JP2020090948A - Control device for vehicular system - Google Patents

Abstract

To efficiently warm transmission oil in accordance with an outside air temperature.SOLUTION: A control device according to the present invention controls a vehicular system including: a water-cooled type engine mounted to a vehicle; a transmission connected to the engine; a water pump connected to the engine and sending cooling water to the engine; an oil warmer that exchanges heat between the cooling water flowing out from the engine and the transmission oil, where the cooling water that has undergone heat exchange is sent to the water pump; and a valve device that controls a flow rate of the cooling water flowing from the engine to the oil warmer. When the engine is started, if an outside air temperature at start of the engine is smaller than a first predetermined value, the control device brings the water pump into an operating state and opens the valve device (S5), and when the engine is started, if the outside air temperature at start of the engine is equal to or greater than the first predetermined value, the control device brings the water pump into a stopped state and closes the valve device (S9).SELECTED DRAWING: Figure 5

Description

The present invention relates to a control device for a vehicle system.

Patent Document 1 describes that when the transmission shift range is in the travel range, the oil valve is opened to increase the temperature of the oil in the transmission.

JP, 2006-200406, A

An object of the present invention is to efficiently heat transmission oil according to the outside air temperature.

A control device according to the present invention includes a water-cooled engine mounted on a vehicle, a transmission connected to the engine, a first water pump connected to the engine and sending cooling water to the engine, and the engine. An oil warmer for exchanging heat between cooling water flowing out of the engine and oil of the transmission, wherein the cooling water after heat exchange is sent to the first water pump, and the oil warmer from the engine to the oil. And a valve device for adjusting the flow rate of the cooling water flowing to the warmer. When the outside temperature at the time of starting the engine is less than a first predetermined value when the engine is started, the control device sets the first water pump to an operating state and the valve device to an open state, If the outside air temperature at the time of starting the engine is equal to or higher than the first predetermined value when the engine is started, the first water pump is stopped and the valve device is closed.

According to the present invention, the oil in the transmission can be efficiently warmed according to the outside air temperature.

It is explanatory drawing which shows the structure of a vehicle system, and the control state in a heater priority mode. It is explanatory drawing which shows the control state in engine warm-up mode. It is explanatory drawing which shows the control state in CVT warming-up mode. It is explanatory drawing which shows the control state in heat damage mode. It is a flow chart of processing by a control device. It is explanatory drawing which shows another structure of a vehicle system, and the control state in a heater priority mode. It is explanatory drawing which shows the control state in engine warm-up mode. It is explanatory drawing which shows the control state in CVT warming-up mode. It is explanatory drawing which shows the control state in heat damage mode.

Hereinafter, the present invention will be described based on the illustrated embodiments. However, the present invention is not limited to the embodiments described below.

FIG. 1 shows a vehicle system 1 and a control device 4 that is connected to the system and controls the system. The vehicle system 1 includes a water-cooled engine ENG mounted on a vehicle, a first water pump WP that sends cooling water to the engine, and a continuously variable transmission (not shown) connected to the engine. There is. Hereinafter, this continuously variable transmission is also simply referred to as "transmission".

The vehicle system 1 further includes a heater core HTR provided in a heater (heating device) for heating the passenger compartment, a transmission oil warmer TMOW for warming oil (transmission oil) in a torque converter of a transmission, and a radiator RAD. It has and. In addition, the vehicle system 1 also includes a coolant control valve device CCV.

The coolant control valve device CCV is connected to the cooling water outlet of the engine ENG and adjusts the flow rate of the cooling water flowing from the engine ENG to the heater core HTR, the transmission oil warmer TMOW, and the radiator RAD. The coolant control valve device CCV has a first valve V1, a second valve V2, and a third valve V3.

The outlet of the first valve V1 is connected to the cooling water inlet of the heater core HTR, and the cooling water outlet of the heater core is connected to the cooling water inlet of the first water pump WP.
The outlet of the second valve V2 is connected to the cooling water inlet of the transmission oil warmer TMOW, and the cooling water outlet of the transmission oil warmer is connected to the cooling water inlet of the first water pump WP.
The outlet of the third valve V3 is connected to the cooling water inlet of the radiator RAD, and the cooling water outlet of the radiator is connected to the cooling water inlet of the first water pump WP.

