JP2010095017A - Hybrid vehicle and control method of the same - Google Patents

Abstract

To warm up an internal combustion engine.
The engine lubrication system includes an engine lubrication system and a motor lubrication system, and further includes an engine oil pump that can supply lubricating oil from the motor lubrication system to the engine. Therefore, the engine lubrication reflects the temperature of the engine. When the lubricating oil temperature of the motor lubricating system 120 is higher than the lubricating oil temperature of the system 110, the lubricating liquid of the motor lubricating system 120 can be supplied to the engine 22, and warming up of the engine 22 can be promoted. Further, while the operation of the engine 22 is stopped and the motor is running, the lubricating oil temperature of the engine lubricating system 110 is lower than the first temperature, and the lubricating oil temperature of the motor lubricating system 120 is equal to or higher than the second temperature higher than the first temperature. At this time, the engine oil pump 126 is controlled to be driven, so that warm-up of the engine 22 can be more reliably promoted.
[Selection] Figure 3

Description

  The present invention relates to a hybrid vehicle and a control method thereof, and more particularly, to a hybrid vehicle including an internal combustion engine, an electric motor capable of outputting driving power, and an electric storage means capable of exchanging electric power with the electric motor, and a control method thereof. .

Conventionally, a hybrid vehicle of this type has been proposed that includes an internal combustion engine, an electric motor, and an oil pump that supplies lubricating oil from an oil pan to the internal combustion engine (see, for example, Patent Document 1). In this vehicle, the stator of the electric motor is coupled to the main body of the internal combustion engine, and an oil discharge passage from the cylinder head of the internal combustion engine is opened toward the stator of the electric motor, so that the oil lubricated for the valve mechanism of the internal combustion engine is By adopting a structure that can be supplied to the stator, the stator of the electric motor is cooled by the lubricating oil of the internal combustion engine.
JP 2005-180261 A

  In the hybrid vehicle described above, so-called motor travel is performed in which the operation of the internal combustion engine is stopped and the vehicle is driven by the power from the electric motor. Lubricating oil is not warmed and its viscosity is high, resulting in poor fuel economy and fuel consumption worsening due to fuel injection amount increase correction. It is desirable. Further, since the emission is likely to deteriorate when the internal combustion engine is started at a low temperature, it is desirable to warm up the engine to some extent before starting the internal combustion engine.

  The main object of the hybrid vehicle and the control method thereof of the present invention is to promote warm-up of the internal combustion engine.

  The hybrid vehicle and the control method thereof according to the present invention employ the following means in order to achieve at least the above-described main object.

The hybrid vehicle of the present invention
A hybrid vehicle comprising an internal combustion engine, an electric motor capable of outputting driving power, and an electric storage means capable of exchanging electric power with the electric motor,
Engine storage means for storing a lubricating liquid for lubricating the internal combustion engine, and engine supply means capable of supplying the lubricating liquid stored in the engine storage means to the internal combustion engine as the internal combustion engine rotates. An engine lubrication system having
Motor storage means connected to the engine storage means for storing lubricating liquid for lubricating the motor; and motor supply means capable of supplying the motor with the lubricating liquid stored in the motor storage means. Having an electric motor lubrication system;
Lubricating liquid supply means capable of supplying a lubricating liquid of the motor lubricating system to the internal combustion engine;
It is a summary to provide.

  In the hybrid vehicle of the present invention, an engine storage means for storing a lubricating liquid for lubricating the internal combustion engine, and an engine capable of supplying the lubricating liquid stored in the engine storage means to the internal combustion engine as the internal combustion engine rotates. An engine lubrication system having an engine supply means, a motor storage means connected to the engine storage means for storing a lubricating liquid for lubricating the motor, and a lubricant stored in the motor storage means can be supplied to the motor An electric motor lubrication system having an electric motor supply means; and a lubricating liquid supply means capable of supplying the lubricating liquid of the electric motor lubrication system to the internal combustion engine. Thus, when the temperature of the lubricating fluid in the motor lubrication system is higher than the temperature of the internal combustion engine, the lubricating fluid in the motor lubrication system can be supplied to the internal combustion engine, so that warming up of the internal combustion engine can be promoted. Here, the “engine supply means” includes a mechanical pump that is driven by rotation of the output shaft of the internal combustion engine and can pump the lubricating liquid. The “motor supply means” includes an electric pump that can be driven using electric power from the power storage means to pump the lubricating liquid, and a mechanical pump that can be driven by the rotation of the axle to pump the lubricating liquid. included.

  In such a hybrid vehicle of the present invention, the lubricating liquid supply means is configured by a pressure feeding device or a valve that can be opened / closed to pump the lubricating fluid of the motor lubrication system to the internal combustion engine, and the driving of the pressure feeding device or the valve It may be a means for supplying the internal combustion engine with the lubricating fluid of the electric motor lubrication system by opening.

  Further, in the hybrid vehicle of the present invention, an engine reflected temperature detecting means for detecting an engine reflected temperature reflecting the temperature of the internal combustion engine, and a lubricating liquid for detecting a lubricating liquid temperature which is a lubricating liquid temperature of the motor lubricating system. The temperature of the lubricating fluid detected when the operation of the internal combustion engine is stopped and the detected engine reflected temperature is lower than a first temperature indicating a state where the internal combustion engine is not warmed up. Control means for executing warm-up control for controlling the lubricating liquid supply means so that the lubricating liquid of the motor lubricating system is supplied to the internal combustion engine when the temperature is equal to or higher than a second temperature higher than the first temperature; It can also be provided. In this way, warm-up of the internal combustion engine can be more reliably promoted.

  In the hybrid vehicle of the present invention in which the warm-up control is executed when the operation of the internal combustion engine is stopped, the control means detects the lubricant temperature detected after the start of the warm-up control. Is less than the third temperature, which is equal to or higher than the first temperature and lower than the second temperature, until the detected lubricating liquid temperature becomes equal to or higher than the second temperature. It may be a means for controlling the lubricating liquid supply means so that the supply of the lubricating liquid to the internal combustion engine is stopped. If it carries out like this, while being able to suppress execution and a stop of warm-up control switching frequently, it can suppress that the temperature of an electric motor falls excessively.

