KR20100062635A - Method of controlling an electric oil pump of a hybrid car - Google Patents
Method of controlling an electric oil pump of a hybrid car Download PDFInfo
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Abstract
이 발명은 기계식 오일펌프와 전동식 오일펌프를 구비한 자동변속기를 장착한 하이브리드 자동차에서, 변속기 요구유압과 기계식 오일펌프의 출력유압과의 차이를 보상하는 정도로만 전동식 오일펌프를 제어하는 방법에 관한 것이다.The present invention relates to a method for controlling an electric oil pump only in a hybrid vehicle equipped with an automatic transmission having a mechanical oil pump and an electric oil pump to compensate for the difference between the required hydraulic pressure and the output oil pressure of the mechanical oil pump.
이 발명의 전동식 오일펌프 제어방법은, 엔진토크와 모터토크와 오일온도의 정보가 입력되면 변속기 요구유압 및 최소 목표 회전속도를 계산하는 제1단계와, 현재 변속기의 회전속도와 회전감가속도를 계산하는 제2단계와, 상기 변속기의 최소 목표 회전속도와 상기 현재 변속기의 회전속도와 회전감가속도를 이용하여 상기 변속기 요구유압 대비 현재 유압이 미달되는지를 판단하는 제3단계와, 상기 제3단계의 판단결과에 따라 전동식 오일펌프의 온/오프 및 구동속도를 결정하는 제4단계를 포함한다.The electric oil pump control method of the present invention comprises the first step of calculating the required hydraulic pressure and the minimum target rotational speed when the information of the engine torque, the motor torque and the oil temperature is input, and calculating the rotational speed and the rotational deceleration of the current transmission. And a third step of determining whether the current hydraulic pressure is less than the required hydraulic pressure by using the minimum target rotational speed of the transmission, the rotational speed and the rotational deceleration of the current transmission, and the third step. And a fourth step of determining on / off and driving speed of the electric oil pump according to the determination result.
Description
이 발명은 자동변속기를 장착한 하이브리드 자동차에 관한 것으로서, 보다 상세하게는 기계식 오일펌프와 전동식 오일펌프를 구비한 자동변속기에서 요구유압과 기계식 오일펌프의 출력유압과의 차이를 보상하는 정도로만 전동식 오일펌프를 제어하는 방법에 관한 것이다.The present invention relates to a hybrid vehicle equipped with an automatic transmission, and more particularly, an electric oil pump only to compensate for the difference between the required oil pressure and the output oil pressure of the mechanical oil pump in an automatic transmission having a mechanical oil pump and an electric oil pump. It relates to a method of controlling.
통상적으로 하이브리드 자동차는 엔진과 배터리의 전원으로 구동되는 구동모터로 구성되는 동력원이 구비되며, 전륜에 상기의 동력원을 적절히 조합한 구조를 적용하여 차량의 출발시나 가속시에 배터리의 전압에 의해 동작되는 모터의 동력 보조로 연비 향상을 유도할 수 있는 차량을 말한다.In general, a hybrid vehicle is provided with a power source consisting of a drive motor driven by an engine and a battery power source, and is operated by the voltage of the battery at the start or acceleration of the vehicle by applying a structure in which the power source is properly combined with the front wheels. It is a vehicle that can induce fuel efficiency improvement by power assistance of the motor.
자동변속기를 장착한 하이브리드 자동차는 스탑앤고(stop and go) 등의 주행 중 엔진이 정지하는 경우를 대비하여야 한다. 이를 위해 자동변속기에 오일을 공급하기 수단으로서, 기존의 기계식 오일펌프 외에 전동식 오일펌프를 기계식 오일펌프와 병렬로 추가 장착하고 있다.Hybrid cars equipped with automatic transmissions should be prepared in case the engine stops during driving such as stop and go. To this end, as a means of supplying oil to the automatic transmission, in addition to the existing mechanical oil pump, an electric oil pump is additionally installed in parallel with the mechanical oil pump.
도 1은 일반적인 하이브리드 자동차의 자동변속기의 오일 공급시스템을 도시한 도면이다.1 is a view illustrating an oil supply system of an automatic transmission of a general hybrid vehicle.
