JP2012211536A - Engine-waste-heat-recovery engine-cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and rapidly increase temperature of lubricant oil of a transmission or an engine.SOLUTION: An engine-waste-heat-recovery engine-cooling device includes: a main water pump 2 sending cooling water to the engine; a water delivery pipe 7 in which cooling water from the engine gathers; a radiator water passage refluxing the cooling water of the water delivery pipe to the water pump via a radiator 9; a bypass water passage 11 refluxing the cooling water of the water delivery pipe to the water pump not via the radiator; water circulating passages 21, 22 and 31 to 34 formed between the engine and heat exchangers 14 and 18 of a transmission oil or an engine oil; and sub water pumps 20 and 30 circulating water in the water circulating passages between the engine and the heat exchangers. Thermostats 23 and 35 block off a water passage connecting the engine and the water delivery pipe from each other at a prescribed temperature or below and the sub water pumps are driven.

Description

  The present invention relates to a waste heat recovery and cooling device for an engine mounted on a vehicle.

A water-cooled internal combustion engine mounted on a vehicle such as an automobile is provided with a cooling water passage through which cooling water circulates around combustion chambers and cylinders. It is cooled by heat exchange.
This cooling water is also used for heating the passenger compartment by passing water through the heater core.
In recent years, it has been proposed to improve the fuel efficiency of a vehicle by utilizing the waste heat of the engine recovered by cooling water.

  In Patent Documents 1-3, cooling water that has absorbed heat by passing through a cylinder block and a cylinder head is circulated through a heat exchanger with transmission oil to raise the temperature of the transmission oil and reduce the viscosity of the transmission oil. This reduces friction loss and improves fuel economy and switching operability.

JP 2005-83225 A JP 2009-062836 A JP 2008-157102 A

However, in the invention described in Patent Document 1, the cooling water that has absorbed heat by passing water through the engine passes through the heater core for heating and is then introduced into the heat exchanger for transmission oil.
In the inventions described in Patent Documents 2 and 3, the cooling water that has absorbed heat by passing through the engine is distributed not only to the heat exchanger for transmission oil but also to other water channels such as a heater core.
Also, the reflux water passage from the heat exchanger of the transmission oil to the engine is sent out by the common water pump provided in the water passage that is merged with the cooling water passage that has passed through other heat radiating elements such as the heater core, and is again returned to the cylinder head. To reflux.
Therefore, from the viewpoint of warming the transmission oil by the heat of the cylinder head, it is not preferable to use it in other heat exchangers, and since it passes through other heat exchangers, branch paths, and combined flow paths, it operates in circulation. The road becomes long and the amount of water to circulate is large and not efficient. Depending on the amount of water and the circulation path length, the heat capacity of the heating target is large, and it takes a longer time to raise the transmission oil to a desired temperature.

  The present invention has been made in view of the above-described problems in the prior art. When the transmission or engine lubricating oil is in a low temperature state with respect to an ideal temperature range, the temperature can be increased efficiently and quickly. It is an object of the present invention to provide an engine waste heat recovery cooling device that can be used.

The invention according to claim 1 for solving the above-described problems includes a main water pump for sending cooling water to the engine,
A water delivery pipe for collecting cooling water from the engine;
A radiator water channel for returning the cooling water in the water delivery pipe to the water pump via a radiator;
A bypass water channel that recirculates the cooling water in the water delivery pipe to the water pump without using a radiator;
A water circuit formed between the engine and a heat exchanger for transmission oil or engine oil;
An engine waste heat recovery and cooling device including a sub-water pump that circulates cooling water in the water circulation path between the engine and the heat exchanger.

  The invention according to claim 2 is provided with a thermostat that cuts off a water passage connecting the engine and the water delivery pipe at a predetermined temperature or lower, and the sub-water pump is operated at the predetermined temperature or lower. It is a waste heat recovery cooling device of the engine described in 1.

  According to the present invention, the cooling water is circulated between the engine and the transmission oil or the heat exchanger for engine oil without passing through the bypass water channel and the main water pump, as well as the water delivery pipe and the radiator water channel. Since the water circulation path and the sub water pump are provided, the cooling water is circulated exclusively or preferentially in this water circulation path when the transmission or engine lubricating oil is in a low temperature state with respect to an ideal temperature range. Thus, there is an effect that the temperature of the oil can be raised efficiently and quickly.

It is a water circuit diagram of the waste heat recovery cooling device of the engine concerning one embodiment of the present invention.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

FIG. 1 shows a water circuit diagram of the waste heat recovery and cooling device for an engine of the present embodiment.
The engine waste heat recovery and cooling device according to the present embodiment is provided in a water-cooled internal combustion engine such as a diesel engine or a gasoline engine that is mounted as a driving power source for an automobile such as a passenger car.
In the present embodiment, a case where the present invention is applied to a horizontally opposed engine including a pair of left and right cylinders and a head will be described as an example, but the present invention is not limited to this.

