KR20160065663A - Controlling method for cylinder de-activation engine - Google Patents
Controlling method for cylinder de-activation engine Download PDFInfo
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- KR20160065663A KR20160065663A KR1020140169937A KR20140169937A KR20160065663A KR 20160065663 A KR20160065663 A KR 20160065663A KR 1020140169937 A KR1020140169937 A KR 1020140169937A KR 20140169937 A KR20140169937 A KR 20140169937A KR 20160065663 A KR20160065663 A KR 20160065663A
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
- F02D17/023—Cutting-out the inactive cylinders acting as compressor other than for pumping air into the exhaust system
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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
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
- F02D17/023—Cutting-out the inactive cylinders acting as compressor other than for pumping air into the exhaust system
- F02D17/026—Cutting-out the inactive cylinders acting as compressor other than for pumping air into the exhaust system delivering compressed fluid, e.g. air, reformed gas, to the active cylinders other than during starting
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- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
본 발명은 가변 실린더 엔진의 CDA모드의 전환 운전을 제어하는 기술에 관한 것이다.
The present invention relates to a technique for controlling a switching operation of a CDA mode of a variable cylinder engine.
가변 실린더 엔진 시스템은, 엔진 출력에 따라 실린더의 운영을 조절하는 것으로, 저부하 운전조건에서 밸브 휴지기구의 작동을 통해 실린더의 일부분을 휴지(Deactivation)시키고, 나머지 실린더의 부하 상승에 따른 엔진 효율 증대로 연비를 향상시키게 된다.
The variable cylinder engine system adjusts the operation of the cylinder according to the engine output, deactivating a part of the cylinder through the operation of the valve stopping mechanism under the low load operating condition, and increasing the engine efficiency Fuel efficiency is improved.
한편, 도 1을 참조하면, V8형 가솔린 엔진의 경우, CDA모드로 전환시 8기통에서 4기통으로 가변하여 운전하는 4기통 CDA모드가 일반적이다.Referring to FIG. 1, in the case of a V8 type gasoline engine, a four-cylinder CDA mode is generally used in which the engine is changed from an 8-cylinder to a 4-cylinder when operating in the CDA mode.
즉, 운전 중 엔진토크에 따라 8기통이 모두 작동하는 기본모드와, 4기통만이 작동하는 CDA모드로 전환되어 엔진을 운전하게 되는 것이다.
That is, according to the engine torque during the operation, the basic mode in which all the eight cylinders operate and the CDA mode in which only the four cylinders operate are switched to operate the engine.
그런데, 상기 종래 기술은 CDA모드로 진입하는 운전조건과, CDA모드를 해제하는 운전조건이 동일하게 설정되어 있어, 해당 운전조건을 포함하는 운전영역에서 주행시 CDA모드의 진입 및 해제 작용이 매우 빈번하게 발생하여 연비가 저하되는 문제가 있다.However, in the above-mentioned prior art, since the driving condition for entering the CDA mode and the driving condition for releasing the CDA mode are set to be the same, the entering and releasing actions of the CDA mode at the time of driving in the driving range including the driving condition are very frequently There is a problem that the fuel efficiency is lowered.
또한, V8형 엔진에서 CDA모드로 전환시 4기통으로 엔진이 운전됨으로써, CDA모드에 따른 연비 저감 효과가 떨어지는 문제도 있다.
Further, when the V8 type engine is switched to the CDA mode, the engine is operated with four cylinders, thereby reducing the fuel consumption reduction effect according to the CDA mode.
상기의 배경기술로서 설명된 사항들은 본 발명의 배경에 대한 이해 증진을 위한 것일 뿐, 이 기술분야에서 통상의 지식을 가진 자에게 이미 알려진 종래기술에 해당함을 인정하는 것으로 받아들여져서는 안 될 것이다.
It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.
본 발명은 전술한 바와 같은 종래의 문제점을 해결하기 위하여 안출한 것으로, CDA모드의 빈번한 모드 전환을 방지하여 연비를 향상시키도록 한 가변 실린더 엔진의 제어방법을 제공하는 데 있다.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems as described above, and it is an object of the present invention to provide a control method of a variable cylinder engine that prevents frequent mode switching in the CDA mode and improves fuel economy.
