CN105201664A - Diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling EGR rate - Google Patents
Diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling EGR rate Download PDFInfo
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- CN105201664A CN105201664A CN201510768773.9A CN201510768773A CN105201664A CN 105201664 A CN105201664 A CN 105201664A CN 201510768773 A CN201510768773 A CN 201510768773A CN 105201664 A CN105201664 A CN 105201664A
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- egr
- control unit
- egr valve
- ecu control
- engine
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Abstract
The invention discloses a diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling the EGR rate. The system comprises an EGR valve, and an ECU control unit for controlling the opening degree of the EGR valve, wherein the input end of the ECU control unit is connected with a signal collection unit; the output end of the ECU control unit is connected with the controlled end of the EGR valve; the signal collection unit comprises an air flow sensor connected with the input ports of the ECU control unit. According to the system, air flow entering an engine is used as a control target, so that an aim of accurately controlling the EGR rate of the engine under various working conditions. The system can not be influenced by pipeline change and production consistency and has the characteristics of being high in control accuracy, stable in control, good in durability and low in production consistency requirement on parts such as the EGR valve.
Description
Technical field
The present invention relates to diesel engine technical field, particularly a kind of diesel engine EGR system.
Background technique
(be called for short at engine exhaust-gas recirculating system, egr system) in, exhaust gas flow can be regulated by regulating the size of EGR valve aperture, return cylinder after waste gas is mixed by a certain percentage with fresh air and carry out recirculation, temperature and velocity of combustion is burnt, further thus reduce NO to reduce cylinder combustion
xdischarge amount.Along with emission standard is more and more stricter, diesel engine uses the route of egr system very general, the control strategy major part meeting the egr system of non-rice habitats state three standard is all the target using the aperture size of EGR valve as closed loop control, so when the conformity of production of pipeline in EGR valve or egr system is done badly, or when after motor service time is of a specified duration, the gas flow area of whole egr system can change, EGR rate will change, thus affects the exhaust index of motor.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of not by the diesel engine EGR system that pipeline change and conformity of production affect, and to realize the accurate control of EGR rate, improve the discharge durability of motor discharge conformity and motor.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows.
Accurately can control a diesel engine EGR system for EGR rate, comprise EGR valve and the ECU control unit for controlling EGR valve aperture, the input end of described ECU control unit is connected with signal gathering unit, and the output terminal of ECU control unit connects the controlled end of EGR valve; Described signal gathering unit comprises the air flow sensor be connected with ECU control unit input port respectively.
The above-mentioned diesel engine EGR system that accurately can control EGR rate, described signal gathering unit also comprises temperature transducer, speed probe and air inlet pressure sensor.
Owing to have employed above technological scheme, the invention technological progress is as follows.
Instant invention overcomes the deficiency of conventional art, air flow sensor is adopted to monitor the amount of fresh air entering diesel engine cylinder, using air mass flow as the target controlled, namely under a certain operating mode, air mass flow is write ECU as scalar quantity, ECU then controls the aperture of EGR valve according to the air quantity calibration value of different operating mode, the object of the EGR rate of motor under each operating mode of the accurate control of realization, by pipeline change and the impact of conformity of production, have control accuracy high, control to stablize, good endurance, the features such as low required to the conformity of production of the component such as EGR valve.The present invention is applied on diesel engine, can improve the discharge conformity of motor and the discharge durability of motor.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Wherein: 1.ECU control unit, 2.EGR valve, 3. temperature transducer, 4. speed probe, 5. air flow sensor, 6. air inlet pressure sensor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.
A kind of diesel engine EGR system that accurately can control EGR rate, its structure as shown in Figure 1, comprise EGR valve 2, ECU control unit 1 and signal gathering unit, the input end of ECU control unit is connected with signal gathering unit, and the output terminal of ECU control unit connects the controlled end of EGR valve.ECU control unit 1 controls the aperture of EGR valve for the information gathered according to signal gathering unit, the EGR rate of motor under each operating mode of further accurately control.
In the present embodiment, signal gathering unit comprises air flow sensor 5, air flow sensor 5 is installed on the air inlet of motor, for monitoring the flow of the fresh air entering cylinder, and feed back to ECU control unit in real time, ECU control unit controls the opening and closing of EGR valve according to the feedback signal of air flow sensor, thus realizes the object accurately controlling EGR rate.
