KR101326817B1 - Method for reducing catalyst time of vehicle - Google Patents

Method for reducing catalyst time of vehicle Download PDF

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Publication number
KR101326817B1
KR101326817B1 KR1020110089048A KR20110089048A KR101326817B1 KR 101326817 B1 KR101326817 B1 KR 101326817B1 KR 1020110089048 A KR1020110089048 A KR 1020110089048A KR 20110089048 A KR20110089048 A KR 20110089048A KR 101326817 B1 KR101326817 B1 KR 101326817B1
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South Korea
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catalyst
vehicle
oxygen sensor
temperature
output value
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KR1020110089048A
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Korean (ko)
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KR20130025625A (en
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박명수
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현대자동차주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

차량의 촉매 활성 시간 단축 방법이 개시된다. 차량의 촉매 활성 시간 단축 방법은, (a) 차량 촉매의 전방에 설치된 전방 산소센서와 차량 촉매의 후방에 설치된 후방 산소센서의 출력값을 비교하는 단계와, (b) 상기 (a) 단계의 후방 산소센서의 출력값을 상기 전방 산소센서의 출력값으로 나눈 값이의 비율이 설정값을 초과하면 상기 촉매의 온도를 상승시키는 단계를 포함한다. A method of shortening the catalyst activation time of a vehicle is disclosed. The method for shortening the catalyst activation time of a vehicle includes: (a) comparing the output values of the front oxygen sensor installed in front of the vehicle catalyst with the rear oxygen sensor installed at the rear of the vehicle catalyst; and (b) the rear oxygen of step (a). And increasing the temperature of the catalyst when the ratio of the value of the output value of the sensor divided by the output value of the front oxygen sensor exceeds a set value.

Description

차량의 촉매 활성 시간 단축 방법{METHOD FOR REDUCING CATALYST TIME OF VEHICLE}How to reduce catalyst activation time in vehicles {METHOD FOR REDUCING CATALYST TIME OF VEHICLE}

본 발명은 차량 촉매의 열화 상태를 파악하여, 촉매의 열화 진행시에만 촉매 온도를 상승시키는 작동을 실시하는 차량의 촉매 활성 시간 단축 방법에 관한 것이다. The present invention relates to a method for shortening the catalyst activation time of a vehicle which grasps the deterioration state of the vehicle catalyst and performs an operation of raising the catalyst temperature only when the catalyst is deteriorated.

일반적으로 차량의 촉매는 엔진으로부터 배출된 유해 성분의 배기가스를 배기 계통에서 산화 및 환원 반응으로 배출하는 작용을 한다. In general, the catalyst of the vehicle serves to discharge the exhaust gas of harmful components emitted from the engine by the oxidation and reduction reaction in the exhaust system.

촉매는 활성 시간을 단축하기 위해 촉매의 온도를 향상시키는 방법을 주로 이용한다. 이러한 촉매는 열화 상태의 판단 없이 일률적으로 촉매의 온도를 상승시킨다. The catalyst mainly uses a method of improving the temperature of the catalyst in order to shorten the activation time. Such a catalyst raises the temperature of the catalyst uniformly without judging the deterioration state.

그러나, 온도 상승 작용이 필요 없는 비열화 상태의 촉매의 경우에도 공회전 상태에서 엔진 구동에 의해 촉매의 온도를 상승시키게 됨으로써, 엔진 효율이 저하되는 문제점이 있다.However, even in the case of a catalyst in a deteriorated state that does not require a temperature raising action, there is a problem that the engine efficiency is lowered by increasing the temperature of the catalyst by driving the engine in an idle state.

본 발명의 일 실시예는 촉매의 열화 진행 상태를 파악하여, 촉매의 열화 상태에 도달 시에만 촉매 온도를 상승시키는 차량의 촉매 활성 시간 단축 방법을 제공하고자 한다.An embodiment of the present invention is to provide a method for shortening the catalyst activation time of a vehicle by determining the progress of deterioration of the catalyst and raising the catalyst temperature only when the deterioration state of the catalyst is reached.

본 발명의 일 실시예는, (a) 차량 촉매의 전방에 설치된 전방 산소센서와 차량 촉매의 후방에 설치된 후방 산소센서의 출력값을 비교하는 단계와, (b) 상기 (a) 단계의 후방 산소센서의 출력값을 상기 전방 산소센서의 출력값으로 나눈 값의 비율이 설정값을 초과하면 상기 촉매의 온도를 상승시키는 단계를 포함한다. One embodiment of the present invention, (a) comparing the output value of the front oxygen sensor installed in front of the vehicle catalyst and the rear oxygen sensor installed in the rear of the vehicle catalyst, and (b) the rear oxygen sensor of step (a) And increasing the temperature of the catalyst when the ratio of the value of the output value of the value divided by the output value of the front oxygen sensor exceeds a set value.