  In the hybrid vehicle of the present invention in which warm-up control is executed when the operation of the internal combustion engine is stopped, the control means reflects the detected engine after the start of the warm-up control. When the temperature becomes equal to or higher than the first temperature, the lubricating liquid supply means may be controlled to stop the supply of the lubricating liquid of the motor lubrication system to the internal combustion engine. In this way, it is possible to prevent the warm-up control from being continued in vain.

  Further, in the hybrid vehicle of the present invention in which the warm-up control is performed when the operation of the internal combustion engine is stopped, a second electric motor capable of motoring the internal combustion engine using electric power from the power storage means is provided. The control means may be means for controlling the second electric motor so that the internal combustion engine is motored when the warm-up control is executed. If it carries out like this, when performing warm-up control, an internal combustion engine can be lubricated more reliably and warm-up of an internal combustion engine can be accelerated | stimulated more reliably.

  Alternatively, in the hybrid vehicle of the present invention in which the warm-up control is executed when the operation of the internal combustion engine is stopped, the control means is configured to perform the operation according to an accelerator operation in a state where the operation of the internal combustion engine is stopped. The warm-up control may be performed while the internal combustion engine and the electric motor are being controlled so as to travel by power from the electric motor. In this case, the control means may be means for controlling the electric motor supply means so that the lubricating liquid from the electric motor storage means is supplied to the electric motor. If it carries out like this, the lubricating oil of an electric motor lubrication system can be made easy to warm, and warming up of an internal combustion engine can be accelerated | stimulated more reliably.

  Further, in the hybrid vehicle of the present invention in which the warm-up control is executed when the operation of the internal combustion engine is stopped, the connection that can be opened and closed in the flow path that connects the engine storage unit and the motor storage unit The control means may be a means for controlling the connection valve so that the connection valve is opened when the warm-up control is executed. If it carries out like this, when performing warming-up control, it can suppress that the lubricating fluid stored in the storage means for electric motors reduces.

The hybrid vehicle control method of the present invention includes:
An internal combustion engine, an electric motor capable of outputting driving power, an electric storage means capable of exchanging electric power with the electric motor, an engine storage means for storing a lubricating liquid for lubricating the internal combustion engine, and the storage for the engine An engine lubrication system having an engine supply means capable of supplying the lubricating liquid stored in the means to the internal combustion engine as the internal combustion engine rotates, and for lubricating the electric motor connected to the engine storage means An electric motor lubrication system having an electric motor storage means for storing the lubricating liquid and an electric motor supply means capable of supplying the electric motor with the lubricating liquid stored in the electric motor storage means; A control method for a hybrid vehicle comprising: a lubricant supply means that can be supplied to an engine,
When the operation of the internal combustion engine is stopped and the engine reflected temperature reflecting the temperature of the internal combustion engine is lower than a first temperature indicating a state where the internal combustion engine is not warmed up, the lubricating liquid of the motor lubrication system When the lubricating liquid temperature, which is a temperature, is equal to or higher than a second temperature higher than the first temperature, warm-up control is performed to control the lubricating liquid supply means so that the lubricating liquid of the motor lubricating system is supplied to the internal combustion engine. Execute,
It is characterized by that.

  In this hybrid vehicle control method of the present invention, when the operation of the internal combustion engine is stopped and the engine reflected temperature reflecting the temperature of the internal combustion engine is lower than the first temperature indicating that the internal combustion engine is not warmed up. When the lubricating liquid temperature, which is the temperature of the lubricating liquid in the motor lubricating system, is equal to or higher than the second temperature higher than the first temperature, the lubricating liquid supplying means is controlled to control the lubricating liquid supply means so that the lubricating liquid in the electric motor lubricating system is supplied to the internal combustion engine. Execute machine control. Thereby, warming-up of an internal combustion engine can be accelerated | stimulated. Here, the “engine supply means” includes a mechanical pump that is driven by rotation of the output shaft of the internal combustion engine and can pump the lubricating liquid. The “motor supply means” includes an electric pump that can be driven using electric power from the power storage means to pump the lubricating liquid, and a mechanical pump that can be driven by the rotation of the axle to pump the lubricating liquid. included.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 as an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22 as an internal combustion engine that outputs power using a hydrocarbon fuel such as gasoline or light oil, and a crankshaft 26 as an output shaft of the engine 22 via a damper. A planetary gear mechanism 30 to which the carrier is connected, a motor MG1 as a synchronous generator motor having a rotor connected to the sun gear of the planetary gear mechanism 30, and a differential gear 62 connected to the ring gear of the planetary gear mechanism 30. A motor MG2 as a synchronous generator motor having a rotor connected to a drive shaft 32 connected to drive wheels 63a and 63b via a gear mechanism, and a battery 50 connected to motors MG1 and MG2 via inverters 41 and 42. And an electronic control unit 70 for controlling the entire vehicle. Here, the battery 50 is configured as a secondary battery such as a nickel metal hydride battery or a lithium ion battery, and is a connector that can be coupled to a connector 55 of a charger 54 outside the vehicle connected to an external power source such as a household power source (AC100V). A charging circuit 52 to which 53 is attached is connected, and when the charging circuit 52 and a charger 54 outside the vehicle are connected, the charging circuit uses power from an external power source before starting the system of the vehicle, that is, before starting running. 52 can be charged. Thereby, the hybrid vehicle 20 can start traveling with the battery 50 fully charged. The hybrid vehicle 20 includes an auxiliary battery (not shown) that is supplied with electric power from the battery 50, a cooling system 90 that cools the engine 22 and the motors MG1 and MG2 as shown in FIG. 2, and an engine as shown in FIG. The engine lubrication system 110 that lubricates the motor 22 and the motor lubrication system 120 that lubricates the motors MG1 and MG2 are further provided.

