CN103267633B - For determining the Auto-Test System of lift of EGR valve - Google Patents
For determining the Auto-Test System of lift of EGR valve Download PDFInfo
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- CN103267633B CN103267633B CN201310148332.XA CN201310148332A CN103267633B CN 103267633 B CN103267633 B CN 103267633B CN 201310148332 A CN201310148332 A CN 201310148332A CN 103267633 B CN103267633 B CN 103267633B
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Abstract
The invention provides a kind of Auto-Test System for determining lift of EGR valve.This Auto-Test System at least comprises: the engine test table being equipped with initiatively dynamometer machine and toxic emission measuring and analysing meter; Parametric controller, for when be arranged on the diesel engine to be measured on described engine test table stable under the operating mode of described active Dynamometer Control after, adjust the lift of the EGR valve of described diesel engine to be measured based on pre-defined rule to control described EGR valve; And determination module, for determine the best lift of EGR valve under this operating mode in the information that each lift of EGR valve gathers according to described active dynamometer machine and toxic emission measuring and analysing meter.Advantage of the present invention comprises: can realize the automatic Calibration to lift of EGR valve, for R&D process saves a large amount of human and material resources and financial resources.
Description
Technical field
The present invention relates to EGR valve field, particularly relating to a kind of Auto-Test System for determining lift of EGR valve.
Background technology
EGR (EGR) is in engine working process, and a part of waste gas is drawn exhaust system, then sends into gas handling system participation burning, reduces the discharge capacity of NOx thus.NOx is a kind of to the great gas of harm, and it mainly generates under high-temperature oxygen-enriched condition.In engine working process kind, as in good time, in appropriate amount, portion is introduced in cylinder again, because of the principal ingredient CO in waste gas
2specific heat ratio is comparatively large, so the partial heat that burning produces can absorb and take cylinder out of by waste gas, and having certain diluting effect to combination gas, because this reducing maximum temperature and the oxygen content of engine combustion, thus decreasing the growing amount of NOx compound.
But excessive EGR will affect the normal work of engine, particularly when idling, slow-speed of revolution Smaller load and engine are in cold operation and require engine power performance in full load (WOT), the waste gas of recycle produces serious influence to the performance of engine.Therefore, should according to the change of the actual condition of engine and condition of work, adjustment participates in the exhausted air quantity of recycle automatically.Facts have proved, according to the difference of engine structure, the exhausted air quantity participating in recycle is generally changed to suitable between 6% ~ 13%.
In order to make amount of exhaust gas recirculation, excessive influence is not produced to engine performance, Modem electronic control engine have employed Closed-loop Control Strategy to EGR, EGR valve position transducer (vehicle had also adopts exhaust gas temperature sensor or pressure transducer) is set at exhaust gas recirculation valve place, Closed-cycle correction FEEDBACK CONTROL is carried out to the amount of exhaust gas recirculation of reality.The key of egr system makes enough exhaust gas recirculations to draft tube, and provide a best EGR rate according to the different operating modes of engine.Existing Optimum EGR rate control strategy is mainly divided into two kinds: FEEDBACK CONTROL and arteries and veins spectrogram control, because the working conditions change of diesel engine for automobile is violent, frequent, the response characteristic of FEEDBACK CONTROL is poor, controls so the core of the egr system control strategy of diesel engine for automobile is generally the reasonable arteries and veins spectrogram of response characteristic.Determine that the demarcation engineering of the lift of EGR valve arteries and veins spectrogram of optimum EGR rate is the longest, workload is maximum, cost is the highest part consuming time in whole egr system control strategy.
How efficiently automatically to complete the demarcation engineering of EGR lift arteries and veins spectrogram, to save human and material resources and the financial resources of R&D process, the real technical task having become those skilled in the art and needed to solve.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of Auto-Test System for determining lift of EGR valve, to realize the automatic Calibration of lift of EGR valve.
For achieving the above object and other relevant objects, the invention provides a kind of Auto-Test System for determining lift of EGR valve, it at least comprises:
The engine test table of initiatively dynamometer machine and toxic emission measuring and analysing meter is equipped with;
Parametric controller, for when be arranged on the diesel engine to be measured on described engine test table stable under the operating mode of described active Dynamometer Control after, adjust the lift of the EGR valve of described diesel engine to be measured based on pre-defined rule to control described EGR valve;
Determination module, for determining the best lift of EGR valve under this operating mode in the information that each lift of EGR valve gathers according to described active dynamometer machine and toxic emission measuring and analysing meter.