(b) 단계에서, 촉매의 온도 상승은, 차량의 점화시간을 일정 시간 지연시키는 것으로 이루어질 수 있다. In step (b), the temperature rise of the catalyst may consist of delaying the ignition time of the vehicle for a certain time.

차량의 점화시간은, 차량의 냉각수 온도의 하강에 비례하고, 후방 산소센서의 출력값을 전방 산소센서의 출력값으로 나눈 값의 비율의 크기에 비례하여 차량의 점화시간의 지연시간이 증대될 수 있다. The ignition time of the vehicle may be increased in proportion to the decrease in the temperature of the coolant of the vehicle, and the delay time of the ignition time of the vehicle may be increased in proportion to the ratio of the ratio of the output value of the rear oxygen sensor divided by the output value of the front oxygen sensor.

(b) 단계에서, 촉매의 온도 상승은, 차량의 rpm을 상승시키는 것으로 이루어질 수 있다. In step (b), the temperature rise of the catalyst may consist in raising the rpm of the vehicle.

차량의 rpm의 상승은, 차량의 냉각수 온도의 하강에 비례하고, 후방 산소센서의 출력값을 전방 산소센서의 출력값으로 나눈 값의 비율의 크기에 비례하여 차량의 rpm이 상승될 수 있다. The increase of the rpm of the vehicle may be increased in proportion to the decrease of the temperature of the cooling water of the vehicle and in proportion to the magnitude of the ratio of the output value of the rear oxygen sensor divided by the output value of the front oxygen sensor.

(b) 단계 이후에, (b-1) 촉매 온도를 상승시키는 시간이 설정 시간을 초과하는지 여부를 판단하는 단계와, (b-2) 상기 (b-1) 단계의 설정 시간을 초과하면 차량 엔진 시동을 실시하는 단계를 포함할 수 있다. after step (b), determining whether the time for raising the catalyst temperature (b-1) exceeds the set time; and (b-2) if the set time for step (b-1) exceeds the set time, Performing an engine start.

본 발명의 일 실시예에 따르면, 촉매의 열화 진행상태를 파악하여, 촉매 열화가 상당 부분 진행되었을 경우에만 촉매 히팅 작용을 실시함으로써, 불필요한 촉매 온도 상승을 위한 차량 작동을 실시하지 않게 되어 효율적인 차량 구동이 가능하다.According to one embodiment of the present invention, by identifying the progress of the catalyst deterioration, by performing the catalyst heating action only when the deterioration of the catalyst proceeds to a substantial portion, it is not efficient to drive the vehicle for unnecessary catalyst temperature rise This is possible.

도 1은 본 발명의 전방 산소센서와 후방 산소 센서의 설치된 상태를 개략적으로 도시한 도면이다.
도 2는 본 발명의 일 실시예에 따른 차량의 촉매 활성 시간 단축 방법을 개략적으로 도시한 흐름도이다.1 is a view schematically showing the installed state of the front oxygen sensor and the rear oxygen sensor of the present invention.
2 is a flowchart schematically illustrating a method for shortening catalyst activation time of a vehicle according to an exemplary embodiment of the present invention.

이하 본 발명의 실시예들에 따른 차량의 촉매 활성 시간 단축 방법을 첨부된 도면을 참조하여 상세히 설명한다. 그러나 본 발명은 이하에서 개시되는 실시예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이며, 단지 본 실시예는 본 발명의 개시가 완전하도록 하며, 통상의 지식을 가진자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다. Hereinafter, a method of shortening catalyst activation time of a vehicle according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know.

도 1은 본 발명의 전방 산소센서와 후방 산소 센서의 설치된 상태를 개략적으로 도시한 도면이다.1 is a view schematically showing the installed state of the front oxygen sensor and the rear oxygen sensor of the present invention.

도 1에 도시된 바와 같이, 전방 산소센서(10)는 촉매(20)의 전방에 설치되어 엔진(30)에서 배출되는 배기가스 중에 포함되어 있는 산소 농도를 검출하여 그에 따른 소정의 신호를 출력한다.As shown in FIG. 1, the front oxygen sensor 10 is installed in front of the catalyst 20 to detect an oxygen concentration contained in the exhaust gas discharged from the engine 30 and output a predetermined signal accordingly. .