  As shown in the figure, the cooling system 90 includes a cooling system that cools the engine 22 and a cooling system that cools the inverters 41 and 42 and the motors MG1 and MG2 independently of the cooling system. The cooling system of the engine 22 includes a radiator 92 that cools cooling water that has circulated through the engine 22 by running wind or a fan (not shown), and a thermostat 93 that shuts off the cooling water from the radiator 92 when the water temperature condition is not satisfied, Driven by electric power from an auxiliary battery (not shown) and sucks cooling water from a radiator 92 via a thermostat 93 or cooling water not circulated from a bypass passage (not shown) that circulates inside the engine 22. A cylinder block constituting the engine 22 by driving the water pump 94. The cylinder block comprises an electric water pump 94 that is pumped to the engine 22 and a heater 95 that warms cooling air of an air conditioner (not shown) by cooling water circulating through the engine 22. Cooling water to 24 and cylinder head 23 It is possible to cool the engine 22 by circulating braking manner. The cooling systems of inverters 41 and 42 and motors MG1 and MG2 are driven by radiator 96 that cools the cooling water circulating through motors MG1 and MG2 by running wind and a fan (not shown), and inverters 41 and 42 driven by an auxiliary battery (not shown). An electric water pump 98 that sucks the cooled cooling water and pumps it to the motors MG1, MG2 is provided, and the inverters 41, 42 and the motors MG1, MG2 can be cooled by driving the water pump 98. In the embodiment, the water temperature condition of the thermostat 93 is such that the cooling water temperature is equal to or higher than a predetermined temperature (for example, 75 ° C. or 80 ° C.) indicating a state where the engine 22 is warmed up. In the embodiment, the water pump 98 is driven such that the higher the cooling water temperature, the larger the discharge flow rate.

  As shown in the figure, the engine lubrication system 110 is attached to the lower part of the engine 22 to store the lubricating oil, and is driven by the rotation of the crankshaft 26 attached to the crankshaft 26 of the engine 22 and the oil pan. And a mechanical oil pump 114 that sucks the lubricating oil stored in 112 and pumps it to the upper part of the engine 22 such as the upper surface of the cylinder head 23. The lubricating oil supplied from the upper part of the engine 22 by driving the oil pump 114. Is able to lubricate sliding portions such as a camshaft, piston, crankshaft 26 (not shown) in the engine 22 by returning from the oil return hole (not shown) of the cylinder head 23 to the oil pan 112 through the cylinder block 24. It has become.

  As shown in the figure, the motor lubrication system 120 is driven by electric power from an oil pan 122 that is attached to the lower part of the motors MG1 and MG2 housed in a single case and stores lubricating oil, and an auxiliary battery (not shown). And an oil pump 124 that sucks the lubricating oil stored in the oil pan 122 and pumps it to the top of the inverters 41 and 42 housed in a single case. The oil pump 124 drives the top of the inverters 41 and 42. The lubricating oil supplied from the inverter 41 and 42 is returned to the oil pan 122 via the motors MG1 and MG2 disposed below the inverters 41 and 42, so that the inverters 41 and 42 and the motors MG1 and MG2 are prevented from overheating. The sliding parts such as the rotation shafts of MG1 and MG2 can be lubricated. Further, the motor lubrication system 120 is driven by electric power from an auxiliary battery (not shown), and an oil pump 126 that sucks lubricating oil stored in the oil pan 122 and pumps it to the upper portion of the engine 22; And an adjustment valve 128 provided in a flow path connecting the oil pan 122 and capable of adjusting the opening degree using electric power from an auxiliary battery (not shown), and driving the oil pump 126 that is normally stopped. By opening the adjustment valve 128 that is normally fully closed, the sliding portion of the engine 22 can be lubricated in the same manner as when the oil pump 114 of the engine lubrication system 110 is driven. Hereinafter, the oil pump 124 is also referred to as a motor oil pump 124, and the oil pump 126 is also referred to as an engine oil pump 126.

  The electronic control unit 70 is configured as a microprocessor having a CPU 72 as a center, and includes a ROM 74 that stores a processing program, a RAM 76 that temporarily stores data, and an input / output port (not shown) in addition to the CPU 72. The electronic control unit 70 includes an ignition signal from the ignition switch 80, a shift position SP from the shift position sensor 82 that detects the operation position of the shift lever 81, and an accelerator pedal position sensor 84 that detects the amount of depression of the accelerator pedal 83. In addition to the accelerator opening Acc, the brake pedal position BP from the brake pedal position sensor 86 for detecting the depression amount of the brake pedal 85, the vehicle speed V from the vehicle speed sensor 88, a crank position sensor (not shown) attached to the crankshaft 26, etc. Detected by signals from various sensors that detect the operating state of the engine 22, signals from a rotational position detection sensor (not shown) that detects the rotational position of the rotors of the motors MG1, MG2, and current sensors (not shown). Signals necessary for driving and controlling the motors MG1, MG2, such as phase currents applied to the motors MG1, MG2, charging / discharging currents from a current sensor (not shown) attached in the vicinity of the output terminal of the battery 50, and a charging circuit 52 Cooling from a water temperature sensor 25 that detects the temperature of the cooling water that is attached to the cylinder block 24 of the engine 22 and that is necessary for managing the battery 50 such as a signal from a voltage sensor and a current sensor (not shown) attached to the A signal necessary for controlling the cooling system 90 such as the cooling water temperature Twmg from the water temperature sensor 43 which is attached near the inlet of the cooling water to the inverters 41 and 42 and detects the temperature of the cooling water, the oil pan 112 The lubricating oil temperature Toeg and the oil from the oil temperature sensor 115 that is attached to the oil and detects the temperature of the lubricating oil Attached to down 122 such as a signal necessary for controlling the engine lubrication system 110 and motor lubrication system 120, such as a lubricating oil temperature Tomg from an oil temperature sensor 125 for detecting the temperature of lubricating oil is supplied. The electronic control unit 70 also controls the operation of the engine 22, a switching control signal to the inverters 41 and 42, a control signal to the charging circuit 52, and a driving signal to the water pumps 94 and 98 of the cooling system 90. , Driving signals to the oil pumps 124 and 126 of the motor lubrication system 120 are output. The electronic control unit 70 calculates the rotational speed of the crankshaft 26, that is, the rotational speed Ne of the engine 22 based on a signal from a crank position sensor (not shown), and outputs each rotor from a rotational position detection sensor (not shown). The rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 are calculated based on the rotational position, and the remaining capacity SOC of the battery 50 is calculated based on an integrated value of charge / discharge current from a current sensor (not shown).