상기와 같은 목적을 달성하기 위한 본 발명의 구성은, 운전자에 의해 요구되는 엔진출력값을 입력받는 입력단계; 휴지실린더수의 감소를 위한 감소기준값과, 감소한 휴지실린더수의 증가를 위한 증가기준값을 히스테리시스구간을 두어 설정하고, 상기 엔진출력값이 감소기준값 또는 증가기준값에 도달시 CDA모드를 전환하여 제어하는 CDA제어단계;를 포함하는 것을 특징으로 할 수 있다.According to an aspect of the present invention, there is provided an engine control method comprising: inputting an engine output value required by a driver; A CDA control for setting a decrease reference value for reducing the number of idle cylinders and an increasing reference value for increasing the number of idle cylinders by setting a hysteresis interval and switching the CDA mode when the engine output value reaches the decreasing reference value or the increasing reference value The method comprising the steps of:
상기 CDA제어단계는, 휴지실린더수의 감소를 위한 감소기준값이 휴지실린더수의 증가를 위한 증가기준값보다 높게 설정되어 히스테리시스구간을 형성할 수 있다.The CDA control step may set the hysteresis period by setting the decrease reference value for the reduction of the number of the idle cylinders to be higher than the increase reference value for the increase of the number of the idle cylinders.
상기 CDA제어단계에서, CDA운전영역과, 비CDA운전영역 상호 간의 전환 진입을 위한 감소기준값 및 증가기준값을 동일하게 설정될 수 있다.In the CDA control step, the decrease reference value and the increase reference value for switching between the CDA operation region and the non-CDA operation region may be set to be the same.
상기 CDA제어단계에서는, 2개의 실린더가 짝을 이루어 휴지 및 작동되어 CDA모드가 전환될 수 있다.In the CDA control step, the two cylinders are paused and operated in a pair so that the CDA mode can be switched.
상기 CDA제어단계 이전에 차량의 주행상태를 반영하는 출력값이 CDA운전조건을 만족하는지 판단하는 판단단계;를 더 포함할 수 있다.And a determining step of determining whether the output value reflecting the running state of the vehicle before the CDA control step satisfies the CDA operating condition.
상기 엔진출력값은 엔진토크일 수 있다.
The engine output value may be an engine torque.
상기한 과제 해결수단을 통해 본 발명은, 휴지기통수가 감소되는 CDA모드의 감소기준값이, 휴지기통수가 증가되는 CDA모드의 증가기준값에 비해 더 크게 설정됨으로써, 주행 중 주로 사용되는 CDA모드의 운전영역을 확장시키고, 이에 빈번한 CDA모드의 전환을 방지하여 운전자가 느끼는 주행감을 개선하는 것은 물론, CDA적용에 따른 연비 개선 효과를 극대화하는 효과가 있다.
According to the present invention, the reduction reference value of the CDA mode in which the rest period is reduced is set to be larger than the increase reference value of the CDA mode in which the rest period is increased, The CDA mode is prevented from being switched frequently to improve the driver's sense of driving, and the effect of improving the fuel economy by applying the CDA is maximized.
도 1은 종래 기술에 의한 8기통 엔진에서 CDA모드 전환시의 휴지실린더 운전방식을 예시하여 나타낸 도면.
도 2는 본 발명에 의한 가변 실린더 엔진의 제어방법의 제어흐름을 설명하기 위한 도면.
도 3은 본 발명에 따라 히스테리시스구간을 두어 설정된 감소기준값 및 증가기준값의 예시와, 이를 이용한 CDA모드의 전환 작용을 설명하기 위한 도면.
도 4는 본 발명에 의한 가변 실린더 엔진에서 휴지실린더의 운전방식을 예시를 나타낸 도면.Brief Description of the Drawings Fig. 1 is a diagram illustrating a hibernation cylinder operation mode at the time of switching a CDA mode in an 8-cylinder engine according to the prior art.
2 is a view for explaining a control flow of a control method of a variable cylinder engine according to the present invention;
3 is a diagram illustrating an example of a decrease reference value and an increase reference value set by setting a hysteresis interval according to the present invention and a switching operation of the CDA mode using the hysteresis interval.
