KR100213736B1 - Method for control of heater at oxygen sensor of a vehicle - Google Patents
Method for control of heater at oxygen sensor of a vehicle Download PDFInfo
- Publication number
- KR100213736B1 KR100213736B1 KR1019960039808A KR19960039808A KR100213736B1 KR 100213736 B1 KR100213736 B1 KR 100213736B1 KR 1019960039808 A KR1019960039808 A KR 1019960039808A KR 19960039808 A KR19960039808 A KR 19960039808A KR 100213736 B1 KR100213736 B1 KR 100213736B1
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- Prior art keywords
- oxygen sensor
- heater
- speed
- determination
- comparing
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1494—Control of sensor heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
본 발명은 차량용 산소센서 히터 제어방법에 관한 것으로, 엔진의 냉각수 온도, 회전수, 차속을 판정 기준치와 비교하여 상기 조건을 만족할 시 산소(O2) 센서의 히터 가열을 중지케 함으로써 산소센서 및 산소센서의 히터 파손을 방지하도록 하는 것이다. 이와 같은 본 발명은 이그니션키를 온시켜 산소센서 히터를 동작시키는 단계와, 냉각수온도와 판정 냉각수온도를 비교하는 단계와, 상기 단계에서 냉각수 온도가 판정 냉각수온도보다 적을 경우 차속과 판정차속을 비교하는 단계와, 상기 단계에서 차속이 판정차속보다 클 경우 엔진회전수와 판정회전수를 비교하는 단계와, 상기 단계에서 엔진회전수가 판정 회전수보다 높을 경우 상기 전체 단계의 확인시간과 판정 경과시간을 비교하는 단계와, 상기 단계에서 전체단계의 확인시간이 판정 경과시간보다 길 경우에는 산소센서의 히터를 오프시키는 단계로 이루어짐을 특징으로 한다.The present invention relates to a heater control method for an oxygen sensor for a vehicle. The oxygen sensor and the oxygen are stopped by stopping the heater heating of the oxygen (O 2 ) sensor when the cooling water temperature, the rotational speed, and the vehicle speed of the engine are compared with a determination reference value and the above conditions are satisfied. This is to prevent damage to the heater of the sensor. The present invention is to operate the oxygen sensor heater by turning on the ignition key, comparing the coolant temperature and the determination coolant temperature, and comparing the vehicle speed and the determination vehicle speed when the coolant temperature is less than the determination coolant temperature in the step Comparing the engine speed and the judgment speed when the vehicle speed is greater than the judgment speed in the step; and comparing the checking time and the judgment elapsed time of the entire step when the engine speed is higher than the judgment speed in the step. And the step of turning off the heater of the oxygen sensor when the checking time of the whole step is longer than the determination elapsed time.
Description
본 발명은 차량용 산소센서 히터 제어방법에 관한 것으로, 더욱 상세하게 설명하면, 엔진의 냉각수 온도, 회전수, 차속을 판정 기준치와 비교하여 상기 조건을 만족할 시 산소(O2) 센서의 히터 가열을 중지케 함으로써 산소센서 및 산소센서의 히터 파손을 방지하도록 하는 것이다.The present invention relates to a vehicle oxygen sensor heater control method, and in more detail, the heater heating of the oxygen (O 2 ) sensor is stopped when the above condition is satisfied by comparing the coolant temperature, the rotation speed, and the vehicle speed of the engine with a determination reference value. This is to prevent the heater damage of the oxygen sensor and the oxygen sensor.
차량용 산소센서는 배기가스중 산소를 검출하는 센서로서, 공연비가 이론 공연비보다 농후한 상태를 조사하도록 하는 것으로, 구체적으로는 배기가스 중의 산소와 대기중의 산소 농도차에 따라 산소 이론 공연비를 중심으로 출력전압이 급격히 변화되는 것을 이용하여 피드백 조정(feed back control)의 기준 신호를 공급해 주는 역할을 하게 된다.The vehicle oxygen sensor is a sensor that detects oxygen in exhaust gas, and the air-fuel ratio is investigated to be richer than the theoretical air-fuel ratio. By rapidly changing the output voltage serves to supply a reference signal of the feedback control (feed back control).