The first water pump WP can be a mechanical pump driven by the engine ENG. By the operation of the first water pump WP, the cooling water is sent to the engine ENG. The cooling water that has absorbed the exhaust heat of the engine ENG by flowing in the engine ENG flows out from the engine ENG and is then sent to the coolant control valve device CCV.

The cooling water that has passed through the open first valve V1 flows into the heater core HTR. In this heater core HTR, heat exchange is performed between the inflowing cooling water and the air sent into the vehicle interior. This heat exchange warms the air sent into the vehicle interior. The cooling water after the heat exchange is sent to the engine ENG via the first water pump WP.

The cooling water that has passed through the second valve V2 in the open state flows into the transmission oil warmer TMOW. In this transmission oil warmer TMOW, heat is exchanged between the inflowing cooling water and the transmission oil. This heat exchange heats the transmission oil. The cooling water after the heat exchange is sent to the engine ENG via the first water pump WP.

The cooling water that has passed through the third valve V3 in the open state flows into the radiator RAD. In this radiator RAD, the inflowing cooling water is cooled. The cooled cooling water is sent to the engine ENG via the first water pump WP.

In this way, the cooling water flowing out from the engine ENG returns to the engine ENG via the coolant control valve device CCV, the heater core HTR, the transmission oil warmer TMOW, and the radiator RAD. The flow rate of the cooling water sent to the heater core HTR is adjusted by the first valve V1, the flow rate of the cooling water sent to the transmission oil warmer TMOW is adjusted by the second valve V2, and the flow rate of the cooling water sent to the radiator RAD is the first. 3 valve V3 regulates.

The vehicle system 1 further includes a water temperature gauge 2 that measures the water temperature of the engine ENG, an outside air temperature sensor 3 that measures the outside air temperature, and an oil temperature sensor (not shown) that measures the oil temperature (oil temperature) of the transmission. Is equipped with. The measured values of the water temperature gauge 2, the outside air temperature sensor 3, and the oil temperature sensor are sent to the control device 4.

The control device 4 includes a valve device controller 41, a water pump controller 42, and a lockup instruction controller 43. The valve device controller 41 controls opening/closing of the first valve V1, the second valve V2, and the third valve V3 in the coolant control valve device CCV. The water pump controller 42 controls the operation of the first water pump WP. The lockup instruction controller 43 instructs the transmission to perform lockup and lockup cancellation. Lockup is to directly connect a pump impeller, which is an input of a torque converter of a transmission, and a turbine runner, which is an output, without using hydraulic pressure.

In the drawing, for each valve, the open state is indicated by the symbol O, and the closed state is indicated by the symbol S. In FIG. 1, the first water pump WP is operating, the first valve V1 is in the open state, and the second valve V2 and the third valve V3 are in the closed state. In this case, the cooling water flowing out from the engine ENG returns to the engine ENG via the first valve V1 and the heater core HTR. In the heater controller HTR, as described above, heat exchange is performed between the inflowing cooling water and the air sent into the vehicle interior. Such a control mode of the valve and the water pump is called a heater priority mode.

In FIG. 2, the first water pump WP is not operating, and the first valve V1, the second valve V2, and the third valve V3 are all closed. In this case, the circulation of the cooling water is stopped and the warming up of the engine ENG is promoted. Such a valve and water pump control mode is called an engine warm-up mode.

In FIG. 3, the first water pump WP is operating, the first valve V1 is in the closed state, the second valve V2 is in the open state, and the third valve V3 is in the closed state. In this case, the cooling water flowing out from the engine ENG returns to the engine ENG via the second valve V2 and the transmission oil warmer TMOW. In the transmission oil warmer TMOW, as described above, the transmission oil is warmed. Such a control mode of the valve and the water pump is called a CVT warm-up mode. CVT is a continuously variable transmission.

In FIG. 4, the first water pump WP is operating, the first valve V1 is in the closed state, and the second valve V2 and the third valve V3 are in the open state. In this case, a part of the cooling water flowing out from the engine ENG returns to the engine ENG via the second valve V2 and the transmission oil warmer TMOW, and the rest returns to the engine ENG via the third valve V3 and the radiator RAD. In the transmission oil warmer TMOW, the heat load is high and the oil temperature is higher than the water temperature, so the oil is cooled by the cooling water. The cooling water is cooled in the radiator RAD. Such a control mode of the valve and the water pump is called a heat damage mode.

2 to 4, the water temperature gauge 2, the outside air temperature sensor 3, and the control device 4 are not shown.

