CN102975766B - Electric hydraulic power-assisted steering system failure diagnosing method and controller - Google Patents

Electric hydraulic power-assisted steering system failure diagnosing method and controller Download PDF

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Publication number
CN102975766B
CN102975766B CN201210536562.9A CN201210536562A CN102975766B CN 102975766 B CN102975766 B CN 102975766B CN 201210536562 A CN201210536562 A CN 201210536562A CN 102975766 B CN102975766 B CN 102975766B
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assisted steering
oil
hydraulic power
electric
electric hydraulic
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CN102975766A (en
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韩尔樑
赵强
潘凤文
李会收
刘焕东
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Abstract

The invention discloses an electric hydraulic power-assisted steering system failure diagnosing method and a controller. The method comprises the following steps of receiving working parameters of an electric hydraulic power-assisted steering system, which are acquired at the moment, wherein the working parameters comprise voltage and current of the two ends of a motor, the opening degree of a hydraulic oil distributing valve, a management signal of a high-pressure management unit, the oil amount of an oil storage tank, oil pressure between an electric hydraulic power-assisted steering oil pump and the hydraulic oil distributing valve, and hydraulic oil flow rate between the hydraulic oil distributing valve and a steering executing unit; and analyzing the type of a failure of a part of an electric hydraulic power-assisted steering system according to the working parameters. Which part fails is determined by analyzing the received working parameters, so that an automatic failure diagnosing function of the electric hydraulic power-assisted steering system is realized.

Description

A kind of electric hydraulic power-assisted steering system method for diagnosing faults and controller
Technical field
The present invention relates to automatic control technology, particularly relate to a kind of electric hydraulic power-assisted steering system method for diagnosing faults and controller.
Background technology
Shown in figure 1, for the electric hydraulic power-assisted steering system structural representation in automobile, described electric hydraulic power-assisted steering system generally comprises petrol storage tank, electric power steering oil pump, hydraulic oil distribution valve, turns to performance element, hydraulic oil pipeline and high-tension distribution box, wherein, described electric power steering oil pump comprises motor and hydraulic booster pump.
The principle of work of electric hydraulic power-assisted steering system is: when automobile by on-electric patten transformation to electric model time, entire car controller transmits control signal to the high pressure administrative unit in high-tension distribution box, the power connection of high pressure management unit controls electric hydraulic power-assisted steering system, be that electric power steering pump in electric hydraulic power-assisted steering system is powered by configuration high-tension distribution box, after the energising of electric power steering pump, machine operation then in described electric power steering pump, and drive hydraulic booster pump by the hydraulic oil in petrol storage tank with certain pressure press-in hydraulic oil pipeline, in figure by black add thick line mark be hydraulic oil pipeline, if now bearing circle does not rotate, the flow direction of described hydraulic oil in hydraulic oil pipeline is 1 loop of solid line mark in Fig. 1, if rotating of steering wheel, then the flow direction of hydraulic oil in hydraulic oil pipeline is 2 loops of dotted line mark in Fig. 1.
When automobile normally runs, electric hydraulic power-assisted steering system controls the rotation of car load bearing circle by above-mentioned principle of work, but contriver finds in research process, electric hydraulic power-assisted steering system technical scheme whether working properly is not monitored in prior art, if electric hydraulic power-assisted steering system et out of order, then can not accurately realize the rotation of bearing circle, such as, may occur the problem that rotating of steering wheel angle is excessive, this will bring hidden danger to the driving safety of chaufeur.
Summary of the invention
The invention provides a kind of electric hydraulic power-assisted steering system method for diagnosing faults and controller, the technical matters of selfdiagnosis cannot be carried out to the fault of generation itself to solve electric hydraulic power-assisted steering system in prior art.
For solving the problems of the technologies described above, the invention provides a kind of electric hydraulic power-assisted steering system method for diagnosing faults and controller, the invention provides following technical scheme:
A kind of electric hydraulic power-assisted steering system method for diagnosing faults, the method comprises:
Be received in the working parameter of electric hydraulic power-assisted steering system that current time gathers, described working parameter comprises the voltage and current at motor two ends, the valve opening of hydraulic oil distribution valve, the management signal of high pressure administrative unit, the oil mass of petrol storage tank, oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turns to the hydraulic fluid flow rate between performance element;
According to the fault type that the parts of described operation parameters analysis electric hydraulic power-assisted steering system occur.