The parts of the engine body that constitute the cooling water channel are the cylinder blocks 4L and 4R and the cylinder heads 5L and 5R.
The waste heat recovery and cooling device includes a main water pump 2, an LH water separation chamber 3L, an RH water separation chamber 3R, a cylinder block 4L, a cylinder block 4R, a cylinder head 5L, a cylinder head 5R, a water transfer pipe 7, a radiator water channel 8, A radiator 9, a reserve tank 10, a bypass water channel 11, a thermostat 12, a CVT warmer 14, a heater core 15, a valve 16, a thermal relay 17, an oil cooler 18, and the like are provided.

  Furthermore, this waste heat recovery cooling device includes water circulation paths 21 and 22 formed between the cylinder head 5R and the CVT warmer 14, and the water circulation path 21 is provided with a sub-water pump 20. The waste heat recovery and cooling device includes water circulation paths 31 to 34 formed between the cylinder head 5L and the oil cooler 18, and the water circulation path 31 is provided with a sub-water pump 30. The waste heat recovery / cooling apparatus further includes thermostats 23, 35, and 36.

  The main water pump 2 is driven by the output shaft of the engine and discharges cooling water. As the cooling water, for example, a liquid having antifreeze properties such as a long life coolant (LLC) is used.

  The LH water separation chamber 3L and the RH water separation chamber 3R distribute cooling water supplied from the main water pump 2 to the left and right cylinder blocks 4L and 4R and the cylinder heads 5L and 5R, respectively.

The left and right cylinder blocks 4L and 4R are formed with a cylinder into which the left and right pistons are inserted, a cooling water passage for cooling the cylinder, and the like.
The left and right cylinder heads 5L and 5R are provided in the left and right cylinder blocks 4L and 4R, respectively. The left and right cylinder heads 5L and 5R are provided with combustion chambers, intake / exhaust ports, valve drive mechanisms, fuel injection devices, and the like, and cooling water passages for cooling the combustion chambers and the exhaust ports are formed.
The cylinder blocks 4L and 4R and the cylinder heads 5L and 5R are cooled by passing the cooling water sent from the main water pump 2.

  The water delivery pipe 7 is a portion where cooling water discharged from the cylinder blocks 4L and 4R and the cylinder heads 5L and 5R gathers, and constitutes a part of the main cooling water passage of the engine.

The radiator water channel 8 is a water channel that supplies the cooling water discharged from the water delivery pipe 7 to the radiator 9 and returns it to the main water pump 2.
The radiator 9 is a heat exchanger that cools the cooling water supplied from the radiator water channel 8 by heat exchange with traveling wind. The cooling water cooled in the radiator 9 returns to the main water pump 2.
The reserve tank 10 is an auxiliary tank that is connected to the radiator 9 and temporarily stores excess cooling water.

The bypass water channel 11 is a water channel for returning the cooling water from the water delivery pipe 7 to the main water pump 2 without passing through the radiator 9.
The thermostat 12 blocks the water channel from the radiator 9 when the cooling water temperature is low. At this time, the cooling water from the water delivery pipe 7 is returned to the main water pump 2 from the bypass water channel 11. Further, when the cooling water temperature is higher than a predetermined temperature, the thermostat 12 opens the water channel from the radiator 9 and returns the cooling water that has passed through the radiator to the main water pump 2.

  The CVT warmer 14 performs heat exchange between the coolant discharged from the cylinder head 5R and transmission oil (CVT fluid), which is lubricating oil of a continuously variable transmission (CVT) (not shown) that increases and decreases the output of the engine. It is an exchanger.

The heater core 15 is a heat exchanger that performs heat exchange between the cooling water of the engine and air blown by a blower, and heats the passenger compartment.
The inlet side piping of the heater core 15 is connected to the water delivery pipe 7 via the valve 16.
The outlet side piping of the heater core 15 is connected to the thermostat 12, and the cooling water discharged from the heater core 15 is returned to the main water pump 2 via the thermostat 12.

  The thermal relay 17 is provided in the middle of the pipe connecting the water delivery pipe 7 and the outlet pipe of the heater core 15, and turns on / off an electric fan (not shown) facing the radiator 9 according to the cooling water temperature.

  The oil cooler 18 cools engine oil that is lubricating oil of the engine with cooling water discharged from the main water pump 2. A thermostat 36 is provided in a water channel that connects the outlet side of the main water pump 2 and the inlet side of the oil cooler 18 without using a cylinder block and a head. The cooling water discharged from the oil cooler 18 is introduced into the outlet side piping of the heater core 15.