FIG. 5 shows a flow of processing performed by the control device 4. First, in step S1, the control device 4 determines whether or not the engine ENG is started. If it is determined that the engine ENG is started, step S2 is performed, otherwise step S1 is performed again.

In step S2, the control device 4 determines whether the heater is in the off state or the on state. When it is determined that the heater is on, step S3 is performed, and when it is determined that the heater is off, step S4 is performed.

In step S3, the valve device controller 41 and the water pump controller 42 control the valve and the water pump based on the heater priority mode shown in FIG. Then, this process ends.

When the heater is turned on by the occupant, the air to be sent into the passenger compartment is warmed in the heater core in step S3. This warming of air is prioritized over engine warm-up and CVT warm-up. As a result, comfort in the passenger compartment is prioritized, and passenger satisfaction can be increased.

In step S4, the valve device controller 41 determines whether the outside air temperature measured by the outside air temperature sensor 3 is the first predetermined value T1 or more. When it is determined that the outside air temperature is less than the first predetermined value T1, steps S5 to S8 are performed. Under a condition different from the predetermined value T1, the lockup is released when the outside air temperature becomes low.

In step S5, the valve device controller 41 and the water pump controller 42 control the valve and the water pump based on the CVT warm-up mode shown in FIG. Further, in this step, the lockup instruction controller 43 puts the transmission in the lockup released state.

According to steps S4 and S5, when the outside air temperature is low, the CVT warm-up is preferentially performed before the engine warm-up. Generally, when the outside air temperature is low, the viscosity of the transmission oil increases, and the possibility of friction increases. However, according to the above steps S4 and S5, the oil is warmed and the viscosity of the oil decreases, and friction may occur. Can be reduced. This leads to improved fuel economy.

Further, since the transmission is brought into the lockup release state, the engine speed becomes high and the oil rotates in the torque converter to generate heat, so that the oil can be heated more efficiently. This leads to a further improvement in warm-up. On the other hand, when the lockup is released, the engine speed increases and fuel is consumed. By warming up the CVT, you can raise the temperature of the transmission and lock it up quickly, which will further improve fuel efficiency.

In step S6, the valve device controller 41 determines whether the measured value of the oil temperature acquired from the oil temperature sensor is equal to or greater than the second predetermined value T2. When it is determined that the measured value of the oil temperature is not less than the second predetermined value T2, step S7 is performed, otherwise step S6 is performed again. The second predetermined value T2 can be set to 30° C., for example.

In step S7, the control device 4 determines whether or not the measured value of the water temperature acquired from the water temperature gauge 3 is the third predetermined value T3 or less. If it is determined that the measured value of the water temperature is equal to or lower than the third predetermined value T3, step S8 is performed, and if not, this process ends. The third predetermined value T3 can be set to 75° C., for example.

In step S8, the valve device controller 41 and the water pump controller 42 control the valve and the water pump based on the engine warm-up mode shown in FIG. Then, this process ends.

According to step S6, the CVT warm-up mode of step S5 is continued until the oil temperature reaches the second predetermined value T2. Then, if the oil temperature reaches the second predetermined value T2 and the water temperature of the engine is equal to or lower than the third predetermined value T3, the CVT warm-up mode is stopped and it is postponed because the priority is lower than the CVT warm-up. The engine warming up is performed in step S8.

Reference is again made to step S4. In the step, if it is determined that the outside air temperature is equal to or higher than the first predetermined value T1, steps S9 to S12 are performed. First, in step S9, the valve device controller 41 and the water pump controller 42 control the valve and the water pump based on the engine warm-up mode shown in FIG.

According to the above steps S4 and S9, when the outside air temperature is high, the engine warm-up is preferentially performed before the CVT warm-up, and the fuel economy can be expected to improve.

In step S10, the control device 4 determines whether the measured value of the water temperature acquired from the water temperature gauge 3 is the fourth predetermined value T4 or more. When it is determined that the measured value of the water temperature is equal to or higher than the fourth predetermined value T4, step S11 is performed, otherwise step S10 is performed again. The fourth predetermined value T4 can be set to 75° C., for example.

In step S11, the control device 4 determines whether the measured value of the oil temperature acquired from the oil temperature sensor is less than or equal to the fifth predetermined value T5. The fifth predetermined value T5 can be set to 50° C., for example. If it is determined that the measured value of the oil temperature is equal to or lower than the fifth predetermined value T5, step S12 is performed, otherwise, this processing ends.