Preferably, the fault type that the described parts according to described operation parameters analysis electric hydraulic power-assisted steering system occur, comprising:
Judge whether described working parameter meets the condition of motor open failure, the condition of described motor open failure is: the voltage at described motor two ends is non-vanishing and the electric current of motor is zero, if meet, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that motor disconnects.
Preferably, the fault type that the described parts according to described operation parameters analysis electric hydraulic power-assisted steering system occur, comprising:
Judge whether described working parameter meets the condition of high pressure administrative unit CAN communication failure, the condition of described high pressure administrative unit CAN communication failure is: the valve opening of hydraulic oil distribution valve is non-vanishing and the management signal of high pressure administrative unit is zero, if meet, then determine that the fault type that electric hydraulic power-assisted steering system occurs is high pressure administrative unit CAN communication failure.
Preferably, the fault type that the described parts according to described operation parameters analysis electric hydraulic power-assisted steering system occur, comprising:
Judge whether described working parameter meets the condition of branch road or relay fault, the condition of described branch road or relay fault is: the management signal of described high pressure administrative unit is non-vanishing and the voltage at motor two ends is zero, if meet, then determine that the fault type that electric hydraulic power-assisted steering system occurs is branch road or relay fault.
Preferably, the fault type that the described parts according to described operation parameters analysis electric hydraulic power-assisted steering system occur, comprising:
The oil mass of described petrol storage tank is converted into percentages;
Judge whether described percentages is less than predetermined threshold value, if so, then determine that fault type that electric hydraulic power-assisted steering system occurs is that the oil mass of petrol storage tank is few.
Preferably, the fault type that the described parts according to described operation parameters analysis electric hydraulic power-assisted steering system occur, comprising:
Search in the matching relationship figure prestored identical with the oil pressure between electric power steering oil pump and hydraulic oil distribution valve with the valve opening of the hydraulic oil distribution valve in described working parameter or in default error limit immediate target oil pressure and target valve aperture;
If find, then by the hydraulic oil distribution valve corresponded in the target flow of described target oil pressure and target valve aperture and described working parameter and turn to the hydraulic fluid flow rate between performance element to subtract each other, to obtain difference;
Judge whether described difference exceeds default error burst, if exceed, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
Preferably, describedly judge whether described difference exceeds default error burst, if exceed, then determine fault type that electric hydraulic power-assisted steering system occurs be oil circuit abnormal after, also comprise:
Judge hydraulic oil distribution valve and turn to the hydraulic fluid flow rate between performance element whether to be greater than described target oil mass, if be greater than, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is larger;
If be less than, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is less.
Preferably, described method also comprises:
Integral operation is carried out to the voltage and current at motor two ends, obtains the consumption of current of described electric hydraulic power-assisted steering system in Preset Time, to estimate car load consumption of current.
The present invention also provides a kind of controller, and described controller comprises:
Receiving element, for being received in the working parameter of electric hydraulic power-assisted steering system that current time gathers, described working parameter comprises the voltage and current at motor two ends, the valve opening of hydraulic oil distribution valve, the management signal of high pressure administrative unit, the oil mass of petrol storage tank, oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turns to the hydraulic fluid flow rate between performance element;
Analytic unit, for the fault type occurred according to the parts of described operation parameters analysis electric hydraulic power-assisted steering system.
Preferably, if there is motor open failure, described analytic unit specifically comprises:
First judgment sub-unit, for judging whether described working parameter meets the condition of motor open failure, the condition of described motor open failure is: the voltage at described motor two ends is non-vanishing and the electric current of motor is zero;
First determines subelement, when meeting the condition of motor open failure for described working parameter, determines that the fault type that electric hydraulic power-assisted steering system occurs is that motor disconnects.
