KR101745253B1 - 변속기클러치 과열 방지 방법 - Google Patents

변속기클러치 과열 방지 방법 Download PDF

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Publication number
KR101745253B1
KR101745253B1 KR1020160030343A KR20160030343A KR101745253B1 KR 101745253 B1 KR101745253 B1 KR 101745253B1 KR 1020160030343 A KR1020160030343 A KR 1020160030343A KR 20160030343 A KR20160030343 A KR 20160030343A KR 101745253 B1 KR101745253 B1 KR 101745253B1
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South Korea
Prior art keywords
engine
rpm
clutch
temperature
soc
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KR1020160030343A
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English (en)
Inventor
이창민
나승찬
정권채
송준걸
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현대자동차주식회사
기아자동차주식회사
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Priority to KR1020160030343A priority Critical patent/KR101745253B1/ko
Priority to US15/197,426 priority patent/US9796374B2/en
Application granted granted Critical
Publication of KR101745253B1 publication Critical patent/KR101745253B1/ko

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    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
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    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S903/00—Hybrid electric vehicles, HEVS
    • Y10S903/902—Prime movers comprising electrical and internal combustion motors
    • Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
    • Y10S903/904—Component specially adapted for hev
    • Y10S903/912—Drive line clutch
    • Y10S903/914—Actuated, e.g. engaged or disengaged by electrical, hydraulic or mechanical means
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S903/00—Hybrid electric vehicles, HEVS
    • Y10S903/902—Prime movers comprising electrical and internal combustion motors
    • Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
    • Y10S903/904—Component specially adapted for hev
    • Y10S903/915—Specific drive or transmission adapted for hev

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  • Automation & Control Theory (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
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  • Power Engineering (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

이 발명의 변속기클러치 과열 방지 방법은 제어부가 엔진클러치 체결이 요구될 경우, 엔진RPM과 설정RPM을 비교하는 RPM비교단계; RPM비교단계 수행결과, 엔진RPM이 설정RPM 미만일 경우, 제어부가 변속기클러치의 온도와 설정온도를 비교하는 온도비교단계; 및 온도비교단계 수행결과, 변속기클러치의 온도가 설정온도보다 높은 경우, 제어부가 엔진클러치는 해제, 변속기클러치는 체결하고, 엔진의 동력으로 HSG가 배터리를 충전하여 모터에 구동력을 제공하도록 제어하는 시리즈주행모드제어단계;를 포함할 수 있다.

