using an engine output and the power of the battery. The control device also comprises control means for controlling a motion point of the engine according to a requirement value of the engine output, and setting a threshold of a charge amount of the battery for starting the engine higher than that at a normal operation at which the heating operation is not performed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device of a vehicle.

  In Patent Document 1, when it is determined that there is a heating request, when there is remaining charge capacity of the battery, the SOC (State Of Charge) upper limit value of the battery is made larger than the normal upper limit value, and the operating point with good engine efficiency A control device for a vehicle is described which controls the operating point of the engine as the target operating point. When it is determined that the heating request is present, the control device sets the SOC upper limit value of the battery as the normal upper limit value when there is no battery charge remaining capacity, and the engine operating point with the engine efficiency poor operating point as the target operating point. Control. By controlling the operating point of the engine with the operating point at which the engine efficiency is low as the target operating point, the exhaust heat quantity of the engine is increased, so the heating operation can be performed using the exhaust heat of the engine.

JP, 2015-166204, A

  However, the vehicle control device described in Patent Document 1 has room for improvement in the setting of the charge amount of the battery at which the heating operation using the exhaust heat of the engine is started. That is, according to the control device for a vehicle described in Patent Document 1, the power consumption of the battery is consumed more than necessary before the heating operation using exhaust heat of the engine is started. It can be worse.

  This invention is made in view of the said subject, Comprising: The objective is to provide the control apparatus of the vehicle which can suppress that an electricity cost worsens at the time of heating operation.

  A control device for a vehicle according to the present invention includes a heating device for heating a vehicle compartment using at least one of exhaust heat of the engine and power of the battery, and travels using only the power of the battery, engine power and battery It is a control device of a vehicle capable of performing traveling using electric power, and controls the operating point of the engine according to the required value of the engine output during heating operation and is more than during normal operation when heating operation is not performed A control means is provided for setting the threshold of the charge amount of the battery for starting the engine high.

  The control means may increase the load of the engine while maintaining the engine speed constant if the required value of the engine output is less than the predetermined value. As a result, it is possible to suppress the occurrence of noise and vibration caused by the engine due to the increase in the number of revolutions of the engine.

  Further, the control means drives the engine to heat the vehicle interior using exhaust heat of the engine when the vehicle is at a stop, and compares the load of the engine at the operating point of the engine at the normal operation time. The operating point of the engine may be controlled with the operating point at which the load on the engine is large as the target operating point. Thus, the heating performance can be maintained even when the vehicle is stopped.

  According to the control device for a vehicle according to the present invention, during the heating operation, the operating point of the engine is controlled in accordance with the required value of the engine output, and the battery is configured to start the engine more than the normal operation when the heating operation is not performed. Set the charge amount threshold high. As a result, the engine can be easily started during the heating operation, and the heating operation can be performed early by using exhaust heat of the engine, so that the deterioration of the electricity cost can be suppressed during the heating operation.

FIG. 1 is a block diagram showing the configuration of a vehicle to which a control device for a vehicle according to an embodiment of the present invention is applied. FIG. 2 is a block diagram showing a configuration of a heating device mounted on the vehicle shown in FIG. FIG. 3 is a timing chart for explaining the operation of the heating device shown in FIG. FIG. 4 is a block diagram showing a configuration of a control device of a vehicle according to an embodiment of the present invention. FIG. 5 is a flowchart showing the flow of the heating control process according to the first embodiment of the present invention. FIG. 6 is a flowchart showing the flow of the heating control process according to the second embodiment of the present invention. FIG. 7 is a view for explaining the heating control process according to the second embodiment of the present invention, and FIG. 7 (a) is a driver request drive corresponding to the operating point of the engine shown in FIG. 7 (b). It is a figure which shows an example of a power, an engine speed difference, and an engine load difference, and FIG.7 (b) is a figure which shows an example of the operating point of the engine at the time of normal operation and heating operation.

  Hereinafter, with reference to the drawings, a configuration of a control device of a vehicle according to an embodiment of the present invention will be described.

[Configuration of vehicle]
First, the configuration of a vehicle to which a control device for a vehicle according to an embodiment of the present invention is applied will be described with reference to FIG.

