KR100897271B1 - Improved slip mode logic for electric hydraulic power steering - Google Patents
Improved slip mode logic for electric hydraulic power steering Download PDFInfo
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- KR100897271B1 KR100897271B1 KR1020070126651A KR20070126651A KR100897271B1 KR 100897271 B1 KR100897271 B1 KR 100897271B1 KR 1020070126651 A KR1020070126651 A KR 1020070126651A KR 20070126651 A KR20070126651 A KR 20070126651A KR 100897271 B1 KR100897271 B1 KR 100897271B1
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- 239000003921 oil Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed
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- Combustion & Propulsion (AREA)
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- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
본 발명은 전동유압식 파워스티어링용 슬립모드 개선로직에 관한 것으로서, 초기 주행 중 일정 차속 이하, 스티어링 변화율이 일정수준 이하, 및 작동전류가 일정 전류 이하의 각 조건이 일정시간 유지될 시 작동하는 슬립모드 조건에 있어서 상기 슬립모드 조건에 펌프내 작동 유온을 확인하는 로직이 더 포함되어 구성되는 것을 특징으로 한다. The present invention relates to a sleep mode improvement logic for electro-hydraulic power steering, wherein a sleep mode which operates when a predetermined vehicle speed, a steering change rate is below a certain level, and an operating current is below a certain current is maintained for a predetermined time during initial driving. In the condition, the sleep mode condition is characterized in that it further comprises a logic for checking the operating oil temperature in the pump.
차속, 스티어링 변화율, 작동전류, 펌프내 작동 유온. Vehicle speed, steering change rate, operating current, operating oil temperature in the pump.
Description
본 발명은 전동유압식 파워스티어링용 슬립모드 개선로직에 관한 것으로서, 더욱 상세하게는 초기 주행 중 슬립모드 진입시 펌프 내 작동유온을 확인하는 로직을 추가하여 조타력을 향상시켜 운전자의 안전 및 운전성 향상을 시킨 전동유압식 파워스티어링용 슬립모드 개선로직에 관한 것이다. The present invention relates to a sleep mode improvement logic for electro-hydraulic power steering, and more particularly, to add steering logic to check the operating oil temperature in the pump when entering the sleep mode during initial driving to improve steering power to improve driver safety and driveability. It relates to a sleep mode improvement logic for the electro-hydraulic power steering.
일반적으로 실제 도로에서 차량 주행 중 조향이 이루어지는 기간은 전체 주행 시간의 10% 미만인 것으로 알려져 있으며, 이 중 상당 부분은 주행 초기 즉, 주차 공간에서 차량 이동시 많은 조향이 이루어지고 있다. In general, it is known that the steering period during the driving of the vehicle on the actual road is less than 10% of the total driving time, and much of the steering is performed at the beginning of driving, that is, when the vehicle is moved in the parking space.
즉, 주행 초기 조건에서 펌프 출구 압력을 일정 수준이상 확보를 위해서는 엔진의 펌프 구동 토크가 필요하고, 주행 중 무조타시에는 펌프 출구 압력을 감소시켜 소모 에너지를 줄임으로써 엔진의 에너지 소비를 저감할 수 있게 되는 것이다.In other words, the pump drive torque of the engine is required to secure the pump outlet pressure above a certain level in the initial driving conditions, and when the vehicle is not steered while driving, the engine power consumption can be reduced by reducing the pump outlet pressure to reduce the energy consumption. Will be.
따라서, 기존의 엔진 회전수에 감응하여 유압펌프를 작동시켜 조타력을 보조하는 유압식 파워스티어링을 대비하여 전동모터로 유압펌프를 작동시켜 차속 및 조타각에 따라 조타력을 보조하는 전동유압식 파워스티어링(EHPS)를 사용하여 에너지 효율을 극대화하여 연비를 향상하고 있다. Therefore, in preparation for hydraulic power steering that assists steering power by operating a hydraulic pump in response to the existing engine speed, an electro-hydraulic power steering that assists steering power according to vehicle speed and steering angle by operating a hydraulic pump with an electric motor ( EHPS) improves fuel efficiency by maximizing energy efficiency.
그리고 기존의 엔진 동력을 이용하여 작동되는 유압식 파워스티어링 펌프 방식에서 전기적 전원을 받아 모터를 구동하여 펌프를 작동하는 유압식 파워스티어링 시스템은 엔진과 별개 시스템으로 독립적으로 제어하므로 기존 유압식 구동벨트 및 풀리 제거가 할 수 있게 되는 것이다. In addition, the hydraulic power steering system that operates the motor by driving the motor by receiving electric power from the hydraulic power steering pump operated using the existing engine power is controlled independently of the engine, thus eliminating the existing hydraulic drive belt and pulley. You can do it.