4 is a view showing an example of the operation mode of the idle cylinder in the variable cylinder engine according to the present invention.
본 발명의 바람직한 실시예를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 가변 실린더 엔진의 제어방법은, 입력단계(S10)와, CDA제어단계(S30)를 포함하여 구성된다.
The control method of the variable cylinder engine of the present invention comprises an input step (S10) and a CDA control step (S30).
도 2와 도 3을 참조하여, 본 발명을 구체적으로 살펴보면, 먼저 입력단계(S10)에서는, 운전자에 의해 요구되는 엔진출력값을 입력받는다.Referring to FIGS. 2 and 3, the present invention will be described in detail. First, in an input step S10, an engine output value required by a driver is input.
예컨대, 상기 엔진출력값은 엔진회전수, 차속, 가속페달 답입량 등의 운전조건에 따라 확보할 수 있는 엔진토크일 수 있다.
For example, the engine output value may be an engine torque that can be secured according to operating conditions such as engine speed, vehicle speed, and accelerator pedal depression amount.
그리고, 상기 CDA제어단계(S30) 이전에는 차량의 주행상태를 반영하는 출력값이 CDA운전조건을 만족하는지 판단하는 판단단계(S20)를 더 포함할 수 있다.In addition, before the CDA control step S30, a determination step S20 may be further performed to determine whether the output value reflecting the driving state of the vehicle meets the CDA driving condition.
예컨대, 상기 출력값은 엔진회전수, 차속, 가속페달 답입량, 오일 온도 등일 수 있으며, 상기 출력값이 CDA운전조건에 만족하는 경우, CDA운전영역에 진입하도록 제어할 수 있다.
For example, the output value may be an engine speed, a vehicle speed, an accelerator pedal depression amount, an oil temperature, and the like. If the output value satisfies the CDA operation condition, the output value may be controlled to enter the CDA operation region.
특히, 본 발명의 CDA제어단계(S30)에서는, 휴지실린더수의 감소를 위한 감소기준값과, 감소한 휴지실린더수의 증가를 위한 증가기준값을 히스테리시스구간을 두어 설정한다. 그리고, 상기 엔진출력값이 감소기준값 또는 증가기준값에 도달시 CDA모드를 전환하여 제어할 수 있다.In particular, in the CDA control step S30 of the present invention, a hysteresis interval is set between a decrease reference value for decreasing the number of idling cylinders and an increasing reference value for increasing the number of idling cylinders. When the engine output value reaches the decrease reference value or the increase reference value, the CDA mode can be switched and controlled.
구체적으로, 도 3에 도시된 바와 같이, 휴지실린더수의 감소를 위한 감소기준값이 휴지실린더수의 증가를 위한 증가기준값보다 높게 설정되어 히스테리시스구간을 형성할 수 있다.
Specifically, as shown in FIG. 3, the decreasing reference value for decreasing the number of resting cylinders is set higher than the increasing reference value for increasing the number of resting cylinders, so that the hysteresis period can be formed.
예컨대, V8 엔진을 탑재한 차량이 2기통 CDA모드로 주행 중, 운전자가 요구하는 엔진토크가 4기통 CDA모드의 진입토크값(감소기준값)에 도달하면, 4기통 CDA모드로 전환되어 엔진이 운전된다. For example, when a vehicle equipped with a V8 engine is traveling in a two-cylinder CDA mode and the engine torque requested by the driver reaches the entry torque value (reduction reference value) of the four-cylinder CDA mode, do.
이어서, 운전자가 요구하는 엔진토크가 상기 감소기준값보다 상대적으로 낮게 설정된 4기통 CDA모드의 해제토크값(2기통 CDA모드의 진입토크값)(증가기준값)에 도달하면, 2기통 CDA모드로 전환되어 엔진이 운전되는 것이다.Subsequently, when the engine torque requested by the driver reaches the release torque value (increase torque reference value) of the four-cylinder CDA mode set to be relatively lower than the decrease reference value (increase reference value), the mode is switched to the two-cylinder CDA mode The engine is running.