  FIG. 1 is a block diagram showing the configuration of a vehicle to which a control device for a vehicle according to an embodiment of the present invention is applied. As shown in FIG. 1, a vehicle 1 to which a control device for a vehicle according to an embodiment of the present invention is applied only power of a battery such as a plug-in hybrid vehicle (PHV) or a range extended electric vehicle (REEV). The vehicle is configured of a vehicle capable of traveling (EV traveling) used and traveling (HV traveling) using engine power and battery power.

  The vehicle 1 includes an engine 2, a power split mechanism 3, a clutch 4, a motor 5, a clutch 6, a differential gear 7, a drive wheel 8, a generator 9, a battery 10, and a PCU (Power Control Unit) 11 as main components. Have.

  The engine 2 is configured by an internal combustion engine such as a gasoline engine or a diesel engine. The engine 2 outputs a driving torque for the vehicle 1 to travel.

  The power split mechanism 3 is configured by, for example, a planetary gear mechanism. The power split mechanism 3 is configured to be able to split the power transmission path between the power transmission path for transmitting the engine output to the drive wheel 8 side via the clutch 4 and the power transmission path for transmitting the engine output to the generator 9 side. It is done.

  The motor 5 is configured of, for example, a three-phase alternating current motor. The motor 5 has a function of transmitting a driving force to the drive wheel 8 through the clutch 6 and the differential gear 7 using the power of the battery 10. Further, the motor 5 also has a function as a generator (power generation device) which is driven to generate electric power during traveling using engine output or braking of the vehicle 1. The power generated by the motor 5 is supplied to the battery 10 via the PCU 11.

  The generator 9 has a function as a generator that generates electric power using the engine output split by the power split mechanism 3. The power generated by the generator 9 is supplied to the battery 10 via the PCU 11.

  The battery 10 is configured by a secondary battery such as a nickel hydrogen battery or a lithium ion battery. The battery 10 may be charged using power generated by the motor 5 and / or the generator 9 as well as power supplied from an external power supply. The battery 10 is not limited to the secondary battery, and may be a storage device capable of generating a direct current voltage and capable of charging, for example, a capacitor or the like.

  The PCU 11 has a function of converting DC power supplied from the battery 10 into AC power to drive the motor 5. The PCU 11 also has a function of converting AC power generated by the motor 5 and the generator 9 into DC power to charge the battery 10.

[Configuration of heating system]
Next, with reference to FIG. 2, FIG. 3, the structure of the heating apparatus mounted in the said vehicle 1 is demonstrated. FIG. 2 is a block diagram showing the configuration of a heating device 20 mounted on the vehicle 1 shown in FIG. FIG. 3 is a timing chart for explaining the operation of heating apparatus 20 shown in FIG.

  As shown in FIG. 2, the heating device 20 mounted on the vehicle 1 is a device for heating the vehicle interior using at least one of the exhaust heat of the engine 2 and the power of the battery 10, and is a heat pump (H / P 21) A heater 22, a water pump (W / P) 23, and a W / P 24 are provided as main components.

  The H / P 21 uses the power of the battery 10 to pressurize, compress, adiabatically expand the refrigerant, and exchange heat between the refrigerant and the engine cooling water, so that the engines supplied from the engine 2 and the W / P 23 Heat the cooling water.

  The heater 22 has a heater core that exchanges heat between the air in the vehicle compartment and the engine coolant discharged from the H / P 21. The heater 22 sends the air in the passenger compartment to the heater core, and heats the passenger compartment by exchanging heat between the air in the passenger compartment and the engine cooling water discharged from the H / P 21 in the heater core.

  The W / P 23 pumps the engine cooling water discharged from the heater 22 to the H / P 21. The W / P 24 pressure-feeds the engine cooling water discharged from the heater 22 in the order of the engine 2 and the H / P 21.

  In the heating device 20 having such a configuration, as shown in FIGS. 3 (a) and 3 (b), when the temperature of the engine cooling water is less than a first threshold (for example, 40.degree. C.) Because it is difficult to heat the engine, the engine coolant water channel R2 that circulates between the H / P 21, the heater 22, and the W / P 23 in the coolant water channel R1 that circulates between the engine 2 and the W / P 24 Circulate engine cooling water inside and out. And H / P independent operation which heats a vehicle interior using only H / P21 by driving H / P21 is performed.