Preferably, described parametric controller at least comprises:
First load module, for obtaining the relevant information of described diesel engine to be measured;
Based on the repeatedly relevant information of described diesel engine to be measured, stable conditions determination module, for judging whether the operating mode of described diesel engine to be measured is stablized;
Automatic control module, for after described diesel engine to be measured is stable under the operating mode of described active Dynamometer Control, adjusts the lift of the EGR valve of described diesel engine to be measured in preset range based on predetermined step-length;
Output module, the lift based on described EGR valve exports corresponding EGR valve control signal and controls described EGR valve.
Preferably, described parametric controller at least also comprises:
Second load module, for access module control signal and lift of EGR valve information;
Manual control module, the lift for the EGR valve by described second load module access is supplied to described output module;
Enable module, for making manual control module or automatic control module work based on the mode control signal of described second load module access.
Preferably, described parametric controller at least also comprises:
Suspend module, for making described manual control module or automatic control module suspend based on the halt signal of the second load module access.
Preferably, described parametric controller at least also comprises:
Turning off module, for occurring extremely providing cut-off signals to output module based on the relevant information of described diesel engine to be measured, closing to make EGR valve.
As mentioned above, the Auto-Test System for determining lift of EGR valve of the present invention, has following beneficial effect: can realize the control to EGR valve aperture, automatically can complete the demarcation of lift of EGR valve.
Accompanying drawing explanation
Fig. 1 is shown as the Auto-Test System schematic diagram for determining lift of EGR valve of the present invention.
Fig. 2 is shown as the diesel engine schematic diagram to be measured of the Auto-Test System for determining lift of EGR valve of the present invention.
Fig. 3 is shown as the parametric controller schematic diagram of the Auto-Test System for determining lift of EGR valve of the present invention.
Fig. 4 is shown as lift of EGR valve and the time relationship schematic diagram of the Auto-Test System for determining lift of EGR valve of the present invention.
Element numbers explanation
1 Auto-Test System
11 engine test tables
111 active dynamometer machines
112 toxic emission measuring and analysing meters
113 diesel engines to be measured
12 parametric controller
121 first load modules
122 stable conditions determination modules
123 automatic control modules
124 output modules
125 second load modules
126 manual control module
127 enable module
128 suspend module
129 turn off module
13 determination modules
2 host computers
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to Fig. 1 to Fig. 4.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in Figure 1, the invention provides a kind of Auto-Test System for determining lift of EGR valve.This Auto-Test System 1 at least comprises: engine test table 11, parametric controller 12 and determination module 13.
Described engine test table 11 is equipped with initiatively dynamometer machine 111 and toxic emission measuring and analysing meter 112.
Wherein, described active dynamometer machine 111 is for controlling the operating mode of the diesel engine to be measured 113 be arranged on described engine test table 11, and the parameter such as oil consumption, power of diesel engine to be measured 113 under recording each operating mode when each lift of EGR valve of described diesel engine 113 to be measured; Smoke intensity, NOx concentration and HC concentration etc. that when described toxic emission measuring and analysing meter 112 is for recording different lift of EGR valve under each operating mode, diesel engine 113 to be measured discharges.
Such as, described active dynamometer machine 111 controls the operating mode of described diesel engine to be measured 113 by rotating speed SPD, the rate of load condensate LOAD etc. adjusting diesel engine 113 to be measured.
Described diesel engine to be measured 113 comprises the diesel engine that any one is configured with EGR valve, preferably, includes but not limited to turbo-charged diesel etc.Such as, be configured with the diesel engine of supercharger, EGR valve and solenoid valve, wherein, EGR valve two ends are connected (or also can be connected supercharger exhaust end and turbine inflow end) with the intake and exhaust end of diesel engine respectively, solenoid valve connects EGR valve outlet and diesel engine intake end, as shown in Figure 2.
Described parametric controller 12, for after stable under being arranged on the operating mode that the diesel engine to be measured 113 on described engine test table 11 controls at described active dynamometer machine 111, adjusts the lift of the EGR valve of described diesel engine to be measured 113 to control described EGR valve based on pre-defined rule.