도 1은 종래 산소센서의 히터 설치상태를 보인것으로, 엔진 콘트롤 유니트(ECU)내의 트랜지스터(TR)의 베이스단에 산소센서의 히터 콘트롤 신호를 인가하여 트랜지스터(TR)가 도통될시 산소센서 히터(H)가 가열되도록 구성하고 있으며, 이그니션 온시 항상 산소센서 히터(H)가 동작되도록 설계되어 있다.1 is a view illustrating a heater installation state of a conventional oxygen sensor. When a transistor TR is conducted by applying a heater control signal of an oxygen sensor to a base end of a transistor TR in an engine control unit ECU, the oxygen sensor heater ( H) is configured to be heated, and the oxygen sensor heater (H) is always operated at the time of ignition.
이와같이 작동되는 산소센서 히터(H)의 기능은 엔진이 냉각되어 있을때 산소센서를 조기에 활성화시켜 피드백을 앞당기도록 하는데 있다.The function of the oxygen sensor heater (H) operated in this way is to activate the oxygen sensor early when the engine is cooled to speed up the feedback.
그러나, 엔진이 과열된 상태일때, 산소센서 히터(H)가 과열될 경우 그 과열로 인해 산소센서 및 산소센서 히터(H)가 파손될 염려가 있고, 따라서 삼원촉매의 배기가스 정화 능력이 크게 저하될 뿐 아니라 산소센서를 교환해야 하는 경제적 손실이 지적된다.However, when the engine is overheated, if the oxygen sensor heater H is overheated, the oxygen sensor and the oxygen sensor heater H may be damaged due to the overheating, and thus the exhaust gas purification capability of the three-way catalyst may be greatly reduced. In addition, the economic loss of replacing the oxygen sensor is pointed out.
본 발명은 상기 종래 산소센서의 히터가 가지는 문제점을 해소하기 위하여 창출한 것으로, 특정조건 성립시 산소센서의 히터의 히팅을 중지토록 함으로써 산소센서와 산소센서의 히터 파손을 방지하고 배기가스의 상승 원인을 제거토록 하는 차량용 산소센서 히터 제어방법을 제공하는 것을 목적으로 하는 것이다.The present invention was created in order to solve the problem of the heater of the conventional oxygen sensor, by stopping the heating of the heater of the oxygen sensor when a specific condition is established to prevent damage to the heater of the oxygen sensor and oxygen sensor and cause the rise of exhaust gas It is an object of the present invention to provide a control method for a vehicle oxygen sensor heater to remove the.
상기한 과제를 달성하기 위한 본 발명은 이그니션키를 온시켜 산소센서 히터를 동작시키는 단계와, 냉각수온도와 판정 냉각수온도를 비교하는 단계와, 상기 단계에서 냉각수온도가 판정 냉각수온도보다 적을 경우 차속과 판정차속을 비교하는 단계와, 상기 단계에서 차속이 판정차속보다 클 경우 엔진회전수와 판정회전수를 비교하는 단계와, 상기 단계에서 엔진회전수가 판정 회전수보다 높을 경우 상기 전체 단계의 확인시간과 판정 경과시간을 비교하는 단계와, 상기 단계에서 전체단계의 확인시간이 판정 경과시간보다 길 경우에는 산소센서의 히터를 오프시키는 단계로 이루어짐을 특징으로 한다.The present invention for achieving the above object is to operate the oxygen sensor heater by turning on the ignition key, comparing the coolant temperature and the determined coolant temperature, and wherein the coolant temperature and the vehicle speed and Comparing the determination vehicle speed, comparing the engine speed and the determination speed when the vehicle speed is larger than the determination vehicle speed in the step; and when the engine speed is higher than the determination speed in the step, Comparing the determination elapsed time, and if the confirmation time of the entire step is longer than the determination elapsed time in the step is characterized in that the step of turning off the heater of the oxygen sensor.
도 1은 종래 산소센서 히터를 설명하기 위한 설치 상태도.1 is an installation state diagram for explaining a conventional oxygen sensor heater.
도 2는 본 발명을 설명하기 위한 플로우 챠트.2 is a flow chart for explaining the present invention.
※ 도면중 주요부분에 대한 부호설명※ Explanation of Codes on Major Parts of Drawings
ECU : 엔진콘트롤 유니트 TR : 트랜지스터ECU: Engine Control Unit TR: Transistor
H : 산소센서의 히터H: Heater of oxygen sensor
이와 같은 본 발명을 도 2의 플로우챠트에 의하여 구체적으로 설명하면 다음과 같다.The present invention will be described in detail with reference to the flowchart of FIG. 2 as follows.
이그니션키를 온시키는 단계(S1)에서는 산소센서의 히터가 자동적으로 온되어 가열된다.In the step S 1 of turning on the ignition key, the heater of the oxygen sensor is automatically turned on and heated.