  On the other hand, as shown in FIGS. 3A and 3C, when the temperature of the engine cooling water is equal to or more than the first threshold and less than the second threshold (for example, 60 ° C.), the temperature of the engine cooling water rises. Since it becomes possible to heat using engine cooling water, engine cooling water is circulated in engine cooling water flow path R3 which circulates between engine 2, H / P 21, heater 22, and W / P 24. Let And H / P & engine cooling water coordinated operation which heats a vehicle interior using both engine cooling water and H / P 21 by driving H / P 21 is performed. Note that, while the H / P independent operation and the H / P & engine cooling water coordinated operation are being performed, the intermittent operation in which the engine 2 is appropriately repeated to operate and stop is prohibited.

  Further, as shown in FIGS. 3A and 3C, when the temperature of the engine cooling water is equal to or higher than the second threshold, it is possible to heat the vehicle interior using only the engine cooling water. Thus, engine cooling water is circulated in the engine cooling water passage R3 circulating between the engine 2, the H / P 21, the heater 22, and the W / P 24. And driving of H / P21 is stopped and engine cooling water heating operation which heats a vehicle interior using only engine cooling water is performed. In addition, when the temperature of engine cooling water becomes less than a 2nd threshold value, while performing engine cooling water heating operation, H / P & engine cooling water cooperation driving is performed. In addition, while the engine cooling water heating operation is being performed, the intermittent operation in which the engine 2 appropriately repeats the operation and the stop is permitted.

[Configuration of Control Device of Vehicle]
Next, with reference to FIG. 4, a configuration of a control device of a vehicle according to an embodiment of the present invention will be described.

  FIG. 4 is a block diagram showing a configuration of a control device of a vehicle according to an embodiment of the present invention. As shown in FIG. 4, the control device 30 of a vehicle according to an embodiment of the present invention includes a heating switch 31, a heating setting unit 32, a vehicle speed sensor 33, an inclination sensor 34, a vehicle interior temperature sensor 35, and an engine coolant temperature sensor 36 and an ECU (Electronic Control Unit) 38 are provided as main components.

  The heating switch 31 is configured by an operating element for turning on / off the heating device 20. The heating switch 31 outputs, to the ECU 38, an electrical signal indicating whether the heating device 20 is on / off (presence or absence of a heating request) in response to the operation of the operation element.

  The heating setting unit 32 is configured by an operation element for setting the temperature of the vehicle interior. The heating setting unit 32 outputs, to the ECU 38, an electric signal indicating the temperature of the vehicle interior set according to the operation of the operation element.

  The vehicle speed sensor 33 detects the speed (vehicle speed) of the vehicle 1 and outputs an electrical signal indicating the detected vehicle speed to the ECU 38.

  The inclination sensor 34 detects an inclination angle in the front-rear direction of the vehicle 1 at a position where the vehicle 1 is located, and outputs an electric signal indicating the detected inclination angle to the ECU 38.

  The vehicle interior temperature sensor 35 detects the temperature in the vehicle interior and outputs an electrical signal indicating the detected temperature in the vehicle interior to the ECU 38.

  The engine coolant temperature sensor 36 detects the temperature of the engine coolant, and outputs an electrical signal indicating the detected temperature of the engine coolant to the ECU 38.

  The ECU 38 is mainly configured of a microcomputer including a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM) and the like, and executes various control programs stored in the ROM. Are executed to execute various control processes including a heating control process described later.

[Heating control process]
In the control device 30 of the vehicle having such a configuration, the ECU 38 executes the heating control process described below to suppress the deterioration of the electricity cost of the vehicle 1 during the heating operation. The operation of the ECU 38 at the time of executing the heating control process according to the first and second embodiments of the present invention will be described below with reference to FIGS.

First Embodiment
First, with reference to FIG. 5, an operation of the ECU 38 at the time of executing the heating control process according to the first embodiment of the present invention will be described. FIG. 5 is a flowchart showing the flow of the heating control process according to the first embodiment of the present invention. The flowchart shown in FIG. 5 starts at the timing when the occupant of the vehicle 1 operates the heating switch 31 to turn on the heating device 20, and the heating control process proceeds to step S1. The heating control process is repeatedly performed while the heating device 20 is turned on.