Described pre-defined rule comprises any rule relevant to the lift of adjustment diesel engine EGR valve, preferably, includes but not limited to: manual adjustments, regulate etc. with predetermined step-length in preset range.
Described determination module 13 is for determining the best lift of EGR valve under this operating mode in the information that each lift of EGR valve gathers according to described active dynamometer machine 111 and toxic emission measuring and analysing meter 112.
Particularly, described determination module 13 is to minimize NOx emission for target, and oil consumption, delivery temperature, cooling water temperature are that restrictive condition is to determine the optimization method of optimum EGR lift.
As a kind of optimal way, described parametric controller 12 at least comprises: the first load module 121, stable conditions determination module 122, automatic control module 123 and output module 124, as shown in Figure 3.
Described first load module 121 is for obtaining the relevant information of described diesel engine to be measured 113.Preferably, for obtaining pressure BTP etc. before pressure ACP after rotating speed SPD, the torque T Q of described diesel engine to be measured 113, coolant water temperature CWT, rate of load condensate LOAD, supercharger, supercharger.
Preferably, described first load module 121 to be connected with the electronic control unit (ECU) of described diesel engine 113 to be measured the relevant information fetching and obtain described diesel engine to be measured 113 by CAN.
Based on the repeatedly relevant information of described diesel engine 113 to be measured, described stable conditions determination module 122 is for judging whether the operating mode of described diesel engine to be measured 113 is stablized.
Such as, the torque value TQ that current first load module 121 provides by described stable conditions determination module 122 and the torque value TQ of front 3 sampling interval, the torque value TQ of 6 sampling interval ... subtract each other respectively Deng 5 torque values and take absolute value, in the absolute value of these 5 groups of differences, there are at least 2 groups to be greater than 5, then judge that torque T Q stablizes, based on the same or analogous judgment mode of the judgment mode whether aforementioned torques is stable, described stable conditions determination module 122 judges whether rotating speed SPD stablizes, and is no longer described in detail at this.
It should be noted that, it should be appreciated by those skilled in the art that the above-mentioned judgment mode judging that whether operating mode is stable only just lists, but not limitation of the present invention, in fact, any energy judge the mode whether diesel engine condition to be measured is stable, all within the scope of the present invention.
Described automatic control module 123, for after stable under the operating mode that controls at described active dynamometer machine 111 when described diesel engine 113 to be measured, adjusts the lift of the EGR valve of described diesel engine to be measured 113 in preset range based on predetermined step-length.
Particularly, the rotating speed SPD that described automatic control module 123 provides based on described first load module 121 and rate of load condensate LOAD finds corresponding initial lift of EGR valve BASEEVL from the initial EGR valve arteries and veins spectrogram prestored, with predetermined step-length (the total lift of such as EGR valve 5% for step-length), the lift adjusting EGR valve with predetermined lift scope (such as, the total lift of EGR valve ± 20% be increment variation range) on the basis of this initial lift of EGR valve BASEEVL.
Wherein, initial EGR valve arteries and veins spectrogram be one with rotating speed SPD, rate of load condensate LOAD for input two-dimentional arteries and veins spectrogram, it can be obtained by simulation calculation in advance.
Described output module 124 exports corresponding EGR valve control signal based on the lift of described EGR valve and controls described EGR valve.
Particularly, the lift of EGR valve is converted to the pwm signal that can change EGR valve aperture by described output module 124, when diesel engine 113 to be measured is also configured with solenoid valve, then the 0/5V step signal that the lift of EGR valve is also converted to solenoid valve opening and closing by described output module 124 carrys out Controlling solenoid valve.
As another optimal way, described parametric controller 12 also can comprise: the second load module 125, manual control module 126 and enable module 127, as shown in Figure 3.
Described second load module 125 is for access module control signal and lift of EGR valve information.
Preferably, described second load module 125 is connected with access module control signal by CAN with external unit, wherein, described external unit comprises the equipment of any control signal etc. that can supply a pattern, and preferably, includes but not limited to computing machine, such as, the host computer 2 etc. shown in Fig. 2.
Preferably, described second load module 125 is by the lift of EGR valve information of analog signal interface on-position sensor sensing or the pwm signal by analog signal interface access expression lift of EGR valve information.
