KR101509685B1 - Exhaust heat recovery system of vehicle and method - Google Patents

Exhaust heat recovery system of vehicle and method Download PDF

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Publication number
KR101509685B1
KR101509685B1 KR20090118730A KR20090118730A KR101509685B1 KR 101509685 B1 KR101509685 B1 KR 101509685B1 KR 20090118730 A KR20090118730 A KR 20090118730A KR 20090118730 A KR20090118730 A KR 20090118730A KR 101509685 B1 KR101509685 B1 KR 101509685B1
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KR
South Korea
Prior art keywords
cooling water
temperature
engine
amount
exhaust heat
Prior art date
Application number
KR20090118730A
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Korean (ko)
Other versions
KR20110062138A (en
Inventor
황순현
이봉상
Original Assignee
현대자동차 주식회사
기아자동차 주식회사
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Application filed by 현대자동차 주식회사, 기아자동차 주식회사 filed Critical 현대자동차 주식회사
Priority to KR20090118730A priority Critical patent/KR101509685B1/en
Publication of KR20110062138A publication Critical patent/KR20110062138A/en
Application granted granted Critical
Publication of KR101509685B1 publication Critical patent/KR101509685B1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00Cooling circuits using auxiliaries
    • F01P2060/08Cabin heater
    • Y02T10/16

Abstract

The present invention relates to an exhaust heat recovery apparatus for a vehicle, which is capable of actively controlling the amount of cooling water circulating through an exhaust heat exchanger and an engine in accordance with the temperature condition of cooling water, thereby improving fuel economy and stabilizing the emission.
The present invention relates to a method for controlling an engine, comprising the steps of: detecting a temperature of a cooling water according to an engine start-up and comparing the detected temperature with a reference temperature of a warm-up determination; And adjusting the amount of cooling water circulating the engine more than the amount of cooling water circulating in the exhaust heat exchanger if the reference temperature is exceeded due to the temperature rise of the cooling water.
Water pump, exhaust heat, control valve, cooling water circulation, warm up

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery apparatus for a vehicle, and more particularly to an exhaust heat recovery apparatus for a vehicle, which is capable of actively controlling the amount of cooling water circulating through an exhaust heat exchanger and an engine, And to a recovery device and method.

Currently, vehicle makers are undergoing various R & D efforts to achieve both goals, as exhaust gas regulation and fuel efficiency improvement become more important in the process of vehicle development.

In the case of increasing the catalyst loading amount in the exhaust system or increasing the capacity of the EGR cooler in order to meet the emission regulation, the fuel cost is deteriorated as the weight of the vehicle is increased, and the production cost of the vehicle is increased.

In recent years, a variable water pump applied to a vehicle has been proposed to prevent unnecessary cooling of the engine, thereby shortening the warm-up time of the engine, thereby reducing heat loss and realizing early reduction of frictional resistance.

Generally, the heat generated by the start-up of the engine is the energy used to raise the temperature of the engine, the energy used to overcome the friction, the piston to operate, or to move various instruments (such as CAMs, etc.) Energy, and exhaust gas energy.

The above-mentioned energies correspond to loss and the ready energy for the next order of work, but the exhaust gas energy is the net loss energy when the role of heating the catalyst is completed.

As described above, an exhaust heat recovery apparatus for recovering a net loss of exhaust gas energy has been developed and applied. The exhaust heat recovery apparatus is installed at the rear end of the catalyst to transfer heat energy of the exhaust gas discharged to the cooling water side, By performing the function of raising the temperature early, it is possible to control the shortening of the warm-up time of the engine.

In addition, when the engine is cooled, the variable water pump is not operated in order to shorten the warm-up time of the engine. To this end, electricity must be applied to the magnetic coil of the variable water pump.

However, since the state of the battery voltage changes depending on the conditions of the outside temperature and the cooling water being turned on in the cold state, a phenomenon occurs in which electric energy is generated by driving the alternator and then supplied to the magnetic coil of the variable water pump.

As a result, even if the warm-up time of the engine is shortened through idling of the variable-type water pump in the state of cold start to reduce the heat loss, since a larger load is applied to produce electricity to be supplied to the magnetic coils of the variable water pump, There is a problem that a result is not generated.

However, there is a problem that unnecessary heat loss is inevitably generated when the variable water pump is driven.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide an engine control system and a control method thereof, which actively controls the amount of cooling water circulating through an exhaust heat exchanger and an engine, .

That is, in order to maximize the energy efficiency, a small amount of cooling water is circulated to the engine at the beginning of cold start, and a large amount of cooling water is circulated to the exhaust heat exchanger to ensure maximum energy efficiency.