Description

변속기클러치 과열 방지 방법 {OVERHEAT PREVENT METHOD FOR TRANSMISSION CLUTCH}
본 발명은 하이브리드 차량의 변속기클러치가 과열되어 주행이 불가해지는 것을 방지하기 위한 변속기클러치 과열 방지 방법에 관한 것이다.
자동차에 대한 연비향상의 요구와 강화된 배출가스에 대한 OBD 규제에 따라 하이브리드 자동차에 대한 관심이 급증하고 있다.
특히, TMED 방식의 하이브리드 자동차는 하나 이상의 모터와 엔진이 구비되고, 모터를 구동시키기 위한 고전압의 전원이 저장되는 배터리, 배터리의 직류 전압을 교류전압으로 변환시켜주는 인버터, 엔진의 동력을 구동축에 전달하기 위한 엔진과 모터 사이에 장착되는 엔진클러치로 구성된다.
TMED 방식의 하이브리드 자동차는 운전자의 가속페달과 브레이크 페달의 조작으로 판단되는 가감속 의지, 부하, 차속, 배터리의 충전상태(SOC) 등에 따라 엔진클러치를 결합하거나 해제하여 HEV모드와 EV모드의 주행을 제공한다.
일 예로, 하이브리드 자동차는 EV모드 주행 중, 배터리가 제한되는 상황이 발생하면 엔진의 동력을 얻는 HEV모드 주행을 실시하기 위해 엔진클러치를 결합하여야 한다.
그런데 엔진클러치를 결합하고 유지하기 위해서는 엔진이 아이들(idle)RPM을 유지하여야 한데, 등판주행과 같이 고부하 주행 상황일 경우에는 낮은 차속으로 차량이 주행되어, 엔진을 아이들RPM으로 유지하는 것이 불가능하다. 이때, 변속기클러치를 슬립시켜 엔진RPM과 엔진클러치의 락업 상태를 유지할 수 있다.
하지만, 연속된 고부하 주행으로 인해, 변속기클러치에 슬립이 지속적으로 발생하면 슬립으로 인한 열발생으로 변속기클러치에 소손이 발생할 수 있다.
이에 종래에는 변속기클러치의 소손을 방지하기 위해 변속기클러치를 해제하였는데 이는 운전자가 차량을 주행할 수 없도록 하여 차량의 주행성을 저하시킨다는 문제점이 있었다.
상기의 배경기술로서 설명된 사항들은 본 발명의 배경에 대한 이해 증진을 위한 것일 뿐, 이 기술분야에서 통상의 지식을 가진자에게 이미 알려진 종래기술에 해당함을 인정하는 것으로 받아들여져서는 안 될 것이다.
KR 10-2010-0109421 A
본 발명은 이러한 문제점을 해결하기 위하여 제안된 것으로, 엔진클러치의 체결이 요구될 경우 변속기클러치의 온도에 따라 HSG 시리즈주행모드를 실시함으로써 변속기클러치가 과열되는 것을 방지하기 위한 변속기클러치 과열 방지 방법을 제공하는데 그 목적이 있다.
상기의 목적을 달성하기 위한 본 발명에 따른 변속기클러치 과열 방지 방법은 제어부가 엔진클러치 체결이 요구될 경우, 엔진RPM과 설정RPM을 비교하는 RPM비교단계; 상기 RPM비교단계 수행결과, 상기 엔진RPM이 설정RPM 미만일 경우, 상기 제어부가 변속기클러치의 온도와 설정온도를 비교하는 온도비교단계; 및 상기 온도비교단계 수행결과, 상기 변속기클러치의 온도가 설정온도보다 높은 경우, 상기 제어부가 엔진클러치는 해제, 변속기클러치는 체결하고, 엔진의 동력으로 HSG가 배터리를 충전하여 모터에 구동력을 제공하도록 제어하는 시리즈주행모드제어단계;를 포함할 수 있다.
상기 RPM비교단계 수행결과, 상기 엔진RPM이 설정RPM 이상일 경우, 상기 제어부가 상기 엔진클러치를 체결하는 엔진클러치체결단계;를 더 포함할 수 있다.
상기 온도비교단계 수행결과, 상기 변속기클러치의 온도가 설정온도 이하일 경우, 상기 제어부가 엔진클러치를 체결하고 변속기클러치를 슬립제어하는 변속기클러치슬립제어단계;를 더 포함할 수 있다.
상기 RPM비교단계 수행 전, 상기 제어부가 배터리SOC와 설정SOC를 비교하는 SOC비교단계;를 더 포함하고, 상기 SOC비교단계 수행결과, 상기 배터리SOC가 설정SOC 미만일 경우, 상기 제어부는 엔진클러치 체결이 요구된다고 판단하여 상기 RPM비교단계를 실시하는 것을 특징으로 할 수 있다.
상기 SOC비교단계 수행결과, 상기 배터리SOC가 설정SOC 이상일 경우, 상기 제어부가 엔진클러치를 해제하는 엔진클러치해제단계;를 더 포함할 수 있다.
상기 시리즈주행모드제어단계 이후, 상기 제어부는 상기 SOC비교단계를 재실시하는 것을 특징으로 할 수 있다.
상술한 바와 같은 구조로 이루어진 변속기클러치 과열 방지 방법에 따르면 변속기클러치의 과열로 인해 차량이 주행 불가 상황에 도달하는 것을 방지함으로써 차량의 상품성을 개선할 수 있다.