  In the process of step S1, the ECU 38 determines whether the traveling mode of the vehicle 1 is the EV traveling mode (CD mode). As a result of the determination, when the traveling mode of the vehicle 1 is the EV traveling mode (step S1: Yes), the ECU 38 advances the heating control process to the process of step S2. On the other hand, when the traveling mode of the vehicle 1 is not the EV traveling mode but the HV traveling mode (CS mode) (step S1: No), the ECU 38 advances the heating control process to the process of step S5.

  In the process of step S2, the ECU 38 detects the charge amount (SOC) of the battery 10 via the PCU 11, and determines whether the detected SOC is less than a predetermined value α (for example, 50%). As a result of the determination, if the SOC is less than the predetermined value α (step S2: Yes), the ECU 38 advances the heating control process to the process of step S4. On the other hand, when SOC is more than predetermined value alpha (Step S2: No), ECU38 advances heating control processing to processing of Step S3.

  In the process of step S3, the ECU 38 detects the temperature (requested heating level) of the vehicle interior requested using the electrical signal output from the heating setting unit 32, and the electricity output from the vehicle interior temperature sensor 35 The signal is used to detect the temperature in the passenger compartment (air conditioning level in the passenger compartment). Then, the ECU 38 executes the H / P independent operation so that the in-room air conditioning level becomes the required heating level. That is, the ECU 38 heats the vehicle interior using only the H / P 21. Thus, the process of step S3 is completed, and the heating control process returns to the process of step S1.

  In the process of step S4, the ECU 38 sets the SOC threshold value of the battery 10 for starting the engine 2 higher than that in the normal operation in which the heating operation is not performed (engine exhaust heat energy early use mode). Thus, the process of step S4 is completed, and the heating control process proceeds to the process of step S5.

  In the process of step S5, the required heating level is detected using the electrical signal output from the heating setting unit 32. Thus, the process of step S5 is completed, and the heating control process proceeds to the process of step S6.

  In the process of step S6, the ECU 38 detects the in-room air conditioning level using the electrical signal output from the in-room temperature sensor 35. Thus, the process of step S6 is completed, and the heating control process proceeds to the process of step S7.

  In the process of step S7, the ECU 38 detects the temperature thw of the engine cooling water using the electrical signal output from the engine cooling water temperature sensor 36, and the detected temperature thw of the engine cooling water is a predetermined temperature (for example, 60 ° C. It is determined whether or not it is less than. As a result of the determination, if the temperature thw of the engine cooling water is less than the predetermined temperature (step S7: Yes), the ECU 38 advances the heating control process to the process of step S9. On the other hand, when the temperature thw of the engine cooling water is equal to or higher than the predetermined temperature (step S7: No), the ECU 38 advances the heating control process to the process of step S8.

  In the process of step S8, the ECU 38 executes the engine cooling water (hot water) heating operation such that the air conditioning level in the passenger compartment detected in the process of step S6 becomes the required heating level detected in the process of step S5. That is, the ECU 38 stops the operation of the H / P 21 and heats the vehicle interior using only the engine cooling water. Thus, the process of step S8 is completed, and the heating control process returns to the process of step S1.

  In the process of step S9, first, the ECU 38 detects the vehicle speed based on the electric signal output from the vehicle speed sensor 33, and detects the inclination angle in the front-rear direction of the vehicle 1 based on the electric signal output from the inclination sensor 34. Next, the ECU 38 reads out the required value of the engine output corresponding to the detected vehicle speed and inclination angle as the driver's requested driving force from the map showing the relationship between the vehicle speed and inclination angle and the required value of the engine output. Then, the ECU 38 determines whether the driver request driving force is less than the predetermined value A. Here, the predetermined value A is a required value of the engine output (for example, 25 [kW]) that does not prevent the temperature rise of the engine cooling water even if the heating operation is performed using the engine cooling water warmed by the exhaust heat of the engine 2 Or more), in other words, corresponds to the required value of the engine output when the engine 2 is operating in a high load state. As a result of the determination, if the driver request driving force is less than the predetermined value A (step S9: Yes), the ECU 38 advances the heating control process to the process of step S10. On the other hand, when the driver request driving force is equal to or more than the predetermined value A (step S9: No), the ECU 38 advances the heating control process to the process of step S11.