그리고, 후방 산소센서(40)는 촉매(20)의 후방에 설치되어 촉매(20)에서 정화된 배기가스 중에 포함된 산소 농도를 검출하여 그에 따른 소정의 신호를 출력한다.In addition, the rear oxygen sensor 40 is installed at the rear of the catalyst 20 to detect the oxygen concentration contained in the exhaust gas purified by the catalyst 20 and output a predetermined signal accordingly.

전자제어장치(50)는 전방 산소센서(10)와 후방 산소센서(40)의 신호를 구간 적분하여 연산되는 촉매 열화지수에 따라 촉매의 정상 작동여부를 판단한다. 한편, 전자제어장치(50)는 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값의 비율이 설정값을 초과하는지 여부를 판단한다. 전자제어장치(50)는 후방 산소센서의 출력값을 전방 산소센서의 출력값으로 나눈 값의 비율이 설정값을 초과하면 촉매의 온도를 상승시킨다. 이는 촉매(20)의 활성화 시간을 단축시키기 위한 것으로서 이에 대해서는 이하에서 도 2를 참조하여 보다 구체적으로 설명한다. The electronic controller 50 determines whether the catalyst is normally operating according to the catalyst deterioration index calculated by integrating the signals of the front oxygen sensor 10 and the rear oxygen sensor 40. On the other hand, the electronic controller 50 determines whether the ratio of the value obtained by dividing the output value of the rear oxygen sensor 40 by the output value of the front oxygen sensor 10 exceeds the set value. The electronic controller 50 increases the temperature of the catalyst when the ratio of the value obtained by dividing the output value of the rear oxygen sensor by the output value of the front oxygen sensor exceeds the set value. This is to shorten the activation time of the catalyst 20, which will be described in more detail with reference to FIG. 2 below.

도 2는 본 발명의 일 실시예에 따른 차량의 촉매 활성 시간 단축 방법을 개략적으로 도시한 흐름도이다. 이하에서 도 2를 참조하여 차량의 촉매 활성 시간 단축 방법을 구체적으로 설명한다.2 is a flowchart schematically illustrating a method for shortening catalyst activation time of a vehicle according to an exemplary embodiment of the present invention. Hereinafter, a method of shortening catalyst activation time of a vehicle will be described in detail with reference to FIG. 2.

먼저, 차량에 설치된 전방 산소센서(10)와 후방 산소센서(40)의 출력값을 도출하여 비교한다.(S10) (S10) 단계에서 전방 산소센서(10) 및 후방 산소센서(40)에서 출력된 신호는 전자제어장치(50)로 전송된다.First, the output values of the front oxygen sensor 10 and the rear oxygen sensor 40 installed in the vehicle are derived and compared. In operation S10, the front oxygen sensor 10 and the rear oxygen sensor 40 are output. The signal is transmitted to the electronic controller 50.

다음, (S10) 단계에서 전방 산소센서(10) 및 후방 산소센서(40)에서 출력된 신호를 비교하여, 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값의 비율이 설정값을 초과하는지 여부를 판단한다.(S20)Next, by comparing the signals output from the front oxygen sensor 10 and the rear oxygen sensor 40 in step (S10), the ratio of the value of the output value of the rear oxygen sensor 40 divided by the output value of the front oxygen sensor 10 It is determined whether or not this set value is exceeded (S20).

이어서, (S20) 단계에서 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값(후방 산소센서 출력값/전방 산소센서 출력값=T1)이의 비율이 설정값을 초과하는 것으로 판단되면, 촉매(20)의 온도를 상승시킨다.(S30)Subsequently, it is determined that the ratio of the value obtained by dividing the output value of the rear oxygen sensor 40 by the output value of the front oxygen sensor 10 (rear oxygen sensor output value / front oxygen sensor output value = T1) in step S20 exceeds the set value. If so, the temperature of the catalyst 20 is increased.

여기서 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값의 비율이 설정값 이내일 경우는, 촉매(20)의 열화 상태가 일정값 이하인 상태로서 촉매(20)의 성능이 우수하여 촉매(20) 히팅(heating)이 필요 없는 상태를 말한다. If the ratio of the value obtained by dividing the output value of the rear oxygen sensor 40 by the output value of the front oxygen sensor 10 is within the set value, the deterioration state of the catalyst 20 is equal to or less than a predetermined value. This state is excellent and the catalyst 20 does not require heating.