In order to achieve the above-mentioned object, an exhaust heat recovery apparatus for a vehicle according to a feature of the present invention comprises: a radiator circulating cooling water absorbing combustion heat of an engine to radiate heat; An exhaust heat exchanger mounted on a rear end of the catalyst for transferring heat energy of the exhaust gas to cooling water circulated to increase the temperature of the cooling water; A first valve for circulating cooling water, which absorbs combustion heat of the engine, to a radiator or a bypass line; A water pump circulating the cooling water; And a water temperature sensor for detecting the temperature of the cooling water,

A second valve connected to the water pump and mounted on a distribution line for distributing the cooling water supplied by the operation of the water pump to the engine and the exhaust heat exchanger; And a controller for adjusting the amount of the cooling water circulated to the engine and the exhaust heat exchanger by adjusting the first valve according to the temperature of the cooling water detected by the water temperature sensor.

A method for recovering exhaust heat of a vehicle according to an aspect of the present invention includes the steps of detecting a temperature of a cooling water according to a start-up of an engine and comparing the temperature of the cooling water with a reference temperature of a warm- Adjusting the amount of the cooling water circulating the engine to a greater amount than the amount of the cooling water circulating the exhaust heat exchanger when the temperature of the cooling water is lower than the reference temperature; And increasing the amount of the cooling water circulating the engine more than the amount of cooling water circulating in the exhaust heat exchanger if the reference temperature is exceeded due to the temperature rise of the cooling water.

According to the above-described structure, the present invention provides an effect of actively controlling the circulation of the cooling water at the start of the engine to shorten the activation time of the engine, thereby improving the fuel economy and shortening the activation time of the catalyst It is expected.

The present invention provides a stable emission without addition of a loading amount of the catalyst, thereby providing a cost reduction, and it is possible to rapidly raise the temperature of the engine oil, thereby reducing oil friction and minimizing wear of each driven component, thereby improving durability Is expected to be effective.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

The present invention can be embodied in various different forms, and thus the present invention is not limited to the embodiments described herein.

1 is a view schematically showing an exhaust heat recovery apparatus for a vehicle according to an embodiment of the present invention.

The present invention relates to an air conditioning system comprising an engine (10), a radiator (20), an exhaust heat exchanger (30), an auxiliary device (40), a water pump (50), a water temperature sensor (60), a control part (70) 2 valve (90).

The radiator 20 sufficiently warms up the engine 10 to dissipate the heat absorbed by the cooling water in which the circulation of the cooling water absorbing the combustion heat is performed.

The exhaust heat exchanger 30 is installed at the rear end of the catalyst and is provided with circulation of cooling water. The heat energy of the exhaust gas is transferred to the circulating cooling water at an early stage of engine startup to raise the temperature of the cooling water early, .

The auxiliary mechanism (40) provides heating through the circulation of the cooling water to a heater or the like for heating the interior of the vehicle.

The water pump 50 is constituted by a variable water pump and is turned off under an initial condition in which the temperature of the cooling water does not rise above a predetermined temperature even when the engine 10 is turned on so that circulation of the cooling water is not provided, Thereby shortening the warm-up time of the engine 10 to reduce the heat loss and at the same time to realize the early reduction of the frictional resistance, thereby improving the fuel economy.

The temperature sensor 60 detects the temperature of the circulating cooling water and provides the control unit 70 with information on the detected temperature.

The controller 70 controls the operation of the water pump 50 and the operation of the first valve 80 and the second valve 90 according to the temperature of the cooling water detected by the temperature sensor 60 when the engine 10 is turned on So as to realize the warm-up time of the engine 10 and the early activation of each part of the engine 10.

The first valve (80) is installed in the circulation line of the cooling water, and determines the circulation path of the cooling water under the control of the controller (80).

For example, in a normal operating condition in which the engine 10 is fully warmed up, the cooling water is circulated through the radiator 20, and when the engine 10 is not sufficiently warmed up, Cycle through the bypass line.

At this time, cooling water circulation is performed in the auxiliary mechanism (40) according to the situation.

The second valve 90 is constituted by an electronic control valve and is installed in the cooling water circulation path of the water pump 50 and the engine 10 and the exhaust heat exchanger 30. The second valve 90 is connected to the water pump 50 under the control of the control unit 70, Thereby adjusting the flow path of the cooling water circulated by the operation of FIG.

For example, when the temperature of the cooling water is lower than the set temperature and the engine 10 is not sufficiently warmed up, the amount of cooling water circulating in the engine 10 under the control of the controller 70 is lower than the amount of cooling water circulating in the engine 10 The amount of the circulating cooling water is increased to induce a rapid temperature rise of the cooling water.

When the temperature of the cooling water exceeds the set temperature and the warming up of the engine 10 is completed, the amount of cooling water circulating through the exhaust heat exchanger 30 is minimized or cut off under the control of the controller 70, Thereby maximizing the amount of cooling water circulating in the circulation passage.

The first valve 80 and the second valve 90 may be implemented with an ordinary thermostat or an electronic valve operated under the control of the controller 70.

The operation of the present invention including the above-described functions will be described with reference to FIG.

The control unit 70 detects the temperature of the cooling water provided by the water temperature sensor 60 (S103) when the start-up of the engine 10 is detected (S102) , It is determined whether the temperature of the cooling water is lower than the reference temperature (A DEG C) which is the cold start determination condition (S104).