또한, 변속기클러치가 과열로 인해 소손되는 것을 방지하여, 차량의 부품 강건성을 향상시키고, 수리비용을 저감할 수 있다.
도 1은 본 발명의 일 실시예에 따른 변속기클러치 과열 방지 방법을 도시한 순서도,
도 2는 본 발명의 시리즈주행모드제어단계 시, 차량의 동력전달을 도시한 도면,
도 3은 본 발명의 엔진클러치체결단계 시, 차량의 동력전달을 도시한 도면,
도 4는 본 발명의 변속기클러치슬립제어단계 시, 차량의 동력전달을 도시한 도면,
도 5는 본 발명의 엔진클러치해제단계 시, 차량의 동력전달을 도시한 도면이다.
이하에서는 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예에 따른 변속기클러치 과열 방지 방법에 대하여 살펴본다.
도 1은 본 발명의 일 실시예에 따른 변속기클러치 과열 방지 방법을 도시한 순서도이다. 도 1을 참조하면, 변속기클러치 과열 방지 방법은 제어부가 엔진클러치 체결이 요구될 경우, 엔진RPM과 설정RPM을 비교하는 RPM비교단계(S20); 상기 RPM비교단계(S20) 수행결과, 상기 엔진RPM이 설정RPM 미만일 경우, 상기 제어부가 변속기클러치의 온도와 설정온도를 비교하는 온도비교단계(S30); 및 상기 온도비교단계(S30) 수행결과, 상기 변속기클러치의 온도가 설정온도보다 높은 경우, 상기 제어부가 엔진클러치는 해제, 변속기클러치는 체결하고, 엔진의 동력으로 HSG가 배터리를 충전하여 모터에 구동력을 제공하도록 제어하는 시리즈주행모드제어단계(S40);를 포함할 수 있다.
즉, 제어부는 엔진클러치의 체결이 요구될 경우, 엔진RPM을 이용하여 하이브리드 차량이 고부하 주행 중인지를 판단하고, 변속기클러치의 온도에 기반하여 변속기클러치의 과열 정도를 판단한다.
차량이 고부하 주행 중이고, 변속기클러치가 과열이라고 판단되는 상태라면 상술한 바와 같이 제어부는 엔진클러치를 해제, 변속기클러치를 체결하고, HSG가 엔진의 동력으로 배터리를 충전하고 충전된 전력으로 구동축과 연결된 모터를 구동시키도록 제어한다. 이에 따라 엔진을 아이들RPM으로 유지하기 위해 변속기클러치를 슬립제어하지 않아도 되는바, 변속기클러치 슬립제어에 따른 과열현상을 방지할 수 있다.
여기서, 상기 설정RPM은 아이들(idle)RPM보다 높게 설정됨으로써 엔진클러치가 체결된 상태에서 엔진RPM이 아이들RPM 미만으로 저하되는 것을 방지할 수 있다.
또한, 상기 설정온도는 변속기클러치가 소손되거나 성능이 저하되는 시점의 온도로 설정될 수 있다. 하지만, 상술한 설정RPM과 설정온도는 차량에 따라 그 값이 가변설정되어야 하는 것인바, 특정 수치로 한정되어서는 안될 것이다.
구체적으로, 도 2는 본 발명의 시리즈주행모드제어단계(S40) 시 차량의 동력전달을 도시한 도면이다. 도 1 내지 도 2를 참조하면 시리즈주행모드제어단계(S40)시 제어부(미도시)는 엔진클러치(210)를 해제하고, HSG(240)가 엔진(200)의 동력으로 발전을 수행하고 발전된 전력을 이용하여 모터(220)로 구동력을 전달함으로써 엔진(200)의 동력이 모터(220)로 전달되도록 제어한다. 따라서, 엔진클러치(210)를 체결할 수 없는 차량의 고부하 주행 상황에서 발진성능은 떨어지지만 엔진(200)의 동력을 차륜에 전달하기 위해 HSG(240)를 통한 동력전달을 수행함으로써 변속기클러치(235)의 슬립없이 엔진동력을 차륜에 전달할 수 있다.
이때, 제어부는 변속기제어유닛(TCU:Transmission Control Unit), 엔진제어유닛(ECU:Engine Control Unit), 전자제어유닛 등의 상위제어기인 차량제어기(HCU:Hybrid Control Unit)일 수 있다. 즉, 제어부는 엔진제어유닛을 통해 엔진(200)의 구동과 엔진클러치(210)의 체결/해제를 제어하고, 전자제어유닛을 통해 HSG(240)의 발전 여부와 모터(220)의 구동을 제어하며, 변속기제어유닛을 통해 변속기(230)와 내부의 변속기클러치(235) 체결/해제를 제어할 수 있다.
한편, 본 기술은 상기 RPM비교단계(S20) 수행결과, 상기 엔진RPM이 설정RPM 이상일 경우, 상기 제어부가 상기 엔진클러치를 체결하는 엔진클러치체결단계(S60);를 더 포함할 수 있다. 즉, 제어부는 엔진RPM이 설정RPM 이상으로써, 아이들RPM 미만으로 저하되는 고부하 주행 상황이 아니라고 판단하여 엔진클러치(210)를 체결한다.