  In the process of step S10, the ECU 38 determines that the engine 2 is not operating in a high load state, and the engine load and rotation speed at the operating point of the engine 2 at the normal operation time when the heating operation is not performed The operating point of the engine 2 is controlled with an operating point having a load of 2 and a large rotational speed as a target operating point. In the present embodiment, “the operating point of the engine 2” refers to the engine in a two-dimensional coordinate system with the state quantity indicating the operating state of the engine 2 exemplified by the engine speed and the engine output torque (load) It means the thing of the operating point which shows the operating state of 2 (refer FIG.7 (b)). As a result, the engine power can be increased and more heat energy can be generated compared to the normal operation when the heating operation is not performed. Thus, the process of step S10 is completed, and the heating control process proceeds to the process of step S12.

  In the process of step S11, the ECU 38 determines that the engine 2 is operating in a high load state, and the engine 2 uses the same operating point as the operating point of the engine 2 at the time of normal operation without heating operation. Control the operating point of Thus, the process of step S11 is completed, and the heating control process proceeds to the process of step S12.

  In the process of step S12, the ECU 38 executes the H / P & engine cooling water cooperative operation such that the air conditioning level in the passenger compartment detected in the process of step S6 becomes the required heating level detected in the process of step S5. That is, the ECU 38 heats the vehicle interior using both the H / P 21 and the engine cooling water. Thus, the process of step S12 is completed, and the heating control process returns to the process of step S1.

  As is apparent from the above description, in the heating control process according to the first embodiment of the present invention, the ECU 38 controls the operating point of the engine 2 in accordance with the driver request driving force during heating operation, and also performs heating The threshold value of the SOC of the battery 10 for starting the engine 2 is set to be higher than that in the normal operation where the operation is not performed. According to such a configuration, the engine 2 can be easily started during the heating operation, and the heating operation can be performed early using the exhaust heat of the engine 2, so the electricity cost of the vehicle 1 is deteriorated during the heating operation. Can be suppressed.

Second Embodiment
Next, with reference to FIGS. 6 and 7, the operation of the ECU 38 when executing the heating control process according to the second embodiment of the present invention will be described. FIG. 6 is a flowchart showing the flow of the heating control process according to the second embodiment of the present invention. FIG. 7 is a view for explaining the heating control process according to the second embodiment of the present invention, and FIG. 7 (a) shows the operation corresponding to the operating points P1 to P4 of the engine shown in FIG. 7 (b). FIG. 7B is a view showing an example of an operating point of the engine 2 in a normal operation and a heating operation.

  The flowchart shown in FIG. 6 starts at the timing when the occupant of the vehicle 1 operates the heating switch 31 to turn on the heating device 20, and the heating control process proceeds to step S21. The heating control process is repeatedly performed while the heating device 20 is turned on. Moreover, since the contents of the processing of steps S21 to S26 shown in FIG. 6 are the same as the contents of the processing of steps S1 to S6 shown in FIG. 5, the description thereof is omitted below and the description starts from the processing of step S27. .

  In the process of step S27, the ECU 38 detects the temperature thw of the engine cooling water using the electrical signal output from the engine cooling water temperature sensor 36, and the detected temperature thw of the engine cooling water is a predetermined temperature (for example, 60 ° C. It is determined whether or not it is less than. As a result of the determination, when the temperature thw of the engine cooling water is less than the predetermined temperature (step S27: Yes), the ECU 38 advances the heating control process to the process of step S29. On the other hand, when the temperature thw of the engine cooling water is equal to or higher than the predetermined temperature (step S27: No), the ECU 38 advances the heating control process to the process of step S28.

  In the process of step S28, the ECU 38 executes the engine coolant heating operation so that the air conditioning level in the passenger compartment detected in the process of step S26 becomes the required heating level detected in the process of step S25. That is, the ECU 38 heats the vehicle interior using only the engine coolant. Thus, the process of step S28 is completed, and the heating control process returns to the process of step S1.