Preferably, if there is high pressure administrative unit CAN communication failure, described analytic unit specifically comprises:
Second judgment sub-unit, for judging whether described working parameter meets the condition of high pressure administrative unit CAN communication failure, the condition of described high pressure administrative unit CAN communication failure is: the valve opening of hydraulic oil distribution valve is non-vanishing and the management signal of high pressure administrative unit is zero;
Second determines subelement, when whether meeting the condition of high pressure administrative unit CAN communication failure for described working parameter, determines that the fault type that electric hydraulic power-assisted steering system occurs is high pressure administrative unit CAN communication failure.
Preferably, if there is branch road or relay fault, then described analytic unit specifically comprises:
3rd judgment sub-unit, for judging whether described working parameter meets the condition of branch road or relay fault, the condition of described branch road or relay fault is: the management signal of described high pressure administrative unit is non-vanishing and the voltage at motor two ends is zero;
3rd determines subelement, when whether meeting the condition of branch road or relay fault for described working parameter, determines that the fault type that electric hydraulic power-assisted steering system occurs is branch road or relay fault.
Preferably, if the few fault of the oil mass that petrol storage tank occurs, then described analytic unit specifically comprises:
Conversion subelement, for being converted into percentages by the oil mass of described petrol storage tank;
4th judgment sub-unit, for judging whether described percentages is less than predetermined threshold value;
4th determines subelement, when being less than predetermined threshold value for described percentages, determines that fault type that electric hydraulic power-assisted steering system occurs is that the oil mass of petrol storage tank is few.
Preferably, if there is oil circuit abnormal failure, then described analytic unit specifically comprises:
Search subelement, for search in the matching relationship figure prestored identical with the oil pressure between electric power steering oil pump and hydraulic oil distribution valve with the valve opening of the hydraulic oil distribution valve in described working parameter or in default error limit immediate target oil pressure and target valve aperture;
Computation subunit, for when finding target oil pressure and target valve aperture, by the hydraulic oil distribution valve corresponded in the target flow of described target oil pressure and target valve aperture and described working parameter and turn to the hydraulic fluid flow rate between performance element to subtract each other, to obtain difference;
5th judgment sub-unit, for judging whether described difference exceeds default error burst;
5th determines subelement, when exceeding default error burst for described difference, determines that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
Preferably, described analytic unit also comprises:
6th judgment sub-unit, for judging hydraulic oil distribution valve and turning to the hydraulic fluid flow rate between performance element whether to be greater than described target oil mass;
6th determines subelement, for hydraulic oil distribution valve and when turning to the hydraulic fluid flow rate between performance element to be greater than described target oil mass, determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is larger, at hydraulic oil distribution valve and when turning to the hydraulic fluid flow rate between performance element to be less than described target oil mass, determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is less.
Preferably, described controller also comprises:
Integral arithmetic unit, for carrying out integral operation to the voltage and current at motor two ends, obtains the consumption of current of described electric hydraulic power-assisted steering system in Preset Time, to estimate car load consumption of current.
In technical scheme of the present invention, under the current time gathered by reception, the working parameter of electric hydraulic power-assisted steering system, and described working parameter is made a concrete analysis of thus determines the fault type that the parts of electric hydraulic power-assisted steering system occur, thus achieve electric hydraulic power-assisted steering system fault self-diagnosis function.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electric hydraulic power-assisted steering system structural representation of automobile in prior art;
Fig. 2 is the diagram of circuit of a kind of electric hydraulic power-assisted steering system method for diagnosing faults of the present invention embodiment 1;
Fig. 3 is the diagram of circuit of a kind of electric hydraulic power-assisted steering system method for diagnosing faults of the present invention embodiment 2;
Fig. 4 is a kind of controller architecture schematic diagram of the present invention;
Fig. 5 is the structural representation of the controller that the present invention includes analytic unit structural representation;
Fig. 6 is the another kind of structural representation of a kind of controller of the present invention.