도 3은 본 발명의 엔진클러치체결단계 시, 차량의 동력전달을 도시한 도면이다. 도 3을 참조하면, 엔진클러치체결단계(S60) 시, 엔진클러치(210)를 체결함으로써 엔진(200)와 모터(220)의 동력이 변속기(230)를 거쳐 구동륜으로 직접적으로 전달되도록 제어한다. 이에 따라 엔진(200)과 모터(220)의 동력 손실을 최소화할 수 있다.
아울러 본 기술은 상기 온도비교단계(S30) 수행결과, 상기 변속기클러치의 온도가 설정온도 이하일 경우, 상기 제어부가 엔진클러치를 체결하고 변속기클러치를 슬립 제어하는 변속기클러치슬립제어단계(S50);를 더 포함할 수 있다. 즉, 제어부에서 변속기클러치가 과열되는 상황이 아니라고 판단할 경우에 엔진클러치를 체결하되, 엔진RPM 저하로 엔진 시동꺼짐이 발생하는 것을 방지하기 위해 변속기클러치를 슬립제어함으로써 엔진클러치의 락업상태를 유지할 수 있다.
도 4는 본 발명의 변속기클러치슬립제어단계 시, 차량의 동력전달을 도시한 도면이다. 도 4를 참조하면, 변속기클러치슬립제어단계(S50) 시, 제어부는 엔진클러치(210)를 체결하여 구동축에 엔진(200)을 직결시키되, 변속기클러치(235)를 슬립제어함으로써 엔진(200)RPM이 아이들RPM 미만으로 저하되는 것을 방지하여 엔진 시동 꺼짐을 막을 수 있다. 따라서, 운전자가 차량을 주행할 수 없는 상황을 막을 수 있다.
한편, 본 기술은 상기 RPM비교단계(S20) 수행 전, 상기 제어부가 배터리SOC와 설정SOC를 비교하는 SOC비교단계(S10);를 더 포함하고, 상기 SOC비교단계(S10) 수행결과, 상기 배터리SOC가 설정SOC 미만일 경우, 상기 제어부는 엔진클러치 체결이 요구된다고 판단하여 상기 RPM비교단계(S20)를 실시하는 것을 특징으로 할 수 있다.
즉, 하이브리드 차량은 배터리의 잔존용량(SOC)에 따라 EV모드 또는 HEV모드로 주행할 수 있는데, 배터리SOC가 설정SOC 미만이면 모터만으로 차량을 주행하는 것이 제한되는바, 엔진클러치를 체결하여 엔진의 동력을 구동축에 부가해주는 것이 바람직하다.
따라서, 모터를 구동하는 배터리의 SOC가 부족할 경우, 차량의 주행모드를 HEV모드로 전환함으로써 배터리가 방전되는 현상을 막아 차량 주행이 불가능한 상황을 대비할 수 있다.
만약, 상기 SOC비교단계(S10) 수행결과, 상기 배터리SOC가 설정SOC 이상일 경우, 상기 제어부가 엔진클러치를 해제하는 엔진클러치해제단계(S70)를 수행할 수 있다. 즉, 모터를 구동하는 배터리의 잔존용량(SOC)이 차량 주행에 충분한 경우라면 차량의 주행모드를 EV모드로 유지하기 위해 엔진클러치를 해제상태로 유지하는 것이 바람직하다. 따라서, 모터만으로 차량을 주행할 수 있어 엔진구동으로 인한 연료소모를 막아 연비를 개선할 수 있다.
아울러, 본 기술에서 상기 시리즈주행모드제어단계(S40) 이후, 상기 제어부는 상기 SOC비교단계(S10)를 재실시하는 것을 특징으로 할 수 있다.
만약, 하이브리드 차량을 HSG에 기반한 시리즈모드로 주행할 경우, 발진성능이 다른 주행모드보다 저하되기 때문에 모터의 배터리SOC, 엔진RPM, 변속기클러치의 온도를 다시 감지하도록 로직을 구현함으로써 차량이 최적의 주행모드를 실시할 수 있도록 마련하는 것이 바람직하다.
상술한 바와 같은 구조로 이루어진 변속기클러치 과열 방지 방법에 따르면 변속기클러치의 과열로 인해 차량이 주행 불가 상황에 도달하는 것을 방지함으로써 차량의 상품성을 개선할 수 있다.
또한, 변속기클러치가 과열로 인해 소손되는 것을 방지하여, 차량의 부품 강건성을 향상시키고, 수리비용을 저감할 수 있다.
본 발명은 특정한 실시예에 관련하여 도시하고 설명하였지만, 이하의 특허청구범위에 의해 제공되는 본 발명의 기술적 사상을 벗어나지 않는 한도 내에서, 본 발명이 다양하게 개량 및 변화될 수 있다는 것은 당 업계에서 통상의 지식을 가진 자에게 있어서 자명할 것이다.
S10: SOC비교단계
S20: RPM비교단계
S30: 온도비교단계
S40: 시리즈주행모드제어단계
S50: 변속기클러치슬립제어단계
S60: 엔진클러치체결단계
S70: 엔진클러치해제단계

