KR20090112002A - The Estimation Method of Engine Status - Google Patents

The Estimation Method of Engine Status Download PDF

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KR20090112002A
KR20090112002A KR1020080037649A KR20080037649A KR20090112002A KR 20090112002 A KR20090112002 A KR 20090112002A KR 1020080037649 A KR1020080037649 A KR 1020080037649A KR 20080037649 A KR20080037649 A KR 20080037649A KR 20090112002 A KR20090112002 A KR 20090112002A
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South Korea
Prior art keywords
engine
state
torque
vehicle
flywheel
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KR1020080037649A
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Korean (ko)
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KR101164059B1 (en
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허진혁
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주식회사 만도
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

PURPOSE: An estimation method of engine state is provided to electronically control a vehicle by estimating the engine state. CONSTITUTION: An engine torque and friction torque are measured(400) and traction state accelerating a vehicle is estimated(430), if flywheel torque in which the measured engine torque and friction torque are deducted is over a specified range(420). If the flywheel torque is in the specified range(440), the state of the engine is estimated as a drag state decelerating the vehicle(450). If the flywheel torque is not under the specified range, the state of the engine is estimated as an acceleration or a free rolling state does not accelerate or decelerate(460).

Description

엔진 상태 추정 방법 {The Estimation Method of Engine Status}{The Estimation Method of Engine Status}

본 발명은 엔진 상태 추정 방법에 관한 것으로, 더욱 상세하게는 엔진토크 및 마찰토크를 이용하여 엔진의 상태를 추정하는 엔진 상태 추정 방법에 관한 것이다. The present invention relates to an engine state estimating method, and more particularly, to an engine state estimating method for estimating a state of an engine using engine torque and friction torque.

일반적으로 차량의 전자제어시스템은 차량의 슬립현상을 효율적으로 방지하여 강력하고 안정된 제동력을 얻기 위한 것으로, 제동 시 휠의 미끄러짐을 방지하는 안티록 브레이크 시스템(Anti-Lock Brake System;이하, ABS라 한다)과, 차량의 급발진 또는 급가속시 구동 휠의 슬립을 방지하는 트랙션 제어시스템(Traction Control System;이하, TCS라 한다)과, ABS와 TCS를 조합하여 브레이크 액압을 제어함으로써 차량의 주행상태를 안정적으로 유지시키는 차량 안정성 제어시스템(Electronic Stability Program;이하, ESP 시스템이라 한다) 등이 개시되어 있다.In general, the electronic control system of a vehicle is to obtain a strong and stable braking force by effectively preventing the slip phenomenon of the vehicle, an anti-lock brake system (hereinafter referred to as ABS) to prevent the slip of the wheel during braking. ), A traction control system (hereinafter referred to as TCS) that prevents slippage of the driving wheel during sudden start or acceleration of the vehicle, and ABS and TCS are combined to control the brake hydraulic pressure to stabilize the driving state of the vehicle. A vehicle stability control system (hereinafter referred to as an ESP system) and the like are disclosed.

ESP 시스템은 위험한 운전상황에서 차량 스스로 브레이크를 밟거나 엔진토크를 제어하여 위험으로부터 벗어나게 하는 장치로, ABS가 브레이크를 직접 밟아야 효과를 발휘하고 또 제동하는 과정에서만 효과를 발휘하는 장치라면, ESP 시스템은 운전자가 브레이크를 밟지 않아도 스스로 최적의 차량운전을 찾아주는 장치이다.ESP system is a device that brakes itself or controls engine torque to release from danger in dangerous driving situation. It is a device that finds the optimal vehicle driving by itself without the driver applying the brakes.

그러나, 이러한 전자제어시스템이 차량을 제어하는데 있어서 엔진의 상태 정보는 중요한 제어 요소로 작용하지만, 종래에는 엔진의 상태 정보를 추정하는 방법이 없어 전자제어시스템이 엔진의 상태에 따른 차량 제어를 할 수 없었다. However, although the state information of the engine acts as an important control element in controlling the vehicle by such an electronic control system, there is no method of estimating the state information of the engine in the related art, and thus the electronic control system can control the vehicle according to the state of the engine. There was no.

본 발명은 전술한 문제점을 해결하기 위한 본 발명 목적은 엔진토크및 마찰토크를 이용하여 엔진의 상태를 추정하는 엔진 상태 추정 방법을 제공함에 있다.The present invention for solving the above problems is to provide an engine state estimation method for estimating the state of the engine using the engine torque and friction torque.