Detailed description of the invention
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, technical scheme of the present invention is when electric hydraulic power-assisted steering system normally runs, the real-time analysis of real-time monitoring to the operation of electric hydraulic power-assisted steering system or data can be realized, when the component malfunction of electric hydraulic power-assisted steering system, can by the working parameter that gathers to the diagnosing malfunction occurred, to avoid the generation of the accident caused because of electric hydraulic power-assisted steering system et out of order.
Shown in figure 2, be the diagram of circuit of a kind of electric hydraulic power-assisted steering system method for diagnosing faults embodiment 1 provided by the invention, the present embodiment specifically can comprise:
Step 201: the working parameter being received in the electric hydraulic power-assisted steering system that current time gathers.
In automobile normal running process, if automobile by on-electric patten transformation to electric model, just can carry out the Real-Time Monitoring of electric boosting steering system.Under electric model, preferably, sensor can be adopted to gather the working parameter of current time electric hydraulic power-assisted steering system, and the concrete working parameter gathered can comprise: the management signal of the voltage and current at motor two ends, the valve opening of hydraulic oil distribution valve, high pressure administrative unit, the oil mass of petrol storage tank, oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turn to hydraulic fluid flow rate between performance element.
Wherein the management signal of high pressure administrative unit can be the set of multiple signal or state, and described management signal can be an actual numerical value, such as can represent the size of a voltage, also can be the state represented by or multidigit two scale notation or hexadecimal numeral, such as, " 1 " can be set to by a certain position in management signal and represent that branch road is connected, represent that branch road disconnects with " 0 ", in like manner, the not coordination in described management signal can be used for identifying the mode of operation of different parts.The management signal of the working parameter enumerated in step 201 described herein and high pressure administrative unit is wherein only help the understanding to the present embodiment; limiting the scope of the present invention can not be regarded as; because in actual applications; can be according to actual needs; different working parameters is gathered by sensor; for different faults, different high pressure management Single Component Management signals also can be gathered.
Step 202: the fault type occurred according to the parts of described operation parameters analysis electric hydraulic power-assisted steering system.
After getting the working parameter of described electric hydraulic power-assisted steering system at current time, the fault type that the parts just can analyzing electric hydraulic power-assisted steering system according to described working parameter occur; Wherein said fault type specifically comprises: the oil mass of motor open failure, high pressure administrative unit CAN communication failure, branch road or relay fault, petrol storage tank is few, oil circuit abnormal; described several fault types are to make an explanation to the present embodiment, but it can not regard limiting the scope of the present invention as.
The concrete analysis process of described several fault types is as follows:
1), in the working parameter obtained, the voltage at motor two ends and the electric current of motor is extracted, if the voltage at described motor two ends is non-vanishing and the electric current of motor is zero, then illustrate that described motor is energized, then can determine that the fault type that electric hydraulic power-assisted steering system occurs is that motor disconnects.
2), the valve opening of extract force feed distributing valve and the management signal of high pressure administrative unit in the working parameter obtained, if the valve opening of hydraulic oil distribution valve is non-vanishing, namely direction dish there occurs rotation, now automobile is in electric model, entire car controller transmits control signal to high pressure administrative unit, control it and enter mode of operation, if now the management signal of high pressure administrative unit is zero, illustrate that high pressure administrative unit CAN does not receive described control signal, then determine that the fault type that electric hydraulic power-assisted steering system occurs is high pressure administrative unit CAN communication failure.
3), in the working parameter obtained, the management signal of high pressure administrative unit and the voltage at motor two ends is extracted, if the management signal of high pressure administrative unit is non-vanishing, illustrate that high pressure administrative unit works, described high pressure administrative unit will control the power connection of electric hydraulic power-assisted steering system, if the voltage at the motor two ends now gathered is zero, then illustrate that the branch road of high-tension distribution box and motor is not connected, so, just can determine that the fault type that electric hydraulic power-assisted steering system occurs is branch road or relay fault.