  The hybrid vehicle 20 of the embodiment thus configured calculates the required torque to be output to the drive shaft 32 as the drive shaft based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver. The operation of the engine 22, the motor MG1, and the motor MG2 is controlled so that the required power corresponding to the required torque is output to the drive shaft 32. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is transmitted to the planetary gear mechanism 30. Torque conversion is performed by the motors MG1 and MG2 and output to the drive shaft 32. The torque conversion operation mode for driving and controlling the motors MG1 and MG2 and the required power and the power required for charging and discharging the battery 50 are met. Operation of the engine 22 is controlled so that power is output from the engine 22, and all or part of the power output from the engine 22 with charge / discharge of the battery 50 is transmitted to the planetary gear mechanism 30, the motor MG1, and the motor MG2. The required power is transferred to the drive shaft 32 with torque conversion by Charge / discharge operation mode in which the motor MG1 and the motor MG2 are driven and controlled so as to be powered, motor operation mode in which the operation of the engine 22 is stopped and the power corresponding to the required power from the motor MG2 is output to the drive shaft 32, etc. There is. In the hybrid vehicle 20, the target rotational speed and target torque of the engine 22 and the target torque of the motors MG1 and MG2 are set so that the required power corresponding to the required torque is output to the drive shaft 32 with such operation mode switching. Operation control such as fuel injection control, ignition control and intake air amount adjustment control is performed so that the engine 22 is operated at the target rotational speed and target torque, and the motors MG1 and MG2 limit the target torque as necessary. The drive control for switching the inverters 41 and 42 is performed so that the inverters 41 and 42 are driven.

  Next, when the engine 22 is lubricated while the operation of the hybrid vehicle 20 of the embodiment thus configured, in particular, the running in the motor operation mode started by the ignition on with the battery 50 fully charged is continued. Will be described. FIG. 4 is a flowchart showing an example of a lubrication control routine executed by the electronic control unit 70. This routine executes a drive control routine (not shown) for controlling the engine 22 and the motors MG1 and MG2 so as to run or stop according to the accelerator operation in the motor operation mode (hereinafter also simply referred to as “motor running”). In parallel with each other at a predetermined time (for example, every several milliseconds). Since the operation of the engine 22 is stopped, the oil pump 114 of the engine lubrication system 110 stops driving.

  When the lubrication control routine is executed, first, the CPU 72 of the electronic control unit 70 first determines the lubricant temperature Toeg from the oil temperature sensor 115 of the engine lubrication system 110 and the lubricant temperature Tomg from the oil temperature sensor 125 of the motor lubrication system 120. Data necessary for control is input (step S110), and a process of determining whether or not the input lubricating oil temperature Toeg is lower than the first temperature To1 is executed (step S110). The first temperature To1 is a temperature indicating a state in which the engine 22 is not warmed up. In the embodiment, the first temperature To1 is a value that is determined in advance as a temperature slightly higher than normal temperature (for example, 40 ° C. or 45 ° C.) and stored in the ROM 74. Was used.

  When the lubricating oil temperature Toeg of the engine lubricating system 110 is lower than the first temperature To1, it is determined whether or not the engine oil pump 126 of the motor lubricating system 120 is driven (step S120), and the engine oil pump 126 is driven. If not, it is determined whether or not the input lubricating oil temperature Tomg of the motor lubrication system 120 is equal to or higher than the second temperature To2 higher than the first temperature To1 (step S130). In the embodiment, the second temperature To2 uses a value that is determined in advance through experiments or the like and stored in the ROM 74 as a temperature (for example, 60 ° C. or 65 ° C.) that can sufficiently warm the engine 22 near normal temperature. It was.

  When the lubricating oil temperature Tomg of the motor lubrication system 120 is lower than the second temperature To2, the motor oil pump 124 of the motor lubrication system 120 is driven (step S210), and the lubrication control routine is terminated. In the embodiment, the motor oil pump 124 is driven so as to obtain a predetermined discharge pressure sufficient to supply lubricating oil to the upper portions of the inverters 41 and 42. At present, since the motor is running, the lubricating oil temperature Tomg of the motor lubrication system 120 gradually increases by driving the motor oil pump 124 and driving the motor MG2 that outputs driving power. It will be.

  When the lubricating oil temperature Tomg of the motor lubrication system 120 becomes equal to or higher than the second temperature To2 in step S130, the engine oil pump 126 of the motor lubrication system 120 starts to be driven (step S150), and the adjustment valve has been fully closed. In addition to opening 128 (full opening in the embodiment) (step S160), driving of the motor MG1 is started so that the engine 22 is motored (step S170), and driving of the motor oil pump 124 is continued (step S210). ) End the lubrication control routine. In the embodiment, the engine oil pump 126 is driven so as to obtain a discharge pressure sufficient to supply lubricating oil to the upper portion of the engine 22. The motor MG1 is driven by feedback control of the rotational speed Nm1 of the motor MG1 so that torque for rotating the engine 22 that stops fuel injection at a predetermined rotational speed (for example, 900 rpm or 1000 rpm) is output from the motor MG1. To do it. The reason why the motor 22 is motored by the motor MG <b> 1 is to make it easier for the lubricating oil to spread to each sliding portion of the engine 22. By such control, the lubricating oil that has reached the second temperature To2 or higher of the motor lubrication system 120 can be supplied to the engine 22, so that the engine 22 can be warmed while the motor is running.