오일팬(11)이 가동하면 오일필터(12)를 거쳐 필터링된 오일이 기계식 오일펌프(13)에서 자동변속기(미도시)에 공급된다. 이 기계식 오일펌프(13)는 엔진의 힘에 의해 가동되기 때문에 주행 중 엔진이 정지하는 경우에는 자동변속기에 적절한 유압을 제공하지 못하게 된다.When the
따라서, 하이브리드 자동차의 자동변속기에는 기계식 오일펌프와 병렬로 전동식 오일펌프(14)를 추가하고, 이 전동식 오일펌프(14)를 모터(15)를 이용하여 동작시킨다.Therefore, the
이러한 구조에서는 두 펌프 중 어느 하나면 동작하여도 자동변속기에 오일이 공급될 수 있다. 이 경우, 기계식 오일펌프가 동작하여 자동변속기에 유압을 공급하는 동안에는 전동식 오일펌프가 동작하더라도 유압공급 능력은 추가로 향상되지 않으면서 오히려 전동식 오일펌프의 전력 소모량만 증가하는 문제점이 있다.In such a structure, oil may be supplied to the automatic transmission even when either pump is operated. In this case, while the mechanical oil pump is operated to supply hydraulic pressure to the automatic transmission, even if the electric oil pump operates, the hydraulic supply capability is not further improved, but rather, the power consumption of the electric oil pump is increased.
도 2는 기계식 오일펌프의 회전수에 따른 전동식 오일펌프의 전력소모량을 도시한 그래프이다. 이 그래프에 따르면 기계식 오일펌프의 회전수가 높을수록 전동식 오일펌프의 전력 소모가 증가함을 알 수 있으며, 기계식 오일펌프와 전동식 오일펌프가 동시에 작동할 때 에너지 소모량이 과대함을 알 수 있다.2 is a graph showing the power consumption of the electric oil pump according to the rotational speed of the mechanical oil pump. According to this graph, the higher the rotation speed of the mechanical oil pump, the higher the power consumption of the electric oil pump, and the higher the energy consumption when the mechanical oil pump and the electric oil pump operate simultaneously.
따라서, 기계식 오일펌프와 전동식 오일펌프가 장착된 하이브리드 자동차의 자동변속기에서 전동식 오일펌프의 작동을 최적화하여 제어할 필요가 있다.Therefore, there is a need to optimize and control the operation of the electric oil pump in an automatic transmission of a hybrid vehicle equipped with a mechanical oil pump and an electric oil pump.
상술한 종래기술의 필요성을 충족하기 위한 이 발명의 목적은, 자동변속기에서 필요로 하는 요구유압에 따른 입력축의 최소 회전속도를 계산하고 현재 자동변속기 입력축의 회전속도를 측정하여 그 차이가 보상되도록 전동식 오일펌프를 제어하는 방법을 제공하기 위한 것이다.An object of the present invention for meeting the needs of the prior art described above is to calculate the minimum rotation speed of the input shaft according to the required hydraulic pressure required by the automatic transmission, and to measure the rotation speed of the current automatic transmission input shaft to compensate for the difference. It is to provide a method for controlling an oil pump.
상술한 목적을 달성하기 위한 이 발명에 따른 하이브리드 자동차의 전동식 오일펌프 제어방법은, 엔진토크와 모터토크와 오일온도의 정보가 입력되면 변속기 요구유압 및 최소 목표 회전속도를 계산하는 제1단계와, 현재 변속기의 회전속도와 회전감가속도를 계산하는 제2단계와, 상기 변속기의 최소 목표 회전속도와 상기 현재 변속기의 회전속도와 회전감가속도를 이용하여 상기 변속기 요구유압 대비 현재 유압이 미달되는지를 판단하는 제3단계와, 상기 제3단계의 판단결과에 따라 전동식 오일펌프의 온/오프 및 구동속도를 결정하는 제4단계를 포함한 것을 특징으로 한다.An electric oil pump control method for a hybrid vehicle according to the present invention for achieving the above object includes a first step of calculating a required hydraulic pressure and a minimum target rotational speed when information of engine torque, motor torque, and oil temperature is input; A second step of calculating the rotational speed and rotational deceleration of the current transmission; and determining whether the current oil pressure is less than the required hydraulic pressure by using the minimum target rotational speed of the transmission, the rotational speed and the rotational deceleration of the current transmission. And a fourth step of determining on / off and driving speed of the electric oil pump according to the determination result of the third step.
이 발명에 따르면 자동변속기에 제공되는 유압이 요구유압에 미달되거나 미달될 가 능성이 있을 때 전동식 오일펌프가 구동되도록 함으로써, 전동식 오일펌프에서의 전력소모를 최적화할 수 있고 연비를 향상시킬 수 있는 효과가 있다.According to the present invention, the electric oil pump is driven when the hydraulic pressure provided to the automatic transmission is less than or equal to the required hydraulic pressure, thereby optimizing power consumption in the electric oil pump and improving fuel efficiency. There is.