Described manual control module 126 is supplied to described output module 124, so that described output module 124 controls described EGR valve etc. based on this lift of EGR valve for the lift of the EGR valve accessed by described second load module 125.
Described enable module 127 makes manual control module 126 or automatic control module 123 work for the mode control signal accessed based on described second load module 125.
Particularly, during the mode control signal MODE=1 that described second load module 125 accesses, described enable module 127 makes manual control module 126 work, and the lift by the EGR valve of described second load module 125 access is directly supplied to described output module 124; If during the mode control signal MODE=0 that described second load module 125 accesses, described enable module 127 makes automatic control module 123 work, and namely adjusts the lift with the EGR valve of described diesel engine 113 to be measured based on predetermined step-length in preset range.
As another optimal way, described parametric controller 12 also can comprise: suspend module 128, as shown in Figure 3.
Described time-out module 128 makes described manual control module 126 or automatic control module 123 suspend for the halt signal accessed based on the second load module 125.
Preferably, the second load module 125 to be connected with external unit by CAN and to access halt signal.
It should be noted that, be simplicity of illustration, and the line suspended in Fig. 2 between module 128 and automatic control module 123 is not shown.
As another optimal way, described parametric controller 12 also can comprise: turn off module 129, as shown in Figure 3.
Thering is provided cut-off signals to output module 124 when described shutoff module 129 is for occurring abnormal based on the relevant information of described diesel engine 113 to be measured, closing to make EGR valve.
Preferably, described shutoff module 129 also passes through output module 124 output alarm signal to external unit.
Such as, when when having one in rotating speed SPD, rate of load condensate LOAD and cooling water temperature CWT not in preset range or after supercharger, pressure ACP being greater than pressure BTP before turbine, then described shutoff module 129 provides cut-off signals to come shut electromagnetic valve and EGR valve to output module 124.
Below for total lift of EGR valve for 100mm, the course of work of above-mentioned Auto-Test System 1 is described in detail in detail, as shown in Figure 4:
Stage 1, time time TIME=0 minute (min), turn off the rotating speed SPD that module 129 provides based on the first load module 121, the parameters such as rate of load condensate LOAD and coolant water temperature CWT judge that exception does not appear in diesel engine 113 to be measured, and based on those parameters, stable conditions determination module 122 judges that diesel engine 113 to be measured is stable, and the mode control signal that the second load module 125 exports makes enable module 127 start automatic control module 123 to work, then automatic control module 123 is according to current rotating speed SPD, rate of load condensate LOAD, the initial EGR lift BASEEVL found now by initial EGR lift arteries and veins spectrogram (BASEMAP) should be 65mm, then automatic control module 123 control EGR lift EVL is from 50mm (the total lift * 20%+1 of BASEEVL-step-length=65-100*20%+5=50), within every 5 minutes, lift increases 5mm, be terminate in 80mm (the total lift * 20%-1 step-length 65+100*20%-5=80 of BASEEVL+) time to lift.
When the stage 2, TIME=35min, the process of automatic control module 123 duplication stages 1.
When the stage 3, TIME=45min, the second load module 125 exports halt signal, therefore time-out module 128 makes automatic control module 123 suspend, and now initial EGR lift BASEEVL and EGR lift EVL keeps the value at the end of the stage 2.
Stage 4, during TIME=60min, initiatively dynamometer machine adjusts rotating speed SPD and the rate of load condensate LOAD of diesel engine 113 to be measured, then turn off module 129 based on the rotating speed SPD after adjustment, rate of load condensate LOAD judges diesel engine to be measured 113 whether, after then based on those parameters, stable conditions determination module 122 judges that diesel engine 113 to be measured is stable if not, automatic control module 123 is according to rotating speed SPD after adjustment, rate of load condensate LOAD, initial EGR lift BASEEVL is now found by initial EGR lift arteries and veins spectrogram (BASEMAP), and determine the setting range of EGR lift EVL, as as shown in the stage 1, mode regulates lift.
When the stage 5, TIME=100min, turn off module 129 abnormal based on the relevant information appearance of described diesel engine 113 to be measured, make output module 124 turn off EGR valve, now initial EGR lift BASEEVL and EGR lift EVL is set to 0.