이는 4기통 CDA모드에서 6기통 CDA모드로 전환시와, 6기통 CDA모드에서 4기통 CDA모드로 전환시에도 동일하게 적용될 것이다.This will be the same when switching from the 4-cylinder CDA mode to the 6-cylinder CDA mode and when switching from the 6-cylinder CDA mode to the 4-cylinder CDA mode.
즉, 휴지기통수가 감소되는 CDA모드의 감소기준값이, 휴지기통수가 증가되는 CDA모드의 증가기준값에 비해 더 크게 설정됨으로써, 특히 주행 중 주로 사용되는 4기통 CDA모드 및 6기통 CDA모드의 해제 시간을 지연하여 해당 CDA모드의 운전영역을 확장시키고, 이에 빈번한 CDA모드의 전환을 방지하여 운전자가 느끼는 주행감을 개선하는 것은 물론, 특히 CDA적용에 따른 연비 개선 효과를 극대화하는 것이다.
That is, since the decrease reference value of the CDA mode in which the rest period is decreased is set to be larger than the increase reference value of the CDA mode in which the rest period is increased, the release period of the 4-cylinder CDA mode and the 6-cylinder CDA mode The operation range of the corresponding CDA mode is delayed to prevent the frequent conversion of the CDA mode, thereby improving the driver's feeling of driving, and maximizing the effect of improving fuel efficiency by applying the CDA.
한편, 본 발명은 상기 CDA제어단계(S30)에서, CDA운전영역과, 비CDA운전영역 상호 간의 전환 진입을 위한 감소기준값 및 증가기준값을 동일하게 설정할 수 있다.Meanwhile, in the CDA control step (S30), the decrease reference value and the increase reference value for switching between the CDA operation region and the non-CDA operation region may be set to be the same.
예컨대, V8 엔진을 탑재한 차량이 6기통 CDA운전모드로 주행 중, 운전자가 요구하는 엔진토크가 8기통 비CDA모드의 진입토크값(감소기준값)에 도달하면, 8기통 비CDA모드로 전환되어 엔진이 비CDA운전영역에서 운전된다. For example, when a vehicle equipped with a V8 engine is traveling in a six-cylinder CDA operation mode and the engine torque requested by the driver reaches an entry torque value (reduction reference value) of the eight-cylinder non-CDA mode, The engine is operated in the non-CDA operating region.
이어서, 운전자가 요구하는 엔진토크가 상기 감소기준값과 동일하게 설정된 8기통 비CDA운전모드의 해제토크값(6기통 CDA모드의 진입토크값)(증가기준값)에 도달하면, 6기통 CDA모드로 전환되어 엔진이 운전되는 것이다.Subsequently, when the engine torque requested by the driver reaches the release torque value (increase torque reference value) of the 8-cylinder non-CDA operation mode set to be equal to the decrease reference value (increase reference value), switching to the 6-cylinder CDA mode And the engine is operated.
이는, 8기통 비CDA모드에서 2기통 CDA모드로 전환시에도 동일하게 적용될 것이다.This will be the same when switching from an 8-cylinder non-CDA mode to a 2-cylinder CDA mode.
즉, 2기통 CDA 모드와 8기통 비CDA모드는 진입 및 해제를 위한 감소기준값 및 증가기준값의 토크를 동일하게 사용할 수 있다.That is, in the two-cylinder CDA mode and the eight-cylinder non-CDA mode, the torque of the decreasing reference value and the increasing reference value for entering and releasing can be used equally.
결국, 차량의 주행 중 주로 사용되는 CDA모드를 최대한 확장시켜 빈번한 CDA모드의 전환을 방지하게 되고, 이를 통해 연비를 개선하게 되는 것이다.
As a result, the CDA mode, which is mainly used during driving of the vehicle, is maximally expanded to prevent the frequent switching of the CDA mode, thereby improving fuel economy.
그리고, 도 4를 참조하면, 본 발명의 CDA제어단계(S30)에서는, 2개의 실린더가 짝을 이루어 휴지 및 작동되어 CDA모드가 전환될 수 있다.And, referring to FIG. 4, in the CDA control step S30 of the present invention, two cylinders are paused and operated in pairs, so that the CDA mode can be switched.