4), in the working parameter obtained extract the oil mass of petrol storage tank, after extraction, the oil mass of described petrol storage tank being converted into percentages, here, when converting, is using the maximum oil reserve of petrol storage tank as conversion foundation.In actual applications, the minimum oil reserve percentum that a threshold value is used for representing that automobile can normally run can be preset, so, after the oil mass of described petrol storage tank is converted into percentages, just the percentages of conversion and described default threshold value can be compared, if the percentages converted is less than predetermined threshold value, just can determine that fault type that electric hydraulic power-assisted steering system occurs is that the oil mass of petrol storage tank is few, because oil reserve is few, so described hydraulic oil just can not provide enough power to rotate to drive bearing circle.
5), the valve opening of extract force feed distributing valve and the oil pressure between electric power steering oil pump and hydraulic oil distribution valve in the working parameter obtained, then in the matching relationship figure prestored, search target oil pressure and target valve aperture, described target oil pressure and target valve aperture refer to identical with the oil pressure between electric power steering oil pump and hydraulic oil distribution valve with the valve opening of the hydraulic oil distribution valve in described working parameter or immediate in default error limit.After finding, by the hydraulic oil distribution valve corresponded in the target flow of described target oil pressure and target valve aperture and described working parameter and turn to the hydraulic fluid flow rate between performance element to subtract each other, obtain a difference, be designated as the first difference, then just can judge whether described first difference exceeds first and preset error burst, if exceeded, just can determine that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
Be understandable that, in the illustrating of the above-mentioned diagnostic procedure to several fault, label 1)-5) not representing fault diagnosis time sequencing, the just mark of difference different faults diagnostic mode.
In like manner, also can the valve opening of extract force feed distributing valve and hydraulic oil distribution valve and turn to hydraulic fluid flow rate between performance element in the working parameter obtained, then in the matching relationship figure prestored, search target oil mass and target valve aperture.After finding, oil pressure between the electric power steering oil pump corresponded in the target oil pressure of described target oil mass and target valve aperture and described working parameter and hydraulic oil distribution valve is subtracted each other, also a difference can be obtained, be designated as the second difference, then judge whether described second difference exceeds second and preset error burst, if exceeded, just can determine that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal;
In like manner, also can extract force feed distributing valve and turn to the hydraulic fluid flow rate between performance element and the oil pressure between electric power steering oil pump and hydraulic oil distribution valve in the working parameter obtained, in the matching relationship figure prestored, search target oil pressure and target oil mass; After finding, the target valve aperture corresponding to described target oil pressure and target oil mass is subtracted each other, also can obtain a difference, be designated as the 3rd difference; After obtaining the 3rd difference, just can judge whether described 3rd difference exceeds the 3rd and preset error burst, if exceeded, just can determine that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
The situation that three kinds can be determined electric hydraulic power-assisted steering system generation oil circuit abnormal failure is given in the present embodiment, wherein, the matching relationship figure prestored used in these three kinds of methods can be a graphics, also can be a form preserving data, its concrete form be not construed as limiting here.What identify in described matching relationship figure is the valve opening according to test of many times or the hydraulic oil distribution valve that obtained by empirical value, the oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turn to a quantitative relation between this three of the hydraulic fluid flow rate between performance element, described relation refers to when electric hydraulic power-assisted steering system normally works, the numerical relation between described three working parameters.
In the technical scheme of the present embodiment, under the current time gathered by reception, the working parameter of electric hydraulic power-assisted steering system, and described working parameter is made a concrete analysis of thus determines the fault type that the parts of electric hydraulic power-assisted steering system occur, achieve the function of electric hydraulic power-assisted steering system fault self-diagnosis.
Shown in figure 3, be the diagram of circuit of a kind of electric hydraulic power-assisted steering system method for diagnosing faults embodiment 2 provided by the invention, the present embodiment can be regarded as a specific implementation of embodiment 1, and the present embodiment specifically comprises:
Step 301: sensor gathers the working parameter of current time electric hydraulic power-assisted steering system.
Step 302: described working parameter is sent to controller.
Step 303: the fault type that described controller occurs according to the parts of the operation parameters analysis electric hydraulic power-assisted steering system received.
The realization of step 301-step 303 can step 201-step 202 in embodiment 1 similar, repeat no more herein.