The water circulation paths 21 and 22 include a water path 21 that connects the exit side of the cylinder head 5R and the entry side of the CVT warmer 14, and a water path 22 that connects the exit side of the CVT warmer 14 and the entry side of the cylinder head 5R. Each of the water channel 21 and the water channel 22 is a water channel directly connected to the cylinder head 5R and the CVT warmer 14 without reaching another heat exchanger, a branch channel, or a combined channel.
The sub water pump 20 is provided in the water passage 21 and circulates the cooling water between the cylinder head 5R and the CVT warmer 14 through the water circulation passages 21 and 22. As the sub water pump 20, a small pump having a lower capacity than the main water pump 2 is applied.
The thermostat 23 is provided in the water path from the cylinder block 4R and the cylinder head 5R to the water delivery pipe 7.

The water circulation path 31-34 includes a water path 31 connecting the outlet side of the cylinder head 5L and the inlet side of the oil cooler 18, a water path 32 connecting the outlet side of the oil cooler 18 and the outlet pipe of the heater core 15, a water path 32, A part of the outlet pipe branched from the outlet side pipe of the heater core 15 downstream from the water path 32 and connected to the inlet side of the cylinder head 5L and the outlet side pipe from the junction with the water path 32 to the branch part with the water path 34 33.
The sub water pump 30 is provided in the water passage 31 and circulates the cooling water between the cylinder head 5L and the oil cooler 18 through the water circulation passages 31-34. As the sub water pump 30, a small pump having a lower capacity than the main water pump 2 is applied.
The thermostat 35 is provided in the water path from the cylinder block 4L and the cylinder head 5L to the water delivery pipe 7.
A part of the water channel 31 downstream of the sub-water pump 30 and the water channel 32 are shared with a route reaching the outlet side piping of the heater core 15 via the thermostat 36.

  The operation of the waste heat recovery / cooling apparatus having the above-described configuration for preferentially raising the temperature of transmission oil or engine oil immediately after the engine is started will be described below.

When the transmission oil or engine oil is below a predetermined temperature after the engine is started, the thermostats 23, 35, and 36 close the water passages, and the engine control device operates the sub water pump 20 and the sub water pump 30.
When the thermostat 23 is closed and the sub water pump 20 is operated, the cooling water is circulated from the cylinder head 5R to the water passage 21, the CVT warmer 14, the water passage 22, the cylinder head 5R again. Accordingly, the transmission oil is warmed in the CVT warmer 14 by the heat of the cylinder head 5R through the coolant, and the temperature rises.
Further, when the thermostat 35 is closed and the sub water pump 30 is operated, the water path 31, the oil cooler 18, the water path 32, the water path 33, the water path 34, the cylinder head 5L, and the cooling water circulate again from the cylinder head 5L. To do. Therefore, the engine oil is warmed in the oil cooler 18 by the heat of the cylinder head 5L through the cooling water, and the temperature rises.

  As described above, not only the water delivery pipe 7 and the radiator water channel 8 but also the bypass port 11 and the main water pump 2 do not pass between the engine cylinder head and the heat exchangers 14 and 18 for transmission oil or engine oil. The cooling water can be circulated between them, and when the transmission and engine lubricating oil is at a low temperature with respect to the ideal temperature range, the cooling water is circulated exclusively or preferentially in this water circulation path, thereby improving the efficiency. The oil can be heated up quickly and well. Compared with the case of returning to the main water pump 2, since the amount of water to be circulated is small and the circulation path length is short, the heat capacity of the heating target is small, and the transmission oil and engine oil can be heated to a desired temperature in a short time. .

In the above embodiment, the water circulation for the oil temperature increase by the sub water pump is performed on the CVT warmer 14 and the oil cooler 18, but the water circulation may be performed on only one of them.
In the above embodiment, the cylinder block is not arranged in the water circulation path by the sub-water pump. However, the cylinder block may be included in the same path.

2 Main water pumps 4L, 4R Cylinder blocks 5L, 5R Cylinder head 8 Radiator water passage 11 Bypass water passage 20 Sub water pumps 21, 22 Water circulation passage 30 Sub water pumps 31-34 Water circulation passage

Claims (2)

A main water pump that delivers cooling water to the engine;
A water delivery pipe for collecting cooling water from the engine;
A radiator water channel for returning the cooling water in the water delivery pipe to the water pump via a radiator;
A bypass water channel that recirculates the cooling water in the water delivery pipe to the water pump without using a radiator;
A water circuit formed between the engine and a heat exchanger for transmission oil or engine oil;
A waste heat recovery and cooling device for an engine, comprising: a sub-water pump that circulates cooling water in the water circulation path between the engine and the heat exchanger. 2. The engine waste heat recovery according to claim 1, further comprising: a thermostat that cuts off a water passage connecting the engine and the water delivery pipe at a predetermined temperature or lower, and the sub water pump is operated at the predetermined temperature or lower. Cooling system.

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