  In the process of step S29, the ECU 38 prohibits the intermittent operation of the engine 2. Thus, the process of step S29 is completed, and the heating control process proceeds to the process of step S30.

  In the process of step S30, the ECU 38 detects the vehicle speed based on the electric signal output from the vehicle speed sensor 33, and determines whether the vehicle 1 is stopped based on the detected vehicle speed. As a result of the determination, when the vehicle 1 is stopped (step S30: Yes), the ECU 38 advances the heating control process to the process of step S31. On the other hand, when the vehicle 1 is traveling (step S30: No), the ECU 38 advances the heating control process to the process of step S32.

  In the process of step S31, the ECU 38 charges the battery 10 by driving the generator 9 with the engine output and charges the load of the engine 2 more than the load at the operating point of the engine 2 during normal operation which is not heating operation. Control the operating point of the engine 2 so that Specifically, as shown in FIGS. 7A and 7B, the ECU 38 controls the rotation of the engine 2 by controlling the operation point of the engine 2 from the operation point P1 ′ at the normal operation time to the operation point P1. The load of the engine 2 is increased by about 20 [Nm] while maintaining the number. In FIG. 7B, L1 indicates the operation line of the engine 2 at the time of heating control execution (heating on), L1 ′ indicates the operation line of the engine 2 at normal operation (heating off), and La indicates An equal load curve (proportional to the vehicle speed) of the engine 2 is shown, and Lb is an equal efficiency curve of the engine 2. Thus, the process of step S31 is completed, and the heating control process proceeds to the process of step S37.

  In the process of step S32, first, the ECU 38 detects the vehicle speed based on the electric signal output from the vehicle speed sensor 33, and detects the inclination angle in the front-rear direction of the vehicle 1 based on the electric signal output from the inclination sensor 34. Next, the ECU 38 reads out the required value of the engine output corresponding to the detected vehicle speed and inclination angle as the driver's requested driving force from the map showing the relationship between the vehicle speed and inclination angle and the required value of the engine output. Then, the ECU 38 determines whether the driver request driving force is less than the predetermined value A. As a result of the determination, when the driver request driving force is less than the predetermined value A (step S32: Yes), the ECU 38 advances the heating control process to the process of step S34. On the other hand, when the driver request driving force is equal to or more than the predetermined value A (step S32: No), the ECU 38 advances the heating control process to the process of step S33.

  In the process of step S33, the ECU 38 determines that the engine 2 is operating in a high load state, and the engine 2 uses the same operating point as the operating point of the engine 2 at the time of normal operation without heating operation. Control the operating point of Specifically, as shown in FIG. 7B, the ECU 38 controls the operating point of the engine 2 to the operating point P4 in the normal operation. Thus, the process of step S33 is completed, and the heating control process proceeds to the process of step S37.

  In the process of step S34, the ECU 38 determines whether the driver request driving force read in the process of step S32 is less than a predetermined value B. Here, the predetermined value B indicates that the temperature of the engine cooling water does not rise or falls (for example, heat radiation of less than 1 [kW]) when the heating operation is performed using the engine cooling water warmed by the exhaust heat of the engine 2 This value corresponds to the required value of the engine output (for example, in the range of 10 to 25 [kW]), in other words, the required value of the engine output when the engine 2 is operating in the middle load range. As a result of the determination, when the driver request driving force is less than the predetermined value B (step S34: Yes), the ECU 38 advances the heating control process to the process of step S35. On the other hand, when the driver request driving force is equal to or more than the predetermined value B (step S34: No), the ECU 38 advances the heating control process to the process of step S36.

  In the process of step S35, the ECU 38 determines that the engine 2 is operating in a low load state, and maintains the number of rotations of the engine 2 at the operating point of the engine 2 at the time of normal operation not performing heating operation. The operating point of the engine 2 is controlled so that the load of 2 is increased. Specifically, as shown in FIGS. 7 (a) and 7 (b), the ECU 38 maintains the engine speed at the engine speed NA, and operates the operating point of the engine 2 from the operating point P2 'at the time of normal operation. The load on the engine 2 is increased to less than 30 [Nm] by controlling to the operating point P2. As a result, while suppressing the generation of noise and vibration caused by the engine due to the increase in the number of revolutions of the engine 2, the engine power is increased more than when the heating device 20 is not turned on, and more heat energy is generated. It can be done. In the low load state, when the heating operation is performed using the engine cooling water warmed by the exhaust heat of the engine 2, the temperature of the engine cooling water is significantly reduced (for example, heat dissipation of 1 [kW] or more) It means the load state of the engine 2. Thus, the process of step S35 is completed, and the heating control process proceeds to the process of step S37.