It should be noted that, in step 202 in embodiment 1, when determining described electric boosting steering system generation oil circuit abnormal failure, further can also determine that the oil circuit what reason causes is abnormal, situation is judged for the first description oil circuit abnormal failure in the step 202 in embodiment 1, described step 303 will concrete analysis its cause reason of oil circuit exception.
The first description oil circuit abnormal failure in step 202 in embodiment 1 is judged situation, after determining electric hydraulic power-assisted steering system generation oil circuit and be abnormal, further can judge hydraulic oil distribution valve and turn to the hydraulic fluid flow rate between performance element whether to be greater than the target oil mass found, if be greater than, the reason just can determining to cause electric hydraulic power-assisted steering system that oil circuit abnormal failure occurs is that the valve opening of hydraulic oil distribution valve is larger; Otherwise the reason just can determining to cause electric hydraulic power-assisted steering system that oil circuit abnormal failure occurs is that the valve opening of hydraulic oil distribution valve is less.
Step 304: have fault to occur to alert personnel's prompting.
After determining electric hydraulic power-assisted steering system et out of order, fault can be had to occur to staff's prompting by alarm lamp or the form of blowing a whistle.
Step 305: the fault type determined is shown by telltale by controller.
After determining electric hydraulic power-assisted steering system et out of order, the fault type determined can be shown to staff by telltale, be convenient to staff and know which kind of fault electric hydraulic power-assisted steering system there occurs, so that staff implements to keep in repair targetedly to electric hydraulic power-assisted steering system.
Step 306: carry out integral operation to the voltage and current at motor two ends, obtains the consumption of current of described electric hydraulic power-assisted steering system in Preset Time.
Described controller is after the working parameter obtaining electric hydraulic power-assisted steering system, integral operation can be carried out to the voltage and current at motor two ends, obtain the car load consumption of current in Preset Time, so that the power consumption performance of staff to car load has one reasonably to evaluate.
Wherein, in the present embodiment, warning function and Presentation Function all can be integrated in described controller inside, also can independent of controller, and the sequencing of warning and function is also not specifically limited.Enforcement for described step 306 not necessarily will after step 305, as long as implement after the working parameter obtaining current time electric hydraulic power-assisted steering system.
The technical scheme of the present embodiment not only can realize the beneficial effect that the technical scheme in embodiment 1 is brought, further, after determining the fault type that electric hydraulic power-assisted steering system occurs, in the present embodiment, by alarm lamp, the fault type of described generation can also be prompted to chaufeur, such chaufeur just can make corresponding action for fault alarm, such as brakes, the accident caused to avoid the fault because electric hydraulic power-assisted steering system occurs in time; In addition, maintainer can determine the concrete fault occurred by the display of telltale, can keep in repair targetedly, saved the time of failture evacuation and maintenance, saved labour cost electric hydraulic power-assisted steering system, improves maintenance efficiency.
Accordingly, the present invention also provides a kind of controller, and shown in figure 4, be the structural representation of a kind of controller provided by the invention, described controller can comprise:
Receiving element 401, for being received in the working parameter of electric hydraulic power-assisted steering system that current time gathers, described working parameter comprises the voltage and current at motor two ends, the valve opening of hydraulic oil distribution valve, the management signal of high pressure administrative unit, the oil mass of petrol storage tank, oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turns to the hydraulic fluid flow rate between performance element;
Analytic unit 402, for the fault type occurred according to the parts of described operation parameters analysis electric hydraulic power-assisted steering system.
Preferably, shown in figure 5, be the structural representation of the controller of the structural representation comprising analytic unit 402, wherein, described analytic unit 402 specifically comprises:
First judgment sub-unit 501, for judging whether described working parameter meets the condition of motor open failure, the condition of described motor open failure is: the voltage at described motor two ends is non-vanishing and the electric current of motor is zero;
First determines subelement 502, when meeting the condition of motor open failure for described working parameter, determines that the fault type that electric hydraulic power-assisted steering system occurs is that motor disconnects.