In step S12, the valve device controller 41 and the water pump controller 42 control the valve and the water pump based on the CVT warm-up mode shown in FIG. Then, this process ends.

According to step S10, the engine warm-up mode of step S9 is continued until the water temperature of the engine reaches the fourth predetermined value T4. When the water temperature reaches the fourth predetermined value T4 and the oil temperature is equal to or lower than the fifth predetermined value T5, the engine warm-up mode is stopped and it is postponed because the priority is lower than the engine warm-up. CVT warm-up is performed in step S12.

According to the embodiment shown in FIGS. 1 to 5, warming the transmission oil is prioritized over warming the engine when the outside air temperature is relatively low, and warming the transmission oil over the engine when the outside air temperature is relatively high. Warm up has priority. When the outside air temperature is low, the viscosity of the transmission oil is relatively high, but the friction can be reduced by warming the engine oil and lowering the viscosity in preference to engine warm-up. This leads to improved fuel economy. Further, when the outside air temperature is high, the engine warm-up is prioritized over the warming of the transmission oil, so that the EGR (exhaust gas recirculation) timing becomes appropriate. This also leads to improved fuel economy.

The present embodiment is based on the finding that the fuel consumption improving effect is higher when the transmission oil temperature is prioritized over the engine warm-up because the oil viscosity increases when the outside air temperature is low.

In addition, either engine warm-up or CVT warm-up is prioritized according to the outside air temperature, and then the other is also performed as necessary, so that the entire power train is finally warmed and heat is released. It is possible to eliminate the bias and improve fuel efficiency.

In this way, the heat transferred from the engine to the cooling water can be distributed to the transmission oil warmer, distributed to the heater core, or redistributed to the engine. Since this distribution is appropriately performed according to the outside air temperature, fuel consumption is improved.

Next, another form of the vehicle system will be shown. As shown in FIG. 6, the vehicular system 1a includes a second water pump eWP and a thermal device TD in addition to the configuration of the vehicular system 1 shown in FIGS. The second water pump eWP can be electrically driven. The thermal device TD is a heat source different from the engine ENG, and examples thereof include a heat storage tank and an exhaust heat recovery device. The water pump controller 42 controls not only the operation of the first water pump WP but also the operation of the second water pump eWP.

The inlet of the second water pump eWP is connected to the outlet of the second valve V2 and a first connecting portion CN1 which is a connecting portion with the first cooling water inlet/outlet W1 of the transmission oil warmer TMOW. The outlet of the second water pump eWP is connected to the cooling water inlet of the thermal device TD. The cooling water outlet of the thermal device TD is connected to a second connecting portion CN2 that is a connecting portion between the second cooling water inlet/outlet W2 of the transmission oil warmer TMOW and the inlet of the first water pump WP.

FIG. 6 shows a case where the first water pump WP and the second water pump eWP are both operating, and the first valve V1 and the second valve V2 are open and the third valve V3 is closed. .. In this case, a part of the cooling water flowing out from the engine ENG returns to the engine ENG via the first valve V1 and the heater core HTR, and the rest is the second valve V2, the second water pump eWP in operation, and the thermal device TD. After that, the engine ENG is returned to. The cooling water is warmed by both the engine ENG and the thermal device TD in a relatively short time and supplied to the heater core HTR. Such a valve control mode is called a heater priority mode in the vehicle system 1a.

FIG. 7 shows a case where both the first water pump WP and the second water pump eWP are operating, only the second valve V1 is in the open state, and the first valve V1 and the third valve V3 are in the closed state. Show. In this case, the cooling water flowing out from the engine ENG returns to the engine ENG via the second valve V2, the second water pump eWP and the thermal device TD. As a result, the engine ENG can be warmed up in a shorter time than the vehicle system 1 without the thermal device TD. Such a valve control mode is called an engine warm-up mode in the vehicle system 1a.

FIG. 8 shows a case where the first water pump WP is stopped, the second water pump eWP is operating, and all of the first valve V1, the second valve V2, and the third valve V3 are closed. Show. The cooling water flowing out from the second water pump eWP in operation is warmed by the thermal device TD and flows into the second cooling water inlet/outlet W2 of the transmission oil warmer TMOW through the second connecting portion CN2. In the transmission oil warmer TMOW, heat is exchanged between the inflowing cooling water and the transmission oil to warm the transmission oil. The cooling water after the heat exchange flows from the first cooling water inlet/outlet W1 of the transmission oil warmer TMOW to the second water pump eWP in operation. Such a valve control mode is called a CVT warm-up mode in the vehicle system 1a. Since the cooling water is circulated separately from the engine ENG, the CVT warm-up and the engine ENG warm-up can be performed in parallel.