즉, 상기 전동유압식은 연비 측면(에너지 효율)에서 가장 큰 장점이 주행 중 무조타 상태에서의 부하를 조절할 수 있다는 것이다. 사실 조타중 에너지 소모는 기존 유압식이든 전동유압식이든 동일한 수준이지만(유압식인 경우 엔진측면에서 Mechanical Loss측면일 것이고, 전동유압식의 경우는 Electric Loss로 그 형태만 다를 뿐 소모는 동일) 무조타 상태에서는 경우에는 유압식인 경우 엔진과 벨트로 연결되어 있기 때문에 Pump speed와 마찰이라는 측면에서 자유로울 수 없으며, 전동유압식의 경우는 전동모터로 펌프를 조작하므로 제어 로직 변화에 따른 에너지 효율을 극대화 할 수 있는 것이다. That is, the electro-hydraulic type is the biggest advantage in terms of fuel efficiency (energy efficiency) is that it can adjust the load in the non-steering state while driving. In fact, the energy consumption during steering is the same level of the existing hydraulic or electro-hydraulic type (in the case of hydraulic type, it will be the mechanical loss side from the engine side, and in the case of the electro-hydraulic type, the loss is the same but the form is different). In case of hydraulic type, it is not free in terms of pump speed and friction because it is connected by engine and belt. In the case of electric hydraulic type, the pump is operated by electric motor to maximize energy efficiency according to control logic change.
여기서 무조타 상태에 대해서 좀더 보충설명하면, 상기 무조타 상태를 "Sleep"이라는 모드를 정의하고 있으며 상기 슬립모드 진입시 작동 전류는 1.5A 수준까지 떨어뜨리며 알터네이터에 최소한 부하로 작용하게 되어 소모 에너지를 최소한으로 유지하게 되며, 해제될 경우에는 작동 전류를 6~7A로 유지하고 조타에 필요한 전기 에너지를 유지하게 된다. Here, the non-steering state is further explained. The non-steering state is defined as a mode called “Sleep.” When the sleep mode is entered, the operating current drops to a level of 1.5 A and acts as a load on the alternator to minimize energy consumption. When released, it maintains the operating current at 6 ~ 7A and maintains the electrical energy required for steering.
즉, 슬립모드 진입 조건은 일정 차속 이하, 스티어링 변화율이 일정수준 이하, 작동전류가 일정 전류 이하, 모든 조건이 일정시간 유지될 경우이고, 슬립모드 해제 조건은 일정 차속 이상(고차속에서의 안전성을 위해) 또는 스티어링 변화율이 일정 수준 이상 또는 작동전류가 일정 이상일 경우를 말한다. That is, the sleep mode entry condition is below a certain vehicle speed, the steering change rate is below a certain level, the operating current is below a certain current, and all the conditions are maintained for a certain time, and the sleep mode release condition is above a certain vehicle speed (safety at a high vehicle speed). Or if the steering change rate is above a certain level or the operating current is above a certain level.
그러나 기존의 로직의 경우 운전 초기 즉, 펌프 내 유온의 온도가 일정 수준이상으로 상승하지 않은 상태에서 잦은 슬립모드를 진입하게 되면, 펌프 작동 전류가 낮아 조타력이 부족하여 심각한 조향 문제가 발생하는 문제점이 있었다. However, in the case of the conventional logic, when entering the frequent sleep mode in the initial operation, that is, the temperature of the oil temperature in the pump does not rise above a certain level, a serious steering problem occurs due to the lack of steering power due to the low pump operating current. There was this.
즉, 초기 주행에서 슬립모드 중 갑작스런 조향이 이루어졌을 때 모터가 작동유온이 낮은 상태인 펌프(유체 점도 상승으로 펌프 출구 압력이 높아 구동 토크가 커짐)를 제대로 구동하지 못해, 조타력 부족으로 필드 문제가 발생하는 문제점이 있었다.In other words, when sudden steering is performed during the sleep mode during initial driving, the motor fails to properly drive the pump (low pump pressure due to the increase of fluid viscosity due to the increase of fluid viscosity) because the motor has a low operating oil temperature. There was a problem that occurred.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 초기 주행 중 슬립모드 진입시 펌프 내 작동유온을 확인하는 로직을 추가하여 조타력을 향상시켜 운전자의 안전 및 운전성 향상을 시킨 전동유압식 파워스티어링용 슬립모드 개선로직을 제공하는데 목적이 있다. The present invention has been made in order to solve the above problems, by adding a logic to check the operating oil temperature in the pump when entering the sleep mode during the initial driving to improve the steering power to improve the safety and driving performance of the electric hydraulic power steering The purpose is to provide an improved logic for sleep mode.