Second judgment sub-unit 503, for judging whether described working parameter meets the condition of high pressure administrative unit CAN communication failure, the condition of described high pressure administrative unit CAN communication failure is: the valve opening of hydraulic oil distribution valve is non-vanishing and the management signal of high pressure administrative unit is zero;
Second determines subelement 504, when whether meeting the condition of high pressure administrative unit CAN communication failure for described working parameter, determines that the fault type that electric hydraulic power-assisted steering system occurs is high pressure administrative unit CAN communication failure.
3rd judgment sub-unit 505, for judging whether described working parameter meets the condition of branch road or relay fault, the condition of described branch road or relay fault is: the management signal of described high pressure administrative unit is non-vanishing and the voltage at motor two ends is zero;
3rd determines subelement 506, when whether meeting the condition of branch road or relay fault for described working parameter, determines that the fault type that electric hydraulic power-assisted steering system occurs is branch road or relay fault.
Conversion subelement 507, for being converted into percentages by the oil mass of described petrol storage tank;
4th judgment sub-unit 508, for judging whether described percentages is less than predetermined threshold value;
4th determines subelement 509, when being less than predetermined threshold value for described percentages, determines that fault type that electric hydraulic power-assisted steering system occurs is that the oil mass of petrol storage tank is few.
Search subelement 510, for search in the matching relationship figure prestored identical with the oil pressure between electric power steering oil pump and hydraulic oil distribution valve with the valve opening of the hydraulic oil distribution valve in described working parameter or in default error limit immediate target oil pressure and target valve aperture;
Computation subunit 511, for when finding target oil pressure and target valve aperture, by the hydraulic oil distribution valve corresponded in the target flow of described target oil pressure and target valve aperture and described working parameter and turn to the hydraulic fluid flow rate between performance element to subtract each other, to obtain difference;
5th judgment sub-unit 512, for judging whether described difference exceeds default error burst;
5th determines subelement 513, when exceeding default error burst for described difference, determines that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
6th judgment sub-unit 514, for judging hydraulic oil distribution valve and turning to the hydraulic fluid flow rate between performance element whether to be greater than described target oil mass;
6th determines subelement 515, for hydraulic oil distribution valve and when turning to the hydraulic fluid flow rate between performance element to be greater than described target oil mass, determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is larger, at hydraulic oil distribution valve and when turning to the hydraulic fluid flow rate between performance element to be less than described target oil mass, determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is less.
Preferably, shown in figure 6, described controller can also comprise:
Integral arithmetic unit 601, for carrying out integral operation to the voltage and current at motor two ends, obtains the consumption of current of described electric hydraulic power-assisted steering system in Preset Time, to estimate car load consumption of current.
Alarm display unit 602, for the prompting of et out of order alarm, and shows the fault and the consumption of current of described electric hydraulic power-assisted steering system in Preset Time determined.
In the technical scheme of the present embodiment, under the current time gathered by reception, the working parameter of electric hydraulic power-assisted steering system, and described working parameter is made a concrete analysis of thus determines the fault type that the parts of electric hydraulic power-assisted steering system occur, achieve the function of electric hydraulic power-assisted steering system fault self-diagnosis.
Further, after determining the fault type that electric hydraulic power-assisted steering system occurs, in the present embodiment, by alarm lamp, the fault type of described generation can also be prompted to chaufeur, such chaufeur just can make corresponding action for fault alarm, such as brake, the accident caused to avoid the fault because electric hydraulic power-assisted steering system occurs in time; In addition, maintainer can determine the concrete fault occurred by the display of telltale, can keep in repair targetedly, saved the time of failture evacuation and maintenance, saved labour cost electric hydraulic power-assisted steering system, improves maintenance efficiency.
Further, the technical scheme of the present embodiment is by carrying out integral operation to the voltage and current at motor two ends, obtain the consumption of current of described electric hydraulic power-assisted steering system in Preset Time, can estimate car load consumption of current, to grasp the consumption of current of vehicle.
It should be noted that, it is inner that alarm display unit can be integrated in described controller, also can independent of described controller.