전술한 목적을 달성하기 위한 본 발명의 엔진 상태 추정 방법은 엔진토크 및 마찰토크를 측정하고, 상기 측정된 엔진토크에서 마찰토크를 차감한 플라이휠 토크가 일정범위 이상이라면 엔진의 상태를 차량을 가속시키는 트랙션상태로 추정한다.The engine state estimation method of the present invention for achieving the above object is to measure the engine torque and friction torque, and if the flywheel torque subtracting the friction torque from the measured engine torque is more than a predetermined range to accelerate the vehicle to the state of the engine Estimate the traction state.

또한, 상기 플라이휠 토크가 상기 일정범위 이하라면, 상기 엔진의 상태를 차량을 감속시키는 드래그 상태로 추정한다.In addition, if the flywheel torque is less than the predetermined range, the state of the engine is estimated as a drag state to decelerate the vehicle.

또한, 상기 플라이휠 토크가 상기 일정범위 이하가 아니라면, 상기 엔진의 상태를 차량을 가속 또는 감속시키지 않는 프리롤링 상태로 추정한다.In addition, if the flywheel torque is not below the predetermined range, the state of the engine is estimated as a pre-rolling state that does not accelerate or decelerate the vehicle.

이상에서 상세히 설명한 바와 같이, 본 발명은 엔진의 상태 정보를 추정하여 차량의 전자제어를 할 수 있어, 차량 제어의 정확성을 향상시킨 효과가 있다.As described above in detail, the present invention can estimate the state information of the engine to perform the electronic control of the vehicle, thereby improving the accuracy of the vehicle control.

이하에서는 본 발명의 바람직한 실시예를 도면을 참조하여 상세하게 설명하도록 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 제 1 실시예는 오토 및 수동의 차량에서 모두 사용되는 엔진 상태의 추정을 위한 실시예이며, 제 2 실시예는 오토의 차량에서 사용되는 엔진 상태의 추정을 위한 실시예이다.The first embodiment of the present invention is an embodiment for estimating an engine state used in both an auto and a manual vehicle, and the second embodiment is an embodiment for estimating an engine state used in an Otto vehicle.

도 1 은 본 발명의 제 1 실시예에 따른 엔진 상태의 추정을 설명하기 위한 개념도이다. 도 1 에 도시된 바와 같이 본 발명은 엔진에 발생하는 토크를 측정하는 엔진토크측정수단(100), 차륜에 발생하는 마찰토크 측정수단(200), 엔진토크와 마찰토크를 이용하여 엔진의 상태를 추정하여 차량을 제어하는 전자제어유닛(ECU: Eletronic Control Unit)(300)을 포함한다.1 is a conceptual diagram for explaining an estimation of an engine state according to a first embodiment of the present invention. As shown in FIG. 1, the present invention uses an engine torque measuring means 100 for measuring torque generated in an engine, a friction torque measuring means 200 generated in a wheel, and an engine torque and friction torque. And an electronic control unit (ECU) 300 that estimates and controls the vehicle.

엔진토크측정수단(100)은 엔진의 실린더 내에 구비되어 압력을 측정하는 압력센서(130) 및 상기 압력센서의 신호를 입력받아 측정 신호를 엔진 토크 값으로 변환시키는 신호변환수단(160)으로 구성된다. 여기서, 압력센서(130)는 상기 실린더 내의 연소실을 점화시킬 수 있는 점화 플러그를 갖는 점화플러그형 압력센서가 이용되는 것이 바람직하다.Engine torque measuring means 100 is composed of a pressure sensor 130 is provided in the cylinder of the engine for measuring the pressure and the signal conversion means 160 for receiving the signal of the pressure sensor and converts the measured signal into the engine torque value . Here, the pressure sensor 130 is preferably used a spark plug-type pressure sensor having a spark plug that can ignite the combustion chamber in the cylinder.