상기와 같은 목적을 달성하기 위하여, 초기 주행 중 일정 차속 이하, 스티어링 변화율이 일정수준 이하, 및 작동전류가 일정 전류 이하의 각 조건이 일정시간 유지될 시 작동하는 슬립모드 조건에 있어서 상기 슬립모드 조건에 펌프내 작동 유온이 일정 이상의 조건을 더 포함되어 구성되는 것을 특징으로 한다. In order to achieve the above object, the sleep mode condition in a sleep mode condition that operates when each condition below a certain vehicle speed, a steering change rate is below a certain level, and the operating current is below a certain current during a certain period of time during the initial driving. The operating oil temperature in the pump is characterized in that the configuration further comprises a predetermined or more conditions.
본 발명에 따르면, 초기 주행 중 슬립모드 진입시 펌프 내 작동유온을 확인하는 로직을 추가하여 조타력을 향상시켜 운전자의 안전 및 운전성 향상시킬 수 있는 효과가 있다. According to the present invention, by adding a logic for checking the operating oil temperature in the pump when entering the sleep mode during the initial driving, the steering power is improved, thereby improving the safety and the driver's driving ability.
이하, 본 발명의 구성을 첨부된 도면을 참조로 설명하면, 도 1은 본 발명에 따른 전동유압식 파워스티어링용 슬립모드 개선로직을 나타낸 구성도이고, 도 2는 본 발명에 따른 전동유압식 파워스티어링용 슬립모드 개선로직를 나타낸 순차도이다. .Hereinafter, with reference to the accompanying drawings, the configuration of the present invention, Figure 1 is a schematic view showing a sleep mode improved logic for the electro-hydraulic power steering in accordance with the present invention, Figure 2 is for the electro-hydraulic power steering in accordance with the present invention This is a sequential diagram showing the logic of improving sleep mode. .
본 발명의 전동유압식 파워스티어링용 슬립모드 개선로직은 기존의 일정 차속 이하, 스티어링 변화율이 일정수준 이하, 및 작동전류가 일정 전류 이하의 각 조건이 일정시간 유지될 시 작동하는 슬립모드 조건에 펌프 내 작동유온을 확인하는 로직을 추가하여 구성된다.The slip mode improvement logic for the electrohydraulic power steering of the present invention is a pump in a sleep mode condition that operates when each condition is maintained for a predetermined time below a predetermined constant vehicle speed, a steering change rate is below a certain level, and an operating current is below a constant current. It is configured by adding logic to check the oil temperature.
즉, 본 발명의 슬립모드 조건은, That is, the sleep mode condition of the present invention,
운전자의 스티어링 조작 의지를 표현하고 일정 작동 전류 이하 일때 나타나는 작동전류(300)와, 주행 차량의 속도를 고려하고 일정 스티어링 변화율이 이하 일때 나타나는 스티어링 변화율(200)과, 일정차속이하 일때 나타나는 차속(100)과, 조향 문제를 해결하기 위한 일정 온도 이상의 펌프내 작동 유온(400)의 조건이 적용될 때 작동하게 되는 것이다. The driver's willingness to operate the steering wheel and the operating current (300) appears when below a certain operating current, the steering change rate (200) appears when the constant steering change rate is less than considering the speed of the driving vehicle, and the vehicle speed (100) when below a certain vehicle speed And, when the condition of the
즉, 상기 슬립모드 진입조건은 작동전류가 일정작동전류 이하이고, 차속이 일정 이하이며, 스티어링 변화율이 일정 이하이고, 펌프내 작동유온이 일정 이상일 경우 작동을 하게 되는 것이다. That is, the sleep mode entry condition is to operate when the operating current is less than the constant operating current, the vehicle speed is less than the constant, the steering change rate is less than the constant, the hydraulic oil temperature in the pump is more than the predetermined.
상기와 같이 구성되는 전동유압식 파워스티어링용 슬립모드 개선로직의 실시 예를 설명하면 다음과 같다. An embodiment of the sleep mode improvement logic for the electrohydraulic power steering configured as described above is as follows.
일반 모드 주행조건에서 차속(S100)이 5kph 이상일 경우는 일반 모드 주행 조건으로 인식하고 그 이하일 경우에는 다음 단계인 스티어링 변화율의 단계(S200)로 진입한다. If the vehicle speed S100 is 5 kph or more in the normal mode driving condition, the vehicle is recognized as the normal mode driving condition. If the vehicle speed S100 is less than the driving mode, the vehicle enters the next step S200 of the steering change rate.