  When the lubricating oil temperature Toeg of the engine lubricating system 110 is lower than the first temperature To1 in step S110 and the engine oil pump 126 of the motor lubricating system 120 is driven in step S120, the lubricating oil temperature Tomg of the motor lubricating system 120 is driven. Is less than the third temperature To3 which is higher than the first temperature To1 and lower than the second temperature To2 (step S140). When the lubricating oil temperature Tomg is equal to or higher than the third temperature To3, the motor pump 124 is driven. (Step S210), and the lubrication control routine is terminated. In the embodiment, the third temperature To3 is determined in advance by experiments or the like as a lower limit value (for example, 50 ° C. or 55 ° C.) of a predetermined appropriate temperature range for driving the inverters 41 and 42 and the motors MG1 and MG2, and the ROM 74 The value stored in is used. Therefore, by continuing to drive the engine pump 126 and continuously supplying the lubricating oil of the motor lubrication system 120 to the engine 22, the engine 22 can be further warmed while the motor is running.

  When the lubricating oil temperature Tomg of the motor lubrication system 120 becomes lower than the third temperature To3, the drive of the engine oil pump 126 is stopped (step S180), the adjustment valve 128 is fully closed (step S190), and the engine 22 is driven. The motor MG1 is stopped to stop the motoring (step S200), the motor pump 124 is continuously driven (step S210), and the lubrication control routine is terminated. Depending on the motor running state, the lubricating oil temperature Tomg of the motor lubricating system 120 may be maintained at a temperature equal to or higher than the third temperature To3. However, when the lubricating oil temperature Tomg falls below the third temperature To3, the motor lubricating system 120 Since the supply of the lubricating oil to the engine 22 is stopped, it is possible to prevent the temperatures of the inverters 41 and 42 and the motors MG1 and MG2 from excessively decreasing. Thereafter, when the lubricating oil temperature Tomg becomes equal to or higher than the second temperature To2 in a state where the lubricating oil temperature Toeg is lower than the first temperature To1, the supply of the lubricating oil from the motor lubricating system 120 to the engine 22 is resumed ( Steps S100 to S130, S150 to S170, S210).

  When the lubricating oil temperature Toeg of the engine lubrication system 110 becomes equal to or higher than the predetermined temperature Tref in step S110, the drive of the engine oil pump 126 is stopped, the adjustment valve 128 is fully closed, and the drive of the motor MG1 is stopped. In this state, the drive of the motor oil pump 124 is continued (steps S180 to S210), and the lubrication control routine is terminated. Thus, when the engine 22 is warmed up until the lubricating oil temperature Toeg becomes equal to or higher than the first temperature To1, the supply of the lubricating oil of the motor lubricating system 120 to the engine 22 is stopped. It is possible to suppress the wasteful supply.

  FIG. 5 shows the remaining capacity SOC, the lubricating oil temperature Toeg, and the lubricating oil temperature of the battery 50 when the engine 22 is lubricated while the motor running started by the ignition on is continued with the battery 50 fully charged. An example of a time change with Tomg and the supply amount of the lubricating oil to the engine 22 is shown. Although the remaining capacity SOC of the battery 50 gradually decreases due to the motor running, the lubricating oil temperature Tomg becomes equal to or higher than the second temperature To2 when the engine 22 whose lubricating oil temperature Toeg is lower than the first temperature To1 is not warmed up. Supply of lubricating oil from the motor lubrication system 120 to the engine 22 is started (time t1). When the lubricating oil temperature Tomg becomes lower than the third temperature To3, the supply of this lubricating oil is stopped (time t2). The start-stop-start of oil supply is repeated (time t3-t4-t5), and the engine 22 is gradually warmed. Then, when the remaining capacity SOC of the battery 50 reaches less than the threshold value, the engine 22 is started to end the motor travel (time t6). Thus, the engine 22 can be warmed while the motor is running. As a result, the warm-up of the engine 22 accompanied by the operation of the engine 22 is completed at an early stage after the motor travel is completed, and the wasteful fuel consumption is suppressed by suppressing, for example, the friction loss of the sliding portion and the increase in the fuel injection amount. In addition, it is possible to suppress the deterioration of emission due to, for example, emission of nitrogen oxide (NOx) when the engine 22 is started. Further, in the hybrid vehicle 20 of the embodiment, when the lubricating oil temperature Tomg of the motor lubrication system 120 becomes higher than the second temperature To2, for example, the heat energy is released by cooling the inverters 41, 42 and the motors MG1, MG2 by the cooling system 90. In the hybrid vehicle 20 that can start running with the battery 50 fully charged, especially when the battery 50 is fully charged, the engine 22 is started from the ignition-on state when the remaining capacity SOC of the battery 50 falls below the threshold value. The amount of heat energy released tends to increase because the time until the motor 50 starts to run without fully charging the battery 50 is longer. On the other hand, in the hybrid vehicle 20 of the embodiment, the heat energy that can be released from the inverters 41 and 42 of the cooling system 90 and the cooling system of the motors MG1 and MG2 can be used to warm the engine 22. Energy efficiency can be improved. Since the cooling system of the engine 22 of the cooling system 90 includes the thermostat 93, the thermal energy of the engine 22 is not released from the cooling system of the engine 22 until the warm-up of the engine 22 is completed. Further, since the warm-up of the engine 22 can be completed early after the motor travel is completed, it is more reliable to heat the passenger compartment using the heater 95 of the cooling system 90 after the motor travel is completed, for example, in a cold district. It will be something that can be done.