이하, 첨부된 도면을 참조하며 이 발명의 한 실시예에 따른 하이브리드 자동차의 전동식 오일펌프 제어방법을 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail an electric oil pump control method of a hybrid vehicle according to an embodiment of the present invention.
도 3은 이 발명의 한 실시예에 따른 하이브리드 자동차의 전동식 오일펌프 제어방법의 개략적인 흐름도이다.3 is a schematic flowchart of a method for controlling an electric oil pump of a hybrid vehicle according to an embodiment of the present invention.
이 발명의 전동식 오일펌프 제어방법은 변속기 제어부(미도시)에서 수행된다. 변속기 제어부는 엔진토크와 모터토크와 오일온도의 정보가 입력되면(S310), 변속기 요구유압 및 입력축의 최소 회전속도를 계산한다(S320). 한편, 현재 변속기 입력축의 회전속도를 입력받아 그 시간 미분값을 계산한다(S330). 단계 S320에서 계산한 변속기 요구유압 대비 현재 유압이 미달되거나 미달 가능하다고 판단되면(S340), 그 미달 정도에 따라 전동식 오일펌프의 온/오프 및 그 구동속도를 결정한다(S350).The electric oil pump control method of the present invention is performed in a transmission control unit (not shown). The transmission controller calculates the minimum required rotational speed of the transmission hydraulic pressure and the input shaft when the information of the engine torque, the motor torque and the oil temperature is input (S310). Meanwhile, the rotation speed of the current transmission input shaft is input and the time differential value is calculated (S330). If it is determined that the current hydraulic pressure is less than or less than the transmission required hydraulic pressure calculated in step S320 (S340), the on / off of the electric oil pump and its driving speed are determined according to the insufficient degree (S350).
도 4는 이 발명의 한 실시예에 따른 하이브리드 자동차의 전동식 오일펌프 제어방법의 상세한 흐름도이다.4 is a detailed flowchart of a method for controlling an electric oil pump of a hybrid vehicle according to an embodiment of the present invention.
단계 S310에서 기어단수와, 모터토크와 엔진토크와 변속기 오일온도가 입력된다.In step S310, the gear stage, the motor torque, the engine torque, and the transmission oil temperature are input.
단계 S320은 단계 S321 내지 단계 S329로 이루어진다. 단계 S310에서 입력된 기어단수와 모터토크와 엔진토크를 이용하여 기어단별 입력토크 대비 클러치 및 브레이 크 최소 요구유압을 판단한다(S321). 한편, 엔진토크를 이용하여 엔진 클러치 입력토크 대비 최소 요구유압을 판단한다(S322).Step S320 consists of steps S321 to S329. The minimum required hydraulic pressure of the clutch and the brake is compared to the input torque for each gear stage by using the gear stage, the motor torque, and the engine torque input in step S310 (S321). On the other hand, the minimum required hydraulic pressure to determine the engine clutch input torque using the engine torque (S322).
단계 S321에서 구한 기어단별 입력토크 대비 클러치 및 브레이크 최소 요구유압과 엔진 클러치 입력토크 대비 최소 요구유압 중 최대값을 출력한다(S323).The maximum value of the minimum required hydraulic pressure against the clutch and brake torque and the minimum required hydraulic pressure against the engine clutch input torque obtained in step S321 is output (S323).
EC체결여부에 따라(S324), 전기차주행(EV)시 단계 S321에서 구한 기어단별 입력토크 대비 클러치 및 브레이크 최소 요구유압을 출력하고, 하이브리드 전기차주행(HEV)시 단계 S323에서 구한 최대값을 출력한다(S325).Depending on whether the EC is fastened (S324), the clutch and brake minimum required hydraulic pressure is output relative to the input torque for each gear stage obtained in step S321 during electric vehicle driving (EV), and the maximum value obtained in step S323 during hybrid electric vehicle driving (HEV) is output. (S325).
솔레노이드 밸브 구동 최소유압이 4 bar(S326)와, 단계 S325에서 출력되는 값을 비교하여 두 값 중 최대값을 출력하여(S327), 최소한 솔레노이드 밸브 구동 최소유압이 출력될 수 있도록 한다.The solenoid valve driving minimum hydraulic pressure is 4 bar (S326) and the value output in step S325 is compared to output the maximum of the two values (S327), so that the solenoid valve driving minimum hydraulic pressure can be output.