마찰토크측정수단(200)은 각 차륜의 휠 실린더에 설치되어 휠 실린더의 실제 압력을 검출하는 압력센서(230), 각 차륜에 마련되어 차륜의 속도를 검출하기 위한 휠 속도센서(260), 상기 휠속도센서 및 압력센서에서 측정된 신호를 전송받아 노면과 타이어의 마찰력에 의하여 발생하는 마찰토크 값으로 변환시키는 신호변환수단(290)으로 구성된다. The friction torque measuring means 200 is installed on the wheel cylinder of each wheel to detect the actual pressure of the wheel cylinder 230, the wheel speed sensor 260 for detecting the speed of the wheel provided on each wheel, the wheel It is composed of a signal conversion means 290 for receiving the signals measured by the speed sensor and pressure sensor to convert the friction torque value generated by the friction between the road surface and the tire.

전자제어유닛(300)은 차량에 장착된 복수의 전자제어시스템 각각에 장착된다. 그리고, 전자제어유닛(300)에는 엔진의 3가지 상태가 설정되며, 이 중 첫째는 엔진이 차량을 가속시키는 트랙션(Traction)상태이며, 둘째는 엔진이 차량을 감속시키는 드래그상태이고, 마지막 셋째는 엔진이 차량을 가속 또는 감속시키지 않는 프리롤링(Free Rolling)상태로 설정된다. 전자제어유닛(300)은 이 엔진의 상태를 상기 엔진토크측정수단(100)에서 측정된 엔진토크 및 상기 마찰토크측정수단(200)에서 측정된 마찰토크를 이용하여 엔진의 상태를 추정한다. 즉, 엔진토크에서 마찰토크를 차감한 부분을 플라이휠 토크라 하며, 전자제어유닛(300)은 이 플라이휠 토크가 일정범위 이상의 양의 값을 가지면 트랙션 상태로 판단한다. 그리고 전자제어유닛(300)은 플라이휠 토크가 일정범위 이하의 음의 값을 가지면 드래그 상태, 상기 엔진토크와 마찰토크가 일정범위 내에서 평행을 이루어 상기 플라이휠 토크가 일정 범위 이내에 있으면 프리롤링 상태로 판단한다.The electronic control unit 300 is mounted to each of the plurality of electronic control systems mounted on the vehicle. In addition, three states of the engine are set in the electronic control unit 300, the first of which is a traction (Traction) state in which the engine accelerates the vehicle, the second is a drag state in which the engine decelerates the vehicle, and the third is The engine is set to a free rolling state that does not accelerate or decelerate the vehicle. The electronic control unit 300 estimates the state of the engine by using the engine torque measured by the engine torque measuring means 100 and the friction torque measured by the friction torque measuring means 200. In other words, the portion of the engine torque that subtracts the friction torque is referred to as a flywheel torque, and the electronic control unit 300 determines that the flywheel torque is in a traction state when the flywheel torque has a positive value over a predetermined range. And if the flywheel torque has a negative value of a predetermined range or less, the electronic control unit 300 determines that the drag state, the engine torque and the friction torque is in parallel within a predetermined range, and the pre-rolling state if the flywheel torque is within a predetermined range. do.

이하에서는 도 2 를 참조하여 본 발명의 일실시예에 따른 엔진의 상태 추정 방법을 설명하도록 한다.Hereinafter, a state estimation method of an engine according to an embodiment of the present invention will be described with reference to FIG. 2.

차량의 전자제어 시스템이 작동되면, 전자제어유닛(300)은 엔진토크측정수단(100)에서는 엔진토크를 입력받고, 마찰토크측정수단(200)에서는 마찰토크를 입력받는다(400).When the electronic control system of the vehicle is operated, the electronic control unit 300 receives the engine torque from the engine torque measuring means 100, and receives the friction torque from the friction torque measuring means 200 (400).

400단계에서 전자제어유닛(300)이 엔진토크 및 마찰토크를 입력받으면, 전자제어유닛(300)은 엔진의 상태를 추정하기 위하여 플라이휠 토크를 구하기 위하여 엔진토크에서 마찰토크를 차감한다(410).When the electronic control unit 300 receives the engine torque and the friction torque in operation 400, the electronic control unit 300 subtracts the friction torque from the engine torque to obtain the flywheel torque in order to estimate the state of the engine (410).

410 단계에 의하여 플라이휠 토크가 구해지면, 전자제어유닛(300)은 상기 플라이휠 토크가 기 설정된 일정범위이상인지 비교한다(420).When the flywheel torque is obtained by the step 410, the electronic control unit 300 compares whether the flywheel torque is a predetermined range or more (420).