  According to the hybrid vehicle 20 of the embodiment described above, the engine lubrication system 110 and the motor lubrication system 120 are provided, and further the engine oil pump 126 capable of supplying the lubricating oil of the motor lubrication system 120 to the engine 22 is provided. When the lubricating oil temperature Tomg of the motor lubricating system 120 is higher than the temperature of the lubricating oil temperature Toeg of the engine lubricating system 110 reflecting the temperature of the engine 22, the lubricating liquid of the motor lubricating system 120 can be supplied to the engine 22; Warming up of the engine 22 can be promoted. Further, in the motor operation mode in which the operation of the engine 22 is stopped, the lubricating oil temperature Toeg from the oil temperature sensor 115 is lower than the first temperature To1, and the lubricating oil temperature Tomg from the oil temperature sensor 126 is equal to or higher than the second temperature To2. Since the engine oil pump 126 is sometimes controlled to be driven, warm-up of the engine 22 can be more reliably promoted. Further, when the lubricating oil temperature Tomg becomes lower than the third temperature To3 while the engine oil pump 126 is being driven, the engine oil pump 126 is driven until the lubricating oil temperature Tomg becomes equal to or higher than the second temperature To2. Since the engine is stopped, it is possible to suppress frequent switching between driving and stopping of the engine oil pump 126, and to prevent the temperatures of the inverters 41 and 42 and the motors MG1 and MG2 from excessively decreasing. Can do. In addition, since the drive of the engine oil pump 126 is stopped when the engine 22 is warmed until the lubricating oil temperature Toeg becomes equal to or higher than the first temperature To1 after the drive of the engine oil pump 126 is started, the motor lubrication system is stopped. The 120 lubricating oil is not continuously supplied to the engine 22. Further, since the motor 22 is motored by the motor MG1 when the lubricating oil of the motor lubrication system 120 is supplied to the engine 22, the engine 22 can be more reliably lubricated and the warm-up of the engine 22 can be more reliably promoted. can do. Furthermore, since the lubricating oil of the motor lubricating system 120 is supplied to the engine 22 with the driving of the motor oil pump 124 while the motor is running, the lubricating oil of the motor lubricating system 120 can be easily warmed. The warm-up of the engine 22 can be more reliably promoted. In addition, when the lubricating oil of the motor lubrication system 120 is supplied to the engine 22, the adjustment valve 128 is opened to suppress the shortage of lubricating oil sucked by the engine oil pump 126. When not performed, the lubricating oil of the motor lubrication system 120 can be easily warmed by closing the adjustment valve 128.

  In the hybrid vehicle 20 of the embodiment, the third temperature To3 is higher than the first temperature To1, but the third temperature To3 may be the same temperature as the first temperature To1. In this way, warming up of the engine 22 can be further promoted.

  In the hybrid vehicle 20 of the embodiment, the engine oil pump 126 starts to be driven when the lubricating oil temperature Tomg is equal to or higher than the second temperature To2, and the engine oil pump is driven when the lubricating oil temperature Tomg becomes lower than the third temperature To3. The driving of the engine oil pump 126 is started or stopped depending on whether the lubricating oil temperature Tomg is equal to or higher than the second temperature To2 without using the third temperature To3. It may be a thing.

  In the hybrid vehicle 20 of the embodiment, the lubricating oil temperature Toeg from the oil temperature sensor 115 is used to reflect the temperature of the engine 22, but the cooling water temperature Tweg from the water temperature sensor 25 may be used.

  In the hybrid vehicle 20 of the embodiment, when the lubricating oil of the motor lubrication system 120 is supplied to the engine 22, the driving start and stop of the engine oil pump 126 and the driving start and stop of the motor MG 1 for motoring the engine 22 are performed. The motor MG1 starts to be driven at a predetermined timing after the engine oil pump 126 starts to be driven, and the engine MG1 is stopped at the same time as the engine oil pump 126 is stopped. The motor 22 may be motored.

  In the hybrid vehicle 20 of the embodiment, in the motor lubrication system 120, the engine oil pump 126 sucks the lubricant stored in the oil pan 122 and pumps it to the engine 22. Therefore, a flow path to the upper part of the engine 22 for supplying a part of the lubricating liquid from the motor oil pump 124 to the engine 22 is provided and disposed in this flow path. A part of the lubricating liquid from the motor oil pump 124 may be sucked by the engine oil pump 126 and pumped to the engine 22.

  In the hybrid vehicle 20 of the embodiment, the motor lubrication system 120 includes the engine oil pump 126. However, instead of the oil pump 126, a valve that can be opened and closed may be included. In this case, a flow path for supplying a part of the lubricating liquid from the motor oil pump 124 to the engine 22 is provided, and a valve is disposed in the flow path to supply the lubricating oil of the motor lubrication system 120 to the engine 22. In this case, the valve oil and the adjustment valve 128 are opened, and the motor oil that provides a sufficient discharge pressure for supplying the lubricating oil stored in the oil pan 122 to the inverters 41 and 42, the motors MG1 and MG2, and the engine 22 is obtained. The pump 124 may be driven.

  In the hybrid vehicle 20 of the embodiment, the motor lubrication system 120 includes the electric motor oil pump 124, but instead of the electric oil pump 124, it is driven by the rotation of the axle to pump the lubricating oil. A mechanical oil pump may be provided, or a part of the gear of the gear mechanism that connects the drive wheels 63a and 63b and the drive shaft 32 or a part of the rotor of the motor MG2 may be the oil pan 122 or the oil pan 122. And a scraping mechanism for supplying the lubricating oil, which is immersed in the lubricating oil stored in a storage portion made up of a case or the like and scraped along with the rotation of the axle or the rotation of the motor MG2, to the upper portion of the engine 22. Also good. In these cases, the process of driving the motor pump 124 in step S210 in the lubrication control routine of FIG. 4 is not necessary.

  In the hybrid vehicle 20 of the embodiment, the adjustment valve 128 is fully opened when the lubricating oil of the motor lubrication system 120 is supplied to the engine 22, but the signal from a level sensor (not shown) attached to the oil pan 122 is used. Based on this, the opening degree of the adjustment valve 128 may be adjusted so that the oil amount of the oil pan 122 becomes equal to or greater than a predetermined amount sufficient for normal operation of the oil pumps 124 and 126.

  In the hybrid vehicle 20 of the embodiment, the adjustment valve 128 is provided in the flow path connecting the oil pan 112 and the oil pan 122. Instead of the adjustment valve 128, lubricating oil from the oil pan 122 to the oil pan 112 is provided. There may be provided a check valve for stopping the inflow of the oil and an orifice designed so that the oil amount of the oil pan 122 becomes a predetermined amount or more sufficient for normal operation of the oil pumps 124 and 126.