이 단계 S327에서 출력되는 값이 변속기 오일 목표 압력지령이며(S328), 요구유압이 확보 가능한 기계식 오일펌프의 최소 목표 회전속도를 계산한다(S329).The value output in this step S327 is the transmission oil target pressure command (S328), and the minimum target rotational speed of the mechanical oil pump which can secure the required hydraulic pressure is calculated (S329).
단계 S330은 단계 S331과 S332로 이루어지며, 단계 S331에서는 변속기 회전속도가 계산되고 단계 S332에서는 변속기 회전속도의 시간의 미분값인 변속기 회전감가속도가 계산된다.Step S330 is composed of steps S331 and S332. In step S331, the transmission rotation speed is calculated, and in step S332, the transmission rotation deceleration, which is a derivative of the time of the transmission rotation speed, is calculated.
단계 S340은 단계 S341 내지 단계 S346으로 이루어진다. 단계 S331에서 계산된 변속기 회전속도와 단계 S329에서 계산된 최소 목표 회전속도를 감산하고(S341), 그 회전수차이값(delta rpm)과 0을 비교한다(S342). 단계 S342의 비교결과, 그 회전수차이값이 0보다 작지 않으면 단계 S332에서 계산된 변속기 회전감가속도를 이용하여 기계식 오일펌프의 토출압부족이 예상되는 시간을 계산한다(S343). 아울 러, 전동식 오일펌프의 목표 유압 반응시간을 판단한다(S344). Step S340 is made up of steps S341 to S346. The transmission rotation speed calculated in step S331 and the minimum target rotation speed calculated in step S329 are subtracted (S341), and the rotation aberration value (delta rpm) is compared with 0 (S342). As a result of the comparison in step S342, if the rotational aberration difference value is not less than zero, the time when the discharge pressure deficiency of the mechanical oil pump is expected is calculated using the transmission rotation deceleration calculated in step S332 (S343). In addition, the target hydraulic reaction time of the electric oil pump is determined (S344).
그 다음, 단계 S343에서 계산된 시간과 단계 S344에서 계산된 시간을 감산하여(S345), 그 시간차이값과 0을 비교한다(S346).Then, the time calculated in step S343 and the time calculated in step S344 are subtracted (S345), and the time difference value is compared with 0 (S346).
단계 S350은 단계 S351 내지 단계 S355로 이루어진다. 단계 S342의 비교결과 회전수차이값이 0보다 작으면 전동식 오일펌프를 온하는 것으로 결정한다(S351). 단계 S346의 비교결과 시간차이값이 0보다 작으면 전동식 오일펌프를 온하는 결정한다(S351). 단계 S346의 비교결과 시간차이값이 0보다 작지 않으면 전동식 오일펌프를 오프하는 결정한다(S352).Step S350 is made up of steps S351 to S355. If the result of the comparison in step S342 is smaller than zero, the determination is made as to turning on the electric oil pump (S351). If the time difference value is less than 0 as a result of the comparison in step S346, it is determined to turn on the electric oil pump (S351). If the time difference value is not less than zero as a result of the comparison in step S346, it is determined to turn off the electric oil pump (S352).
단계 S351과 같이 전동식 오일펌프를 온하는 결정한 경우, 변속기 오일온도와 아이들스탑(Idle Stop) 여부(S353)에 따라 전동식 오일펌프의 속도를 결정한다(S354). 도면에 도시된 예시로서, 초기구동시에는 2초간 최대속도 구동, 정상주행시에는 11 bar 토출 속도 구동, 아이들스탑(Idle Stop)시에는 5 bar 토출 예비 구동하는 것으로 결정한다. 전동식 오일펌프에 결정된 속도 지령을 출력한다(S355).If it is determined in step S351 to turn on the electric oil pump, the speed of the electric oil pump is determined according to the transmission oil temperature and whether the idle stop (Idle Stop) (S353) (S354). As an example shown in the drawings, it is determined that the maximum speed driving for 2 seconds during the initial driving, the driving speed of 11 bar discharge during normal driving, preliminary driving 5 bar discharge during the idle stop (Idle Stop). The determined speed command is output to the electric oil pump (S355).