420 단계의 비교결과 플라이휠 토크가 일정범위 이상이라면, 전자제어유닛(300)은 엔진의 상태를 차량을 가속시키는 트랙션 상태로 추정하고, 이에 해당하는 차량의 제어를 수행한다(430).When the flywheel torque is greater than or equal to a predetermined range in step 420, the electronic control unit 300 estimates the state of the engine as a traction state for accelerating the vehicle and performs control of the vehicle (430).

하지만, 420 단계의 비교결과 플라이휠 토크가 일정범위 이상이 아니라면, 전자제어유닛(300)은 플라이휠 토크가 일정범위 이하인지 비교한다(440).However, if the flywheel torque is not more than a predetermined range as a result of the comparison of step 420, the electronic control unit 300 compares whether the flywheel torque is less than the predetermined range (440).

440 단계의 비교결과 플라이휠 토크가 일정범위 이하라면, 전자제어유닛(300)은 엔진의 상태를 차량을 감속시키는 드래그 상태로 추정하고, 이에 해당하는 차량의 제어를 수행한다(450).If the flywheel torque is less than a predetermined range as a result of the comparison of step 440, the electronic control unit 300 estimates the state of the engine as a drag state for decelerating the vehicle, and performs control of the vehicle (450).

한편, 440 단계의 비교결과 플라이휠 토크가 일정범위 이하가 아니라면, 전자제어유닛(300)은 플라이휠 토크가 기 설정된 일정범위 이내에 있어 엔진이 차량을 가속 또는 감속시키지 않는 프리롤링 상태에 있다고 추정한다. 그리고, 전제제어유닛(300)은 엔진의 프리롤링 상태에 해당하는 차량의 제어를 수행한다(460).On the other hand, if the flywheel torque is not less than a predetermined range as a result of the comparison of step 440, the electronic control unit 300 estimates that the flywheel torque is in a pre-rolling state does not accelerate or decelerate the vehicle because the flywheel torque is within a predetermined predetermined range. Then, the precondition control unit 300 performs control of the vehicle corresponding to the pre-rolling state of the engine (460).

도 1 은 본 발명의 일실시예에 따른 엔진의 상태 추정을 설명하기 위한 개념도이다.1 is a conceptual diagram illustrating a state estimation of an engine according to an embodiment of the present invention.

도 2 는 본 발명의 일실시예에 따른 엔진의 상태 추정 방법을 도시한 흐름도이다.2 is a flowchart illustrating a method of estimating a state of an engine according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호 설명 *Explanation of symbols on the main parts of the drawings

100: 엔진토크 측정수단 200: 마찰토크 측정수단100: engine torque measuring means 200: friction torque measuring means

300: 전자제어 유닛300: electronic control unit

Claims (3)

엔진토크 및 마찰토크를 측정하고,Measure engine torque and friction torque, 상기 측정된 엔진토크에서 마찰토크를 차감한 플라이휠 토크가 일정범위 이상이라면 엔진의 상태를 차량을 가속시키는 트랙션상태로 추정하는 엔진 상태 추정 방법. An engine state estimation method for estimating a state of an engine as a traction state for accelerating a vehicle if the flywheel torque obtained by subtracting friction torque from the measured engine torque is a predetermined range or more. 제 1 항에 있어서,The method of claim 1, 상기 플라이휠 토크가 상기 일정범위 이하라면,If the flywheel torque is below the predetermined range, 상기 엔진의 상태를 차량을 감속시키는 드래그 상태로 추정하는 엔진 상태 추정방법. An engine state estimation method for estimating a state of the engine as a drag state for decelerating a vehicle. 제 2 항에 있어서,The method of claim 2, 상기 플라이휠 토크가 상기 일정범위 이하가 아니라면, If the flywheel torque is not below the predetermined range, 상기 엔진의 상태를 차량을 가속 또는 감속시키지 않는 프리롤링 상태로 추정하는 엔진 상태 추정 방법.An engine state estimation method for estimating a state of the engine as a pre-rolling state that does not accelerate or decelerate a vehicle.
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KR20160133998A (en) * 2015-05-14 2016-11-23 현대자동차주식회사 Apparatus and method for learning engine friction torque for vehicle

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JP3632366B2 (en) 1997-04-18 2005-03-23 日産自動車株式会社 Traction control device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160133998A (en) * 2015-05-14 2016-11-23 현대자동차주식회사 Apparatus and method for learning engine friction torque for vehicle

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