It should be noted that, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
For device embodiment, because it corresponds essentially to embodiment of the method, so relevant part illustrates see the part of embodiment of the method.Device embodiment described above is only schematic, the wherein said unit illustrated as separating component or can may not be and physically separates, parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple network element.Some or all of module wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.Those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (6)

1. an electric hydraulic power-assisted steering system method for diagnosing faults, is characterized in that, comprising:
Be received in the working parameter of electric hydraulic power-assisted steering system that current time gathers, described working parameter comprises the voltage and current at motor two ends, the valve opening of hydraulic oil distribution valve, the management signal of high pressure administrative unit, the oil mass of petrol storage tank, oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turns to the hydraulic fluid flow rate between performance element;
According to the fault type that the parts of described operation parameters analysis electric hydraulic power-assisted steering system occur; The fault type that the described parts according to described operation parameters analysis electric hydraulic power-assisted steering system occur, comprising:
Search in the matching relationship figure prestored identical with the oil pressure between electric power steering oil pump and hydraulic oil distribution valve with the valve opening of the hydraulic oil distribution valve in described working parameter or in default error limit immediate target oil pressure and target valve aperture;
If find, then by the hydraulic oil distribution valve corresponded in the target flow of described target oil pressure and target valve aperture and described working parameter and turn to the hydraulic fluid flow rate between performance element to subtract each other, to obtain difference;
Judge whether described difference exceeds default error burst, if exceed, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
2. method according to claim 1, is characterized in that, describedly judges whether described difference exceeds default error burst, if exceed, then determine fault type that electric hydraulic power-assisted steering system occurs be oil circuit abnormal after, also comprise:
Judge hydraulic oil distribution valve and turn to the hydraulic fluid flow rate between performance element whether to be greater than described target oil mass, if be greater than, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is larger;
If be less than, then determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is less.
3. method according to claim 1, is characterized in that, described method also comprises:
Integral operation is carried out to the voltage and current at motor two ends, obtains the consumption of current of described electric hydraulic power-assisted steering system in Preset Time, to estimate car load consumption of current.
4. a controller, is characterized in that, described controller comprises:
Receiving element, for being received in the working parameter of electric hydraulic power-assisted steering system that current time gathers, described working parameter comprises the voltage and current at motor two ends, the valve opening of hydraulic oil distribution valve, the management signal of high pressure administrative unit, the oil mass of petrol storage tank, oil pressure between electric power steering oil pump and hydraulic oil distribution valve, hydraulic oil distribution valve and turns to the hydraulic fluid flow rate between performance element;
Analytic unit, for the fault type occurred according to the parts of described operation parameters analysis electric hydraulic power-assisted steering system; Described analytic unit specifically comprises:
Search subelement, for search in the matching relationship figure prestored identical with the oil pressure between electric power steering oil pump and hydraulic oil distribution valve with the valve opening of the hydraulic oil distribution valve in described working parameter or in default error limit immediate target oil pressure and target valve aperture;
Computation subunit, for when finding target oil pressure and target valve aperture, by the hydraulic oil distribution valve corresponded in the target flow of described target oil pressure and target valve aperture and described working parameter and turn to the hydraulic fluid flow rate between performance element to subtract each other, to obtain difference;
5th judgment sub-unit, for judging whether described difference exceeds default error burst;
5th determines subelement, when exceeding default error burst for described difference, determines that the fault type that electric hydraulic power-assisted steering system occurs is that oil circuit is abnormal.
5. controller according to claim 4, is characterized in that, described analytic unit also comprises:
6th judgment sub-unit, for judging hydraulic oil distribution valve and turning to the hydraulic fluid flow rate between performance element whether to be greater than described target oil mass;
6th determines subelement, for hydraulic oil distribution valve and when turning to the hydraulic fluid flow rate between performance element to be greater than described target oil mass, determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is larger, at hydraulic oil distribution valve and when turning to the hydraulic fluid flow rate between performance element to be less than described target oil mass, determine that the fault type that electric hydraulic power-assisted steering system occurs is that valve opening is less.
6. controller according to claim 4, is characterized in that, described controller also comprises:
Integral arithmetic unit, for carrying out integral operation to the voltage and current at motor two ends, obtains the consumption of current of described electric hydraulic power-assisted steering system in Preset Time, to estimate car load consumption of current.
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