If it is determined in step S104 that the temperature of the cooling water exceeds the reference temperature (A DEG C), a normal cooling water circulation control for controlling the operation of the first valve 80 is performed according to the temperature of the cooling water (S105).

However, when the temperature of the cooling water is lower than the reference temperature (A 占 폚) in the determination of S104, it is determined that the engine is cold start (S106), the first valve 80 is controlled (S107), the cooling water does not circulate the radiator 20 And circulated through the bypass line (S108).

The control unit 70 controls the second valve 90 at the same time (S110) so that the water pump 50 is turned on to enable the circulation of the cooling water (S109) The amount of the cooling water circulating in the exhaust heat exchanger 30 is larger than the amount of the cooling water in the exhaust heat exchanger 30 (S111).

Therefore, it is determined whether the temperature of the cooling water has risen due to the circulation of the exhaust heat exchanger 30 and the combustion heat of the engine 10 to exceed the reference temperature (B 占 폚) of the warm-up determination (S112).

If the temperature of the cooling water exceeds the reference temperature (B 占 폚) in S112, the controller 70 determines that the engine 10 has been warmed up (S113), controls the first valve 80 (S114) The cooling water is circulated to the radiator 20 (S115).

At the same time, the amount of the cooling water circulating in the exhaust heat exchanger 30 is minimized or blocked by controlling the second valve 90 (S116), and the amount of the cooling water circulating the engine 10 is maintained at the maximum (S117).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is included in the scope of right.

1 is a view schematically showing an exhaust heat recovery apparatus for a vehicle according to an embodiment of the present invention.

2 is a flowchart illustrating an exhaust heat recovery procedure in a vehicle according to an embodiment of the present invention.

Claims (5)

  1. A radiator circulating the cooling water absorbing combustion heat of the engine to radiate heat;
    An exhaust heat exchanger mounted on a rear end of the catalyst for transferring heat energy of the exhaust gas to cooling water circulated to increase the temperature of the cooling water;
    A first valve for circulating cooling water, which absorbs combustion heat of the engine, to a radiator or a bypass line;
    A water pump circulating the cooling water;
    A water temperature sensor for detecting the temperature of the cooling water;
    / RTI >
    A second valve connected to the water pump and mounted on a distribution line for distributing the cooling water supplied by the operation of the water pump to the engine and the exhaust heat exchanger;
    A controller for adjusting the amount of the cooling water circulated to the engine and the exhaust heat exchanger by adjusting the first valve according to the temperature of the cooling water detected by the water temperature sensor;
    Further comprising:
    Wherein the controller controls the second valve to adjust the amount of cooling water circulating in the exhaust heat exchanger more than the amount of cooling water circulating in the engine when the temperature of the cooling water is less than the reference temperature.
  2. delete
  3. The method according to claim 1,
    Wherein the controller controls the second valve to minimize or shut off the amount of cooling water circulating through the exhaust heat exchanger and to adjust the amount of cooling water circulating the engine to the maximum when the temperature of the cooling water exceeds the reference temperature Exhaust heat recovery device.
  4. Detecting the temperature of the cooling water in accordance with the start-up of the engine and comparing the detected temperature with the reference temperature of the warm-up determination;
    Adjusting the amount of the cooling water circulating the engine to a greater amount than the amount of the cooling water circulating the exhaust heat exchanger when the temperature of the cooling water is lower than the reference temperature;
    Adjusting the amount of cooling water circulating in the engine more than the amount of cooling water circulating in the exhaust heat exchanger if the reference temperature is exceeded due to the temperature rise of the cooling water;
    And exhausting the exhaust heat.
  5. 5. The method of claim 4,
    Wherein the adjustment of the amount of cooling water circulated to the engine and the exhaust heat exchanger according to the temperature of the cooling water is performed by a second valve installed in a branch line connected to the water pump.
KR20090118730A 2009-12-02 2009-12-02 Exhaust heat recovery system of vehicle and method KR101509685B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20090118730A KR101509685B1 (en) 2009-12-02 2009-12-02 Exhaust heat recovery system of vehicle and method

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20090118730A KR101509685B1 (en) 2009-12-02 2009-12-02 Exhaust heat recovery system of vehicle and method
US12/847,728 US20110126783A1 (en) 2009-12-02 2010-07-30 Exhaust Heat Recovery System of Vehicle and Method Thereof
CN2010102527868A CN102086797A (en) 2009-12-02 2010-08-13 Exhaust heat recovery system of vehicle and method thereof
DE102010037090A DE102010037090A1 (en) 2009-12-02 2010-08-20 System and method for exhaust heat recovery of a vehicle

Publications (2)

Publication Number Publication Date
KR20110062138A KR20110062138A (en) 2011-06-10
KR101509685B1 true KR101509685B1 (en) 2015-04-06

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US (1) US20110126783A1 (en)
KR (1) KR101509685B1 (en)
CN (1) CN102086797A (en)
DE (1) DE102010037090A1 (en)

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DE102010037090A1 (en) 2011-06-09
KR20110062138A (en) 2011-06-10
US20110126783A1 (en) 2011-06-02
CN102086797A (en) 2011-06-08

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