그리고 상기 스티어링 변화율 단계(S200)에서 스티어링 변화율이 8°/sec 이상일 경우는 일반 모드 주행 조건으로 인식하고 그 이하일 경우에는 다음 단계인 작동 전류 단계(S300)로 진입한다. In the steering change rate step S200, when the steering change rate is 8 ° / sec or more, the steering change rate is recognized as a normal mode driving condition.
다음으로 상기 작동 전류 단계(S300)에서 작동전류가 15A 이상일 경우는 일 반 모드 주행 조건으로 인식하고 그 이하일 경우에는 다음 단계인 작동 유온 단계(S400)으로 진입한다.Next, when the operating current is 15A or more in the operating current step (S300), it is recognized as a normal mode driving condition, and when it is less than that, it enters the next step, the operating oil temperature step (S400).
그리고 상기 작동 유온 단계(S400)에서 작동 유온이 일정온도 이하일 경우는 일반 모드 주행 조건으로 인식하고 그 이상일 경우는 상기 각 조건의 유지 시간 단계(S500)로 진입한다.In the operating oil temperature step S400, when the operating oil temperature is lower than or equal to a predetermined temperature, the operating oil temperature is recognized as a normal mode driving condition. If the operating oil temperature is higher than the operating oil temperature step S400, the operating oil temperature step S500 is entered.
즉, 상기 각 조건의 유지 시간 단계에서 그 시간이 5000ms이상일 경우에는 일반 모드 주행 조건으로 인식하고 그 미만일 경우는 모든 조건을 만족하므로 슬립모드 조건에 진입하게 되는 것이다. That is, when the time is 5000 ms or more in the maintenance time step of each condition, if it is recognized as the normal mode driving condition, if it is less than all the conditions are satisfied and enters the sleep mode condition.
이와 같이 슬립모드 진입 조건에 펌프내 작동 유온 조건을 추가하여 주행중 조타력 및 운전 안전성을 추가적으로 고려할 수 있게 되는 것이다. As such, the operating oil temperature condition in the pump is added to the sleep mode entry condition to further consider steering power and driving safety during driving.
도 1은 본 발명에 따른 전동유압식 파워스티어링용 슬립모드 개선로직을 나타낸 구성도. 1 is a block diagram showing the improved logic of the slip mode for the electro-hydraulic power steering according to the present invention.
도 2는 본 발명에 따른 전동유압식 파워스티어링용 슬립모드 개선로직를 나타낸 순차도.Figure 2 is a sequential diagram showing the slip mode improvement logic for the electro-hydraulic power steering in accordance with the present invention.
※ 도면의 주요부분에 대한 부호의 설명. ※ Explanation of symbols for main part of drawing.
100 : 차속, 100: vehicle speed,
200 : 스티어링 변화율, 200: steering change rate,
300 : 작동전류, 300: working current,
400 : 펌프내 작동 유온.400: The operating oil temperature in the pump.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070126651A KR100897271B1 (en) | 2007-12-07 | 2007-12-07 | Improved slip mode logic for electric hydraulic power steering |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020070126651A KR100897271B1 (en) | 2007-12-07 | 2007-12-07 | Improved slip mode logic for electric hydraulic power steering |
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| KR100897271B1 true KR100897271B1 (en) | 2009-05-14 |
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| KR1020070126651A Expired - Fee Related KR100897271B1 (en) | 2007-12-07 | 2007-12-07 | Improved slip mode logic for electric hydraulic power steering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4477496A1 (en) * | 2023-06-15 | 2024-12-18 | KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH | Method and control unit for operating a steering unit for a commercial vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0930215A1 (en) | 1997-08-13 | 1999-07-21 | Koyo Seiko Co., Ltd. | Power steering system |
| JP2005029111A (en) | 2003-07-11 | 2005-02-03 | Mazda Motor Corp | Electr0-hydraulic power steering system |
| US7164978B2 (en) | 2004-06-24 | 2007-01-16 | Mitsubishi Denki Kabushiki Kaisha | Vehicle electro-hydraulic power steering unit |
-
2007
- 2007-12-07 KR KR1020070126651A patent/KR100897271B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0930215A1 (en) | 1997-08-13 | 1999-07-21 | Koyo Seiko Co., Ltd. | Power steering system |
| JP2005029111A (en) | 2003-07-11 | 2005-02-03 | Mazda Motor Corp | Electr0-hydraulic power steering system |
| US7164978B2 (en) | 2004-06-24 | 2007-01-16 | Mitsubishi Denki Kabushiki Kaisha | Vehicle electro-hydraulic power steering unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4477496A1 (en) * | 2023-06-15 | 2024-12-18 | KNORR-BREMSE Systeme für Nutzfahrzeuge GmbH | Method and control unit for operating a steering unit for a commercial vehicle |
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