After test terminates, determination module 13 determines the lift of EGR valve of the best under this operating mode according to the smoke intensity of lift of EGR valve different under certain operating mode, NOx, oil consumption, delivery temperature, cooling water temperature.Determine that the optimization method of this optimum EGR lift is to minimize NOx emission for target, oil consumption, delivery temperature, cooling water temperature are restrictive condition.
In sum, Auto-Test System for determining lift of EGR valve of the present invention can according to test request to adjust the aperture of EGR valve, realize the control to EGR valve, and the automatical and efficient demarcation engineering completing EGR lift arteries and veins spectrogram of energy, a large amount of human and material resources and financial resources can be saved for R&D process; In addition, when meeting accident, energy quick closedown EGR valve, can switch to manual control pattern when there being specific demand.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (7)
1., for determining an Auto-Test System for lift of EGR valve, it is characterized in that, described for determining that the Auto-Test System of lift of EGR valve at least comprises:
The engine test table of initiatively dynamometer machine and toxic emission measuring and analysing meter is equipped with;
Parametric controller, for when be arranged on the diesel engine to be measured on described engine test table stable under the operating mode of described active Dynamometer Control after, adjust the lift of the EGR valve of described diesel engine to be measured based on pre-defined rule to control described EGR valve;
Determination module, for determining the best lift of EGR valve under this operating mode in the information that each lift of EGR valve gathers according to described active dynamometer machine and toxic emission measuring and analysing meter;
Described parametric controller at least comprises:
First load module, for obtaining the relevant information of described diesel engine to be measured;
Based on the repeatedly relevant information of described diesel engine to be measured, stable conditions determination module, for judging whether the operating mode of described diesel engine to be measured is stablized;
Automatic control module, for after described diesel engine to be measured is stable under the operating mode of described active Dynamometer Control, adjusts the lift of the EGR valve of described diesel engine to be measured in preset range based on predetermined step-length;
Output module, the lift based on described EGR valve exports corresponding EGR valve control signal and controls described EGR valve.
2. the Auto-Test System for determining lift of EGR valve according to claim 1, is characterized in that: described first load module to be connected with the electronic control unit of described diesel engine to be measured the relevant information fetching and obtain described diesel engine to be measured by CAN.
3. the Auto-Test System for determining lift of EGR valve according to claim 1, is characterized in that: described parametric controller at least also comprises:
Second load module, for access module control signal and lift of EGR valve information;
Manual control module, the lift for the EGR valve by described second load module access is supplied to described output module;
Enable module, for making manual control module or automatic control module work based on the mode control signal of described second load module access.
4. the Auto-Test System for determining lift of EGR valve according to claim 3, is characterized in that described parametric controller at least also comprises:
Suspend module, for making described manual control module or automatic control module suspend based on the halt signal of the second load module access.
5. the Auto-Test System for determining lift of EGR valve according to claim 3, is characterized in that: described second load module is connected to access associated control signal by CAN with external unit.
6. the Auto-Test System for determining lift of EGR valve according to claim 2, is characterized in that described parametric controller at least also comprises:
Turning off module, for occurring extremely providing cut-off signals to output module based on the relevant information of described diesel engine to be measured, closing to make EGR valve.
7. the Auto-Test System for determining lift of EGR valve according to claim 1, is characterized in that: described diesel engine to be measured comprises turbo-charged diesel.
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| CN103913308A (en) * | 2014-04-25 | 2014-07-09 | 无锡隆盛科技股份有限公司 | Method for detecting response time of position feedback type EGR valve |
| CN106017968A (en) * | 2016-07-29 | 2016-10-12 | 无锡隆盛科技股份有限公司 | EGR cooler heat exchange efficiency detection system |
| CN106017910A (en) * | 2016-07-29 | 2016-10-12 | 无锡隆盛科技股份有限公司 | EGR valve flow testing system |
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Effective date of registration: 20190329 Address after: 214174 Standard Workshop No. 8 Changhui Road, Wind Power Park, Huishan Economic Development Zone, Wuxi City, Jiangsu Province Patentee after: Wuxi Tongyi Automotive Power Technology Co., Ltd. Address before: No. 1239, Siping Road, Yangpu District, Shanghai Patentee before: Tongji University |