Signal gathering unit of the present invention also comprises temperature transducer 3, speed probe 4 and air inlet pressure sensor 6.Cooling-water temperature sensor 3 for gathering the temperature signal of engine coolant, and is revised by the aperture of ECU control unit 1 pair of EGR valve 2.Air inlet pressure sensor 6 is used for gathering the boost pressure signal of motor, air inlet pressure sensor 6 to be contained in after engine booster on pipeline, when engine speed is constant, the pressure after the change in torque of motor and supercharging is changing into linear relationship, so gather the torque signal of motor thus.Speed probe 4 is for gathering current rotating speed and the conversion variable signal of motor, at timing signal, demarcation personnel set rational fresh air flow by the rotating speed of each operating point and load in conjunction with the exhaust emissions of current working, after each operating point has all been demarcated, form air quantity map figure.
Demarcated air quantity map figure and corrected parameter are write with a brush dipped in Chinese ink ECU control unit, ECU control unit can calculate according to the signal of signal gathering unit collection, and the aperture size controlling EGR valve guarantees that the air quantity that air flow sensor monitors is equal with the required amount of fresh air of motor current working.
Claims (2)
1. one kind accurately can control the diesel engine EGR system of EGR rate, comprise EGR valve (2) and the ECU control unit (1) for controlling EGR valve aperture, the input end of described ECU control unit is connected with signal gathering unit, and the output terminal of ECU control unit connects the controlled end of EGR valve; It is characterized in that: described signal gathering unit comprises the air flow sensor (5) be connected with ECU control unit input port.
2. a kind of diesel engine EGR system that accurately can control EGR rate according to claim 1, is characterized in that: described signal gathering unit also comprises temperature transducer (3), speed probe (4) and air inlet pressure sensor (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510768773.9A CN105201664A (en) | 2015-11-12 | 2015-11-12 | Diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling EGR rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510768773.9A CN105201664A (en) | 2015-11-12 | 2015-11-12 | Diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling EGR rate |
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| Publication Number | Publication Date |
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| CN105201664A true CN105201664A (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510768773.9A Pending CN105201664A (en) | 2015-11-12 | 2015-11-12 | Diesel engine EGR (engine exhaust gas recirculation) system capable of accurately controlling EGR rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882301A (en) * | 2019-03-26 | 2019-06-14 | 中国第一汽车股份有限公司 | A kind of small-displacement gasoline engine waste gas and recycles control system |
Citations (5)
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| CN1664342A (en) * | 2005-03-18 | 2005-09-07 | 上海绍博车辆动力装置科技有限公司 | Engine electric control EGR system for vehicle |
| CN103016184A (en) * | 2012-11-07 | 2013-04-03 | 南岳电控(衡阳)工业技术有限公司 | Method and device for monitoring NOx emission capacity of electric control diesel engine EGR (Exhaust Gas Recirculation) system |
| CN104153903A (en) * | 2013-05-13 | 2014-11-19 | 吉林师范大学 | System and method for cooperatively controlling supercharged diesel engine EGR valve, VGT and throttle valve |
| CN104763543A (en) * | 2015-04-25 | 2015-07-08 | 无锡隆盛科技股份有限公司 | EGR system of supercharged diesel engine |
| CN205101126U (en) * | 2015-11-12 | 2016-03-23 | 无锡隆盛科技股份有限公司 | Diesel engine EGR system of can accurate control EGR rateing |
-
2015
- 2015-11-12 CN CN201510768773.9A patent/CN105201664A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664342A (en) * | 2005-03-18 | 2005-09-07 | 上海绍博车辆动力装置科技有限公司 | Engine electric control EGR system for vehicle |
| CN103016184A (en) * | 2012-11-07 | 2013-04-03 | 南岳电控(衡阳)工业技术有限公司 | Method and device for monitoring NOx emission capacity of electric control diesel engine EGR (Exhaust Gas Recirculation) system |
| CN104153903A (en) * | 2013-05-13 | 2014-11-19 | 吉林师范大学 | System and method for cooperatively controlling supercharged diesel engine EGR valve, VGT and throttle valve |
| CN104763543A (en) * | 2015-04-25 | 2015-07-08 | 无锡隆盛科技股份有限公司 | EGR system of supercharged diesel engine |
| CN205101126U (en) * | 2015-11-12 | 2016-03-23 | 无锡隆盛科技股份有限公司 | Diesel engine EGR system of can accurate control EGR rateing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882301A (en) * | 2019-03-26 | 2019-06-14 | 中国第一汽车股份有限公司 | A kind of small-displacement gasoline engine waste gas and recycles control system |
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Application publication date: 20151230 |
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