이때, 엔진의 냉각수 온도를 판정(기준치) 냉각수 온도(예: 10℃)와 비교하는 단계(S2)를 거치게 한다.At this time, the step (S 2 ) of comparing the cooling water temperature of the engine with the determination (reference value) cooling water temperature (eg, 10 ° C.).
상기 단계(S2)에서 엔진의 냉각수 온도가 판정 냉각수 온도와 비교하여 10℃보다 적을 경우에는 차속과 판정차속(예: 100KPH)을 비교하게 하고 (단계 S3), 상기 단계(S3)에서 차속이 판정차속보다 높을 경우에는 엔진 회전수와 판정회전수(예: 5000rpm)와 비교하는 단계(S4)를 거치게 한다.When the coolant temperature of the engine in the step (S 2 ) is less than 10 ° C compared to the determination coolant temperature to compare the vehicle speed and the determination vehicle speed (for example 100KPH) (step S 3 ), in the step (S 3 ) When the vehicle speed is higher than the determination vehicle speed, the step S 4 of comparing the engine speed with the determination rotation speed (eg, 5000 rpm) is performed.
상기 단계(S4)에서, 엔진 회전수가 판정회전수보다 높을 경우에는 상기 단계(S1∼S4) 전체 확인시간과 판정경과 시간(예: 2sec)을 비교하여 (단계 S5), 상기 전체 확인시간이 판정경과 시간보다 길 경우에는 산소센서 히터를 오프시키도록 한다(단계 S6).In the step S 4 , when the engine speed is higher than the determination speed, the entire checking time of the steps S 1 to S 4 is compared with the determination elapsed time (eg, 2 sec) (step S 5 ), and the whole If the confirmation time is longer than the determination elapsed time, the oxygen sensor heater is turned off (step S 6 ).
이와 같은 본 발명은 엔진 냉각수온은 낮으나 고속으로 주행하여 엔진 회전수가 높을 경우 산소센서의 히터를 가열할 필요가 없으므로 이때에는 산소센서의 히터 작동을 중지시키므로써 산소센서 및 산소센서의 히터의 파손을 방지할 수 있게 되는 것이다.The present invention does not need to heat the heater of the oxygen sensor when the engine coolant temperature is low but the engine speed is high by running at high speed, at this time by stopping the heater operation of the oxygen sensor to prevent damage to the heater of the oxygen sensor and oxygen sensor It can be prevented.
이상과 같이 본 발명은 차속과 엔진 회전수가 기준 차속과 회전수 보다 높고 냉각수온은 낮은 조건하에서는 산소센서를 활성화하기 위한 피드백을 실행할 필요성이 없으므로 상기 조건이 성립될시 산소센서의 히터의 동작을 중지케 함으로써 산소센서 및 산소센서의 히터 파손을 미연에 방지하여 산소센서 등 부품의 교환에 따른 경제적 손실을 배제하고, 산소센서 등의 고장으로 인한 배기가스의 상승요인을 제거할 수 있게 되는 특징이 있다.As described above, the present invention does not need to execute the feedback for activating the oxygen sensor under the condition that the vehicle speed and the engine speed are higher than the reference vehicle speed and the rotation speed and the cooling water temperature is low. By preventing the damage to the heater of the oxygen sensor and the oxygen sensor in advance, it is possible to eliminate the economic loss due to the replacement of parts such as the oxygen sensor, and to remove the rise factor of the exhaust gas due to the failure of the oxygen sensor. .
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960039808A KR100213736B1 (en) | 1996-09-13 | 1996-09-13 | Method for control of heater at oxygen sensor of a vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960039808A KR100213736B1 (en) | 1996-09-13 | 1996-09-13 | Method for control of heater at oxygen sensor of a vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR19980021068A KR19980021068A (en) | 1998-06-25 |
| KR100213736B1 true KR100213736B1 (en) | 1999-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019960039808A KR100213736B1 (en) | 1996-09-13 | 1996-09-13 | Method for control of heater at oxygen sensor of a vehicle |
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| KR (1) | KR100213736B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100412693B1 (en) * | 2001-10-08 | 2003-12-31 | 현대자동차주식회사 | Method of controlling o2 sensor heater for vehicles |
| KR100427328B1 (en) * | 2001-12-20 | 2004-04-14 | 현대자동차주식회사 | Method of controlling heating for oxygen sensor in a vehicles |
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1996
- 1996-09-13 KR KR1019960039808A patent/KR100213736B1/en not_active IP Right Cessation
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| Publication number | Publication date |
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| KR19980021068A (en) | 1998-06-25 |
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