도 5는 도 4의 실시예를 하드웨어로 구성한 제어로직이다. 도 5의 제어로직의 동작은 도 4와 동일한 바, 그 상세한 설명은 생략한다.5 is a control logic in which the embodiment of FIG. 4 is constructed in hardware. The operation of the control logic of FIG. 5 is the same as that of FIG. 4, and a detailed description thereof will be omitted.
도 1은 일반적인 하이브리드 자동차의 자동변속기의 오일 공급시스템을 도시한 도면,1 is a view showing an oil supply system of an automatic transmission of a general hybrid vehicle,
도 2는 기계식 오일펌프의 회전수에 따른 전동식 오일펌프의 전력소모량을 도시한 그래프,2 is a graph showing the power consumption of the electric oil pump according to the rotational speed of the mechanical oil pump,
도 3은 이 발명의 한 실시예에 따른 하이브리드 자동차의 전동식 오일펌프 제어방법의 개략적인 흐름도,3 is a schematic flowchart of a method for controlling an electric oil pump of a hybrid vehicle according to an embodiment of the present invention;
도 4는 이 발명의 한 실시예에 따른 하이브리드 자동차의 전동식 오일펌프 제어방법의 상세한 흐름도,4 is a detailed flowchart of a method for controlling an electric oil pump of a hybrid vehicle according to an embodiment of the present invention;
도 5는 도 4의 흐름도를 하드웨어로 구성한 제어로직이다.5 is a control logic in which the flowchart of FIG. 4 is constructed in hardware.
Claims (5)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101241210B1 (en) * | 2010-12-07 | 2013-03-13 | 기아자동차주식회사 | Oil pump controlling systen of hybrid vehicle and method thereof |
| KR101481335B1 (en) * | 2013-11-20 | 2015-01-09 | 현대자동차주식회사 | Shifting control method for hybrid vehicle |
| KR20160007860A (en) | 2014-07-04 | 2016-01-21 | 현대자동차주식회사 | Drive control method and system for electric oil pump |
| KR20160062313A (en) | 2014-11-24 | 2016-06-02 | 현대자동차주식회사 | Method for controlling electric oil pump of vehicle |
| US9925859B2 (en) | 2015-12-15 | 2018-03-27 | Hyundai Motor Company | Apparatus for controlling hybrid vehicle having engine oil pump and method thereof |
| US10012308B2 (en) | 2016-03-16 | 2018-07-03 | Hyundai Motor Company | Apparatus and method for controlling electric oil pump |
| KR20210122939A (en) * | 2020-04-01 | 2021-10-13 | 현대자동차주식회사 | Oil Pump, Vehicle having the oil pump and method for controlling the vehicle |
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| US9168913B2 (en) | 2013-07-11 | 2015-10-27 | Hyundai Motor Company | Oil pump system of hybrid vehicle and method for controlling the same |
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| JP4222349B2 (en) | 2005-08-25 | 2009-02-12 | トヨタ自動車株式会社 | Hybrid vehicle and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101241210B1 (en) * | 2010-12-07 | 2013-03-13 | 기아자동차주식회사 | Oil pump controlling systen of hybrid vehicle and method thereof |
| US8747074B2 (en) | 2010-12-07 | 2014-06-10 | Hyundai Motor Company | Oil pump controlling system of hybrid vehicle and method thereof |
| US9109692B2 (en) | 2010-12-07 | 2015-08-18 | Hyundai Motor Company | Oil pump controlling system of hybrid vehicle and method thereof |
| KR101481335B1 (en) * | 2013-11-20 | 2015-01-09 | 현대자동차주식회사 | Shifting control method for hybrid vehicle |
| US9109693B2 (en) | 2013-11-20 | 2015-08-18 | Hyundai Motor Company | Method of controlling shifting of gears in hybrid vehicle |
| KR20160007860A (en) | 2014-07-04 | 2016-01-21 | 현대자동차주식회사 | Drive control method and system for electric oil pump |
| KR20160062313A (en) | 2014-11-24 | 2016-06-02 | 현대자동차주식회사 | Method for controlling electric oil pump of vehicle |
| US9925859B2 (en) | 2015-12-15 | 2018-03-27 | Hyundai Motor Company | Apparatus for controlling hybrid vehicle having engine oil pump and method thereof |
| US10012308B2 (en) | 2016-03-16 | 2018-07-03 | Hyundai Motor Company | Apparatus and method for controlling electric oil pump |
| KR20210122939A (en) * | 2020-04-01 | 2021-10-13 | 현대자동차주식회사 | Oil Pump, Vehicle having the oil pump and method for controlling the vehicle |
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