FIG. 9 shows a heat damage mode similar to that of FIG. That is, the first water pump WP is operating, the second water pump eWP is stopped, the second valve V2 and the third valve V3 are open, and the first valve V1 is closed. A part of the cooling water flowing out from the engine ENG returns to the engine ENG via the second valve V2 and the transmission oil warmer TMOW, and the rest returns to the engine ENG via the third valve V3 and the radiator RAD.

7 to 9, the water temperature gauge 2, the outside air temperature sensor 3, and the control device 4 are not shown.

The vehicle system 1 a is also controlled by the control device 4. The flow of processing performed by the control device 4 in this case is the same as in FIG.

According to the embodiment shown in FIGS. 6 to 9, not only the heat transferred from the engine to the cooling water but also the heat transferred from the thermal device to the cooling water is distributed to the transmission oil warmer and distributed to the heater core. , Or redistributed to the engine.

The transmission oil warmer can be simply called an oil warmer.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.

1 Vehicle system ENG Engine WP 1st water pump HTR Heater core TMOW Transmission oil warmer RAD Radiator CCV Coolant control valve device V1 to V3 Valve 2 Water temperature gauge 3 Outside air temperature sensor

4 Control device 41 Valve device controller 42 Water pump controller 43 Lock-up instruction controller

1a Cooling system eWP Second water pump TD Thermal device

Claims (7)

A water-cooled engine mounted on the vehicle,
A transmission connected to the engine,
A first water pump connected to the engine for sending cooling water to the engine;
An oil warmer that performs heat exchange between cooling water flowing out of the engine and oil of the transmission, wherein the cooling water after heat exchange is sent to the first water pump,
A control device for controlling a vehicle system including a valve device for adjusting a flow rate of the cooling water flowing from the engine to the oil warmer,
When the outside temperature at the time of starting the engine is less than a first predetermined value when the engine is started, the first water pump is in an operating state and the valve device is in an open state,
When the outside temperature at the time of starting the engine is equal to or higher than the first predetermined value when the engine is started, the control device sets the first water pump to a stopped state and the valve device to a closed state. The control device according to claim 1, wherein the lockup of the transmission is released if the outside air temperature at the time of starting the engine is less than the first predetermined value. When the outside air temperature at the time of starting the engine is less than the first predetermined value, the first water pump is operated and the valve device is opened, so that the temperature of the oil is set to the second predetermined value. The control device according to claim 1 or 2, wherein when the water temperature of the engine reaches a value and the water temperature of the engine is equal to or lower than a third predetermined value, the first water pump is stopped and the valve device is closed. When the outside air temperature at the time of starting the engine is equal to or higher than the first predetermined value, the first water pump is stopped and the valve device is closed, whereby the water temperature of the engine is set to the fourth predetermined value. When the temperature reaches a value and the temperature of the oil is equal to or lower than a fifth predetermined value, the first water pump is activated and the valve device is opened. Control device. A water-cooled engine mounted on the vehicle,
A transmission connected to the engine,
A first water pump connected to the engine for sending cooling water to the engine;
An oil warmer that performs heat exchange between cooling water flowing out of the engine and oil of the transmission, wherein the cooling water after heat exchange is sent to the first water pump,
A valve device for adjusting the flow rate of the cooling water flowing from the engine to the oil warmer,
A second water pump having an inlet connected to a connection portion between the valve device and the oil warmer;
A thermal device which is connected to an outlet of the second water pump and warms cooling water flowing from the second water pump, wherein an outlet of the thermal device is provided at a connection portion between the oil warmer and the first water pump. A control device for controlling a system for a vehicle, which is connected with a thermal device,
A control device that controls the first water pump, the second water pump, and the valve device when the engine is started, in accordance with an outside air temperature when the engine is started. When the outside temperature at the time of starting the engine is equal to or higher than the first predetermined value when the engine is started, the first water pump and the second water pump are in an operating state and the valve device is in an open state. The control device according to claim 5. When the outside air temperature at the time of starting the engine is less than the first predetermined value when the engine is started, the first water pump is stopped and the second water pump is operated, and the valve device is operated. The control device according to claim 5 or 6, which closes.