예컨대, V8 엔진이 탑재된 차량의 경우, CDA운전영역에서 8기통, 6기통, 4기통, 2기통으로 CDA모드가 다분화됨으로써, 연비 개선 효과를 극대화하는 것이다.For example, in the case of a vehicle equipped with a V8 engine, the CDA mode is divided into 8 cylinders, 6 cylinders, 4 cylinders and 2 cylinders in the CDA operation region, thereby maximizing the fuel efficiency improvement effect.
다만, CDA모드가 다분화된만큼 각 CDA모드의 스위칭 구간에 연비 손실이 발생할 수 있는바, 본 발명에서는 상기와 같이 주행 중 주로 사용되는 CDA모드의 진입 및 해제토크 간에 히스테리시스구간을 두어 해당 CDA모드의 유지구간을 확장하게 되는바, CDA모드의 스위칭을 최소화하여 연비 개선에 도움을 주는 것이다.
However, since the CDA mode is differentiated, a fuel consumption loss may occur in the switching period of each CDA mode. In the present invention, a hysteresis period is provided between the entering and releasing torques of the CDA mode, So that the switching of the CDA mode can be minimized to help improve the fuel efficiency.
한편, 본 발명은 상기한 구체적인 예에 대해서만 상세히 설명되었지만 본 발명의 기술사상 범위 내에서 다양한 변형 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속함은 당연한 것이다.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the specific embodiments set forth herein; rather, .
S10 : 입력단계
S20 : 판단단계
S30 : CDA제어단계S10: Input step S20: Judgment step
S30: CDA control step
Claims (6)
휴지실린더수의 감소를 위한 감소기준값과, 감소한 휴지실린더수의 증가를 위한 증가기준값을 히스테리시스구간을 두어 설정하고, 상기 엔진출력값이 감소기준값 또는 증가기준값에 도달시 CDA모드를 전환하여 제어하는 CDA제어단계;를 포함하는 가변 실린더 엔진의 제어방법.An input step of receiving an engine output value required by a driver;
A CDA control for setting a decrease reference value for reducing the number of idle cylinders and an increasing reference value for increasing the number of idle cylinders by setting a hysteresis interval and switching the CDA mode when the engine output value reaches the decreasing reference value or the increasing reference value And a control step of controlling the variable cylinder engine.
상기 CDA제어단계는, 휴지실린더수의 감소를 위한 감소기준값이 휴지실린더수의 증가를 위한 증가기준값보다 높게 설정되어 히스테리시스구간을 형성하는 것을 특징으로 하는 가변 실린더 엔진의 제어방법.The method according to claim 1,
Wherein the CDA control step sets the decreasing reference value for reducing the number of resting cylinders to be higher than the increasing reference value for increasing the number of resting cylinders to form the hysteresis period.
상기 CDA제어단계에서, CDA운전영역과, 비CDA운전영역 상호 간의 전환 진입을 위한 감소기준값 및 증가기준값을 동일하게 설정된 것을 특징으로 하는 가변 실린더 엔진의 제어방법.The method according to claim 1,
Wherein in the CDA control step, a decrease reference value and an increase reference value for switching entry between the CDA operation region and the non-CDA operation region are set to be the same.
상기 CDA제어단계에서는, 2개의 실린더가 짝을 이루어 휴지 및 작동되어 CDA모드가 전환되는 것을 특징으로 하는 가변 실린더 엔진의 제어방법.The method according to claim 1,
Wherein in the CDA control step, the two cylinders are paused and operated in pairs to switch the CDA mode.
상기 CDA제어단계 이전에 차량의 주행상태를 반영하는 출력값이 CDA운전조건을 만족하는지 판단하는 판단단계;를 더 포함하는 것을 특징으로 하는 가변 실린더 엔진의 제어방법.The method according to claim 1,
Further comprising a determining step of determining whether the output value reflecting the running state of the vehicle satisfies the CDA operating condition before the CDA control step.
상기 엔진출력값은 엔진토크인 것을 특징으로 하는 가변 실린더 엔진의 제어방법.The method according to claim 1,
Wherein the engine output value is an engine torque.
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