그리고 (S20) 단계에서 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값의 비율이 설정값을 초과하는 것으로 판단되면, 촉매(20)의 열화 상태가 상당 부분 진행된 상태로 인식하여 촉매(20)의 온도를 상승시킨다.And if it is determined that the ratio of the value obtained by dividing the output value of the rear oxygen sensor 40 by the output value of the front oxygen sensor 10 in step (S20) exceeds the set value, the deterioration state of the catalyst 20 is in a substantial progression state. Recognize as to increase the temperature of the catalyst (20).

촉매(20)의 온도를 상승시키는 것은 배기가스의 온도를 상승시키는 것으로 가능하다. 배기가스의 온도 상승은 차량 엔진의 공회전 상태에서 엔진 rpm을 상승시키거나, 엔진 점화시기를 지연시키는 것에 의해 가능하다.Raising the temperature of the catalyst 20 is possible by raising the temperature of the exhaust gas. The temperature rise of the exhaust gas is possible by raising the engine rpm in the idle state of the vehicle engine or delaying the engine ignition timing.

차량의 점화시간을 지연시키는 정도는, 차량 냉각수의 온도 및 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값의 비율의 크기에 따라 설정된다. 즉, 차량 냉각수의 온도가 낮을수록, 차량 냉각수의 온도 및 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값 비율이 높을수록 엔진 점화시기를 더욱 지연시킨다. 여기서, 냉각수의 온도 및 차량 냉각수의 온도 및 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값 비율 조건에 따른 엔진 점화시기 지연 시간의 결정은, 연소 안정성 및 운전성을 고려하여 적절하게 설정될 수 있다.The degree of delaying the ignition time of the vehicle is set according to the magnitude of the temperature of the vehicle cooling water and the ratio of the value of the output value of the rear oxygen sensor 40 divided by the output value of the front oxygen sensor 10. That is, the lower the temperature of the vehicle coolant, the higher the ratio of the temperature of the vehicle coolant and the output value of the rear oxygen sensor 40 to the higher output value ratio of the front oxygen sensor 10 further delays the engine ignition timing. Here, the determination of the engine ignition timing delay time according to the temperature ratio of the coolant, the temperature of the vehicle coolant, and the output value of the rear oxygen sensor 40 according to the output value ratio condition of the front oxygen sensor 10 is appropriate in consideration of combustion stability and operability. Can be set.

그리고 엔진 rpm을 상승시키는 정도는 전술한 차량의 점화시간을 지연시간을 결정하는 방법과 동일한 방법 즉, 차량 냉각수의 온도가 낮을수록, 차량 냉각수의 온도 및 후방 산소센서(40)의 출력값을 전방 산소센서(10)의 출력값으로 나눈 값이 비율이 높을수록 엔진 rpm을 더욱 상승시킨다.The engine rpm is increased in the same manner as the above-described method of determining the ignition time of the vehicle, that is, the lower the temperature of the vehicle coolant, the lower the temperature of the vehicle coolant and the output value of the rear oxygen sensor 40. The higher the ratio divided by the output value of the sensor 10, the higher the engine rpm.

다음, (S30) 단계 이후에 촉매(20)의 온도를 상승시키는 시간이 설정 시간에 도달했는지 여부를 판단하여(S40), 설정시간에 도달하면 촉매(20)의 온도 상승 작동을 중단시킨다.(S50)Next, it is determined whether the time for raising the temperature of the catalyst 20 after the step (S30) has reached the set time (S40), and when the set time is reached, the temperature raising operation of the catalyst 20 is stopped. S50)

이어서, 전술한 각 단계들을 거쳐 결정된 엔진 rpm과 엔진 점화시기는 전자제어장치(50)에 입력된다.(S60) 전자제어장치(50)는 결정된 엔진 rpm 및 엔진 점화시기 데이터를 이용하여 연료량 및 공기량을 연산하여 이후의 엔진 시동에 적용한다.(S70)Subsequently, the engine rpm and the engine ignition timing determined through the above-described steps are input to the electronic controller 50 (S60). The electronic controller 50 uses the determined engine rpm and engine ignition timing data to determine the fuel amount and air amount. Calculate and apply to subsequent engine start. (S70)

이와 같이, 본 실시예의 차량의 촉매 활성 시간 단축 방법은 촉매(20)의 열화 진행상태를 파악하여, 촉매(20) 열화가 상당 부분 진행되었을 경우에 촉매(20) 히팅 작용을 실시한다. 따라서, 불필요한 촉매 온도 상승을 위한 차량 작동을 실시하지 않게 되어 효율적인 차량 구동이 가능하게 된다.As described above, the method for shortening the catalyst activation time of the vehicle of the present embodiment grasps the deterioration state of the catalyst 20, and performs the heating of the catalyst 20 when the catalyst 20 deteriorates. Therefore, the vehicle operation for unnecessary catalyst temperature rise is not performed, and efficient vehicle driving is possible.