Claims (6)

  1. 제어부가 엔진클러치 체결이 요구될 경우, 엔진RPM과 설정RPM을 비교하는 RPM비교단계;
    상기 RPM비교단계 수행결과, 상기 엔진RPM이 설정RPM 미만일 경우, 상기 제어부가 변속기클러치의 온도와 설정온도를 비교하는 온도비교단계; 및
    상기 온도비교단계 수행결과, 상기 변속기클러치의 온도가 설정온도보다 높은 경우, 상기 제어부가 엔진클러치는 해제, 변속기클러치는 체결하고, 엔진의 동력으로 HSG가 배터리를 충전하여 모터에 구동력을 제공하도록 제어하는 시리즈주행모드제어단계;를 포함하는 변속기클러치 과열 방지 방법.
  2. 청구항 1에 있어서,
    상기 RPM비교단계 수행결과, 상기 엔진RPM이 설정RPM 이상일 경우, 상기 제어부가 상기 엔진클러치를 체결하는 엔진클러치체결단계;를 더 포함하는 변속기클러치 과열 방지 방법.
  3. 청구항 1에 있어서,
    상기 온도비교단계 수행결과, 상기 변속기클러치의 온도가 설정온도 이하일 경우, 상기 제어부가 엔진클러치를 체결하고 변속기클러치를 슬립제어하는 변속기클러치슬립제어단계;를 더 포함하는 변속기클러치 과열 방지 방법.
  4. 청구항 1에 있어서,
    상기 RPM비교단계 수행 전, 상기 제어부가 배터리SOC와 설정SOC를 비교하는 SOC비교단계;를 더 포함하고,
    상기 SOC비교단계 수행결과, 상기 배터리SOC가 설정SOC 미만일 경우, 상기 제어부는 엔진클러치 체결이 요구된다고 판단하여 상기 RPM비교단계를 실시하는 것을 특징으로 하는 변속기클러치 과열 방지 방법.
  5. 청구항 4에 있어서,
    상기 SOC비교단계 수행결과, 상기 배터리SOC가 설정SOC 이상일 경우, 상기 제어부가 엔진클러치를 해제하는 엔진클러치해제단계;를 더 포함하는 변속기클러치 과열 방지 방법.
  6. 청구항 4에 있어서,
    상기 시리즈주행모드제어단계 이후,
    상기 제어부는 상기 SOC비교단계를 재실시하는 것을 특징으로 하는 변속기클러치 과열 방지 방법.
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