  In the hybrid vehicle 20 of the embodiment, the processing is described as continuing the motor running started by the ignition on, but the engine 22 is once started and the motor running during the intermittent operation is being performed. It may be applied to the process. In this case, the upper limit (for example, 60 ° C. or 65 ° C.) of the temperature indicating that the engine 22 is not warmed up is used as the first temperature To1, and the lubricating oil is used as the second temperature To2 without using the third temperature To3. The engine oil pump 126 may be started or stopped depending on whether or not the temperature Tomg is equal to or higher than a temperature (for example, 70 ° C. or 80 ° C.) indicating that the engine 22 is warmed up. Absent.

  The hybrid vehicle 20 of the embodiment includes the charging circuit 52 that can be connected to the charger 54 outside the vehicle that is connected to an external power source so that the vehicle 50 can be started with the battery 50 fully charged. The charging circuit 52 may not be provided.

  In the embodiment, the present invention is applied to the hybrid vehicle 20 in which the engine 22 and the motor MG1 are connected to the drive shaft 32 via the planetary gear mechanism 30 and the motor MG2 is connected, but the drive shaft is not provided with the motor MG1. A hybrid vehicle in which the engine and motor are connected to each other, or a hybrid that uses all of the power from the engine to generate power with a generator and charges the battery, and also uses the power from the battery to output power from the motor and travels It may be applied to automobiles.

  Moreover, it is not limited to what is applied to a hybrid vehicle, It is good also as a form of the hybrid vehicle, such as trains other than a vehicle, and the control method of such a hybrid vehicle.

  Here, the correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 22 corresponds to the “internal combustion engine”, the motor MG2 corresponds to the “electric motor”, the battery 50 corresponds to the “power storage means”, and the oil pan 112 corresponding to the “engine storage means” and “ An engine lubrication system 110 including an oil pump 114 corresponding to “engine supply means” corresponds to “engine lubrication system”, and corresponds to an oil pan 122 corresponding to “motor storage means” and “motor supply means”. Of the motor lubrication system 120 including the oil pump 124, the system excluding the oil pump 126 and the adjustment valve 128 corresponds to the “motor lubrication system”, and the oil pump 126 corresponds to the “lubricant supply unit”. Further, the oil temperature sensor 115 and the water temperature sensor 25 correspond to “engine reflected temperature detection means”, the oil temperature sensor 125 corresponds to “lubricating liquid temperature detection means”, and the lubrication control routine of FIG. 4 is executed while the motor is running. The electronic control unit 70 is equivalent to “control means”, the motor MG1 is equivalent to “second electric motor”, and the adjustment valve 128 is equivalent to “connecting valve”.

  Here, the “internal combustion engine” is not limited to an internal combustion engine that outputs power using a hydrocarbon fuel such as gasoline or light oil, and may be any type of internal combustion engine such as a hydrogen engine. The “motor” is not limited to the motor MG2 as a synchronous generator motor, and may be any type of motor as long as it can output power for traveling, such as an induction motor. The “storage means” is not limited to the battery 50 as a secondary battery, and may be anything as long as it can exchange electric power with an electric motor such as a capacitor. The “engine storage means” and the “engine supply means” are not limited to the oil pan 112 and the oil pump 114, respectively, and those that store lubricating liquid for lubricating the internal combustion engine, engine storage means As long as the lubricating liquid stored in the internal combustion engine can be supplied to the internal combustion engine as the internal combustion engine rotates, it may be any type. The “engine lubrication system” is not limited to the engine lubrication system 110, and any system having “engine storage means” and “engine supply means” may be used. It does not matter. “Motor storage means” and “motor supply means” are not limited to the oil pan 122 and the oil pump 124, respectively, and those that store a lubricating liquid for lubricating the motor, As long as the stored lubricating liquid can be supplied to the electric motor, it may be anything. The “motor lubrication system” is not limited to the motor lubrication system 120 excluding the oil pump 126 and the adjustment valve 128, but corresponds to “motor storage means” and “motor supply means”. Any device may be used as long as it has a corresponding one. The “lubricating liquid supply means” is not limited to the oil pump 126, and any means capable of supplying the lubricating liquid of the motor lubricating system to the internal combustion engine, such as an openable / closable valve or a lubricating oil scraping mechanism. It doesn't matter what. The “engine reflected temperature detection means” is not limited to the oil temperature sensor 115 and the water temperature sensor 25, and any means that detects the engine reflected temperature reflecting the temperature of the internal combustion engine may be used. . The “lubricating liquid temperature detecting means” is not limited to the oil temperature sensor 125, and any means may be used as long as it detects the lubricating liquid temperature that is the temperature of the lubricating liquid in the motor lubricating system. The “control unit” is not limited to one configured by a single electronic control unit, and may be a combination of a plurality of electronic control units. Further, the “control means” is not limited to the one that executes the lubrication control routine of FIG. 4 while the motor is running, but the operation of the internal combustion engine is stopped and the detected engine reflected temperature is set to warm the internal combustion engine. When the lubricating liquid temperature detected when the temperature is lower than the first temperature indicating the unoperated state is equal to or higher than the second temperature higher than the first temperature, the lubricating liquid of the motor lubricating system is supplied to the internal combustion engine. Any device may be used as long as it performs warm-up control for controlling the lubricant supply means. The “second electric motor” is not limited to the motor MG1 as the synchronous generator motor, and any motor that can motor the internal combustion engine using electric power from the power storage means, such as a starter motor. I do not care. The “connecting valve” is not limited to the regulating valve 128, and any valve that can be opened and closed provided in a flow path connecting the engine storage means and the motor storage means may be used.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the manufacturing industry of hybrid vehicles.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 according to an embodiment of the present invention. It is explanatory drawing which shows typically the outline of a structure of the cooling system 90 which cools the engine 22 and motor MG1, MG2. It is explanatory drawing which shows typically the outline of a structure of the motor lubricating system 110 which lubricates the engine 22, and the motor lubricating system 120 which lubricates motor MG1, MG2. 4 is a flowchart showing an example of a lubrication control routine executed by an electronic control unit 70. Description showing an example of a time change of the remaining capacity SOC of the battery 50, the lubricating oil temperature Toeg, the lubricating oil temperature Tomg, and the supply amount of the lubricating oil to the engine 22 when the engine 22 is lubricated while the motor is running. FIG.