이상, 본 발명을 도면에 도시된 실시예를 참조하여 설명하였다. 그러나, 본 발명은 이에 한정되지 않고 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 본 발명과 균등한 범위에 속하는 다양한 변형예 또는 다른 실시예가 가능하다.The present invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments falling within the scope of the present invention are possible by those skilled in the art.

10...전방 산소센서 20...촉매
30...엔진 40...후방 산소센서
50...전자제어장치10 ... front oxygen sensor 20 ... catalyst
30. Engine 40. Rear oxygen sensor
50.Electronic control device

Claims (6)

삭제delete 삭제delete 삭제delete 삭제delete 삭제delete (a) 차량 촉매의 전방에 설치된 전방 산소센서와 차량 촉매의 후방에 설치된 후방 산소센서의 출력값을 비교하는 단계; 및
(b) 상기 (a) 단계의 후방 산소센서의 출력값을 상기 전방 산소센서의 출력값으로 나눈 값의 비율이 설정값을 초과하면, 상기 촉매의 열화가 진행된 것으로 인식하여 촉매의 온도를 상승시키는 단계를 포함하며,
상기 전방 산소센서와 후방 산소센서의 신호를 구간 적분하여 연산되는 촉매 열화지수에 따라 촉매의 정상 작동 여부를 판단하고,
상기 촉매의 온도 상승은 촉매의 열화 상태에 도달 시에만 차량의 rpm을 상승시켜 배기가스의 온도를 상승시키는 것으로 가능하며,
상기 차량의 rpm의 상승은 차량의 냉각수 온도의 하강에 비례하고, 상기 후방 산소센서의 출력값을 상기 전방 산소센서의 출력값으로 나눈 값의 비율의 크기에 비례하여 차량의 rpm이 상승되고,
상기 (b) 단계 이후에,
(b-1) 상기 촉매 온도를 상승시키는 시간이 설정 시간을 초과하는지 여부를 판단하는 단계; 및
(b-2) 상기 (b-1) 단계의 설정 시간을 초과하면, 차량 엔진 시동을 실시하는 단계를 더 포함하는 것을 특징으로 하는 차량의 촉매 활성 시간 단축 방법.(a) comparing the output values of the front oxygen sensor installed at the front of the vehicle catalyst with the rear oxygen sensor installed at the rear of the vehicle catalyst; And
(b) if the ratio of the value obtained by dividing the output value of the rear oxygen sensor in step (a) by the output value of the front oxygen sensor exceeds a preset value, recognizing that the catalyst has deteriorated and increasing the temperature of the catalyst; Include,
It is determined whether the catalyst is operating normally according to the catalyst deterioration index calculated by integrating the signals of the front oxygen sensor and the rear oxygen sensor.
The temperature increase of the catalyst is possible by raising the rpm of the vehicle only when the deterioration state of the catalyst is reached, thereby increasing the temperature of the exhaust gas,
The increase of the rpm of the vehicle is proportional to the decrease of the temperature of the coolant of the vehicle, and the rpm of the vehicle is increased in proportion to the ratio of the ratio of the output value of the rear oxygen sensor divided by the output value of the front oxygen sensor.
After step (b),
(b-1) determining whether the time for raising the catalyst temperature exceeds a set time; And
(b-2) if the set time of step (b-1) is exceeded, starting the vehicle engine further comprising the step of reducing the catalyst activation time of the vehicle.
KR1020110089048A 2011-09-02 2011-09-02 Method for reducing catalyst time of vehicle KR101326817B1 (en)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
JPH0719032A (en) * 1993-06-22 1995-01-20 Hitachi Ltd Method and device for evaluating nox purifying catalyst and method for controlling nox purifying catalyst efficiency
JPH07208153A (en) * 1994-01-20 1995-08-08 Toyota Motor Corp Exhaust emission control device of internal combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0719032A (en) * 1993-06-22 1995-01-20 Hitachi Ltd Method and device for evaluating nox purifying catalyst and method for controlling nox purifying catalyst efficiency
JPH07208153A (en) * 1994-01-20 1995-08-08 Toyota Motor Corp Exhaust emission control device of internal combustion engine

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