  In the process of step S36, the ECU 38 determines that the engine 2 is operating in the medium load state, and the engine load and rotational speed at the operating point of the engine 2 at the normal operation time when the heating operation is not performed The operating point of the engine 2 is controlled with an operating point having a load of 2 and a large rotational speed as a target operating point. Specifically, as shown in FIGS. 7A and 7B, the ECU 38 controls the rotation of the engine 2 by controlling the operation point of the engine 2 from the operation point P3 'to the operation point P3 during normal operation. Increase the number less than 400 [rpm] and increase the load of engine 2 less than 40 [Nm]. As a result, the engine power can be increased and more heat energy can be generated than when the heating device 20 is not turned on. The ECU 38 may change the number of revolutions of the engine 2 in accordance with the magnitude of the driver request driving force. Thus, the process of step S36 is completed, and the heating control process proceeds to the process of step S37.

  In the process of step S37, the ECU 38 executes the H / P & engine cooling water cooperative operation such that the air conditioning level in the passenger compartment detected in the process of step S26 becomes the required heating level detected in the process of step S25. That is, the ECU 38 heats the vehicle interior using both the H / P 21 and the engine cooling water. Thus, the process of step S37 is completed, and the heating control process returns to the process of step S21.

  As apparent from the above description, in the heating control process according to the second embodiment of the present invention, the ECU 38 keeps the rotational speed of the engine 2 constant when the driver request driving force is less than the predetermined value B. While increasing the load on the engine 2. According to such a configuration, in addition to the effect obtained by the heating control process which is the first embodiment of the present invention, generation of noise and vibration caused by the engine due to the increase of the number of rotations of the engine 2 The effect of being able to suppress can be produced.

  Further, in the heating control process according to the second embodiment of the present invention, the ECU 38 drives the engine 2 to heat the vehicle interior using exhaust heat of the engine 2 when the vehicle 1 is stopped. The operating point of the engine 2 is controlled with the operating point at which the load of the engine 2 is larger than that of the load of the engine 2 at the operating point of the engine 2 in the normal operation as a target operating point. According to such a configuration, in addition to the effect obtained by the heating control process according to the first embodiment of the present invention, the effect that heating performance can be maintained even when the vehicle 1 is stopping Can play.

  The embodiment to which the invention made by the present inventors has been applied has been described above, but the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operation techniques and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

1 vehicle 2 engine 3 power split mechanism 4, 6 clutch 5 motor 7 differential gear 8 drive wheel 9 generator 10 battery 11 PCU (Power Control Unit)
20 heating system 21 heat pump (H / P)
22 heater 23, 24 water pump (W / P)
Reference Signs List 30 vehicle control device 31 heating switch 32 heating setting unit 33 vehicle speed sensor 34 inclination sensor 35 vehicle interior temperature sensor 36 engine coolant temperature sensor 38 ECU (Electronic Control Unit)

Claims (3)

It has a heating device that heats the passenger compartment using at least one of engine exhaust heat and battery power, and can perform traveling using only battery power and traveling using engine power and battery power A control device for a vehicle,
Control means for controlling the operating point of the engine according to the required value of the engine output during heating operation and setting the threshold of the charge amount of the battery for starting the engine higher than during normal operation when heating operation is not performed A control device of a vehicle characterized by   The control device for a vehicle according to claim 1, wherein, when the required value of the engine output is less than a predetermined value, the control means increases the load of the engine while keeping the number of revolutions of the engine constant.   The control means drives the engine to heat the vehicle interior using exhaust heat of the engine when the vehicle is at a stop, and compares the engine load at the operating point of the engine at the normal operation time. 3. The control system for a vehicle according to claim 1, wherein the operating point of the engine is controlled with the operating point at which the load on the engine is large as the target operating point.

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