Explanation of symbols

  20 Hybrid vehicle, 22 Engine, 23 Cylinder head, 24 Cylinder block, 25 Water temperature sensor, 26 Crankshaft, 30 Planetary gear mechanism, 32 Drive shaft, 41, 42 Inverter, 43 Water temperature sensor, 50 Battery, 52 Charging circuit, 53, 55 connector, 54 charger, 62 differential gear, 63a, 63b drive wheel, 70 electronic control unit, 72 CPU, 74 ROM, 76 RAM, 80 ignition switch, 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator Pedal position sensor, 85 Brake pedal, 86 Brake pedal position sensor, 88 Vehicle speed sensor, 90 Cooling system, 92,96 Radiator, 93 Thermostat, 4,98 water pump, 95 a heater, 110 engine lubrication system, 112 and 122 the oil pan, 114,124,126 oil pump, 115 and 125 the oil temperature sensor, 128 regulating valve, MG1, MG2 motor.

Claims (10)

A hybrid vehicle comprising an internal combustion engine, an electric motor capable of outputting driving power, and an electric storage means capable of exchanging electric power with the electric motor,
Engine storage means for storing lubricating liquid for lubricating the internal combustion engine, and engine supply means capable of supplying the lubricating liquid stored in the engine storage means to the internal combustion engine as the internal combustion engine rotates. An engine lubrication system having
Motor storage means connected to the engine storage means for storing lubricating liquid for lubricating the motor; and motor supply means capable of supplying the motor with the lubricating liquid stored in the motor storage means. Having an electric motor lubrication system;
Lubricating liquid supply means capable of supplying a lubricating liquid of the motor lubricating system to the internal combustion engine;
A hybrid car with The hybrid vehicle according to claim 1,
The lubricating liquid supply means is constituted by a pumping device or a valve that can be opened and closed capable of pumping the lubricating fluid of the motor lubrication system to the internal combustion engine, and lubrication of the motor lubrication system by driving the pumping device or opening the valve. Means for supplying liquid to the internal combustion engine,
Hybrid car. A hybrid vehicle according to claim 1 or 2,
Engine reflected temperature detecting means for detecting the engine reflected temperature reflecting the temperature of the internal combustion engine;
Lubricating liquid temperature detecting means for detecting a lubricating liquid temperature that is the temperature of the lubricating liquid in the motor lubricating system;
When the operation of the internal combustion engine is stopped and the detected engine reflected temperature is lower than a first temperature indicating that the internal combustion engine is not warmed up, the detected lubricant temperature is the first temperature. Control means for executing warm-up control for controlling the lubricating liquid supply means so that the lubricating liquid of the motor lubricating system is supplied to the internal combustion engine when the temperature is higher than the second temperature;
A hybrid car with A hybrid vehicle according to claim 3,
When the detected lubricating liquid temperature is less than a third temperature that is not less than the first temperature and less than the second temperature after the execution of the warm-up control is started, the control means And means for controlling the lubricating liquid supply means so that the supply of the lubricating liquid of the electric motor lubricating system to the internal combustion engine is stopped until the detected lubricating liquid temperature becomes equal to or higher than the second temperature.
Hybrid car. A hybrid vehicle according to claim 3 or 4,
When the detected engine reflected temperature becomes equal to or higher than the first temperature after the execution of the warm-up control, the control means supplies the lubricating fluid of the motor lubrication system to the internal combustion engine. Means for controlling the lubricating liquid supply means to be stopped;
Hybrid car. A hybrid vehicle according to any one of claims 3 to 5,
A second electric motor capable of motoring the internal combustion engine using electric power from the power storage means;
The control means is means for controlling the second electric motor so that the internal combustion engine is motored when the warm-up control is executed.
Hybrid car. A hybrid vehicle according to any one of claims 3 to 6,
The control means performs the warm-up control while controlling the internal combustion engine and the electric motor to run with power from the electric motor in accordance with an accelerator operation in a state where the operation of the internal combustion engine is stopped. Is the means to perform,
Hybrid car. The hybrid vehicle according to claim 7,
The control means is means for controlling the electric motor supply means so that the lubricating liquid from the electric motor storage means is supplied to the electric motor.
Hybrid car. A hybrid vehicle according to any one of claims 3 to 8,
A connection valve that can be opened and closed in a flow path connecting the engine storage means and the motor storage means;
The control means is means for controlling the connection valve so that the connection valve is opened when the warm-up control is executed.
Hybrid car. An internal combustion engine, an electric motor capable of outputting driving power, an electric storage means capable of exchanging electric power with the electric motor, an engine storage means for storing a lubricating liquid for lubricating the internal combustion engine, and the storage for the engine An engine lubrication system having an engine supply means capable of supplying the lubricating liquid stored in the means to the internal combustion engine as the internal combustion engine rotates, and for lubricating the electric motor connected to the engine storage means An electric motor lubrication system having an electric motor storage means for storing the lubricating liquid and an electric motor supply means capable of supplying the electric motor with the lubricating liquid stored in the electric motor storage means; A control method for a hybrid vehicle comprising a lubricating liquid supply means capable of being supplied to an engine,
When the operation of the internal combustion engine is stopped and the engine reflected temperature reflecting the temperature of the internal combustion engine is lower than a first temperature indicating a state where the internal combustion engine is not warmed up, the lubricating liquid of the motor lubrication system When the lubricating liquid temperature, which is a temperature, is equal to or higher than a second temperature higher than the first temperature, warm-up control is performed to control the lubricating liquid supply means so that the lubricating liquid of the motor lubricating system is supplied to the internal combustion engine. Execute,
A control method for a hybrid vehicle.

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