CN103375586A - Method for discriminating neutral gear on basis of electronic neutral gear sensor - Google Patents
Method for discriminating neutral gear on basis of electronic neutral gear sensor Download PDFInfo
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- CN103375586A CN103375586A CN2012101094806A CN201210109480A CN103375586A CN 103375586 A CN103375586 A CN 103375586A CN 2012101094806 A CN2012101094806 A CN 2012101094806A CN 201210109480 A CN201210109480 A CN 201210109480A CN 103375586 A CN103375586 A CN 103375586A
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Abstract
The invention provides a method for discriminating a neutral gear on the basis of an electromagnetic neutral gear sensor. The method includes storing a plurality of self-learning neutral gear duty cycle values in a memory, reading the self-learning neutral gear duty cycle values after a vehicle is powered on, solving a median value or an average value of the self-learning neutral gear duty cycle values, then using a complementary value of the median value or the average value as a base point of a neutral gear duty cycle discriminating range, judging whether duty cycle values of currently outputted first PWM (pulse width modulation) waves are in a range with the base point as the center or not, and determining that the vehicle is in the neutral gear if the duty cycle values of the first PWM waves are within the range; performing self-learning on the neutral gear duty cycle values, and storing duty cycle values of second PWM waves which are currently outputted by the electromagnetic neutral gear sensor so that the duty cycle values of the second PWM waves can be used when the vehicle is powered on for the next time. The method has the advantages that the base point of the range for discriminating the neutral gear duty cycle values can be acquired by a software algorithm, so that self-learning, self-correcting and self-compensating can be performed on a neutral gear duty cycle, the neutral gear discriminating accuracy and instantaneity can be improved, and the adaptability to different types of vehicles can be improved.
Description
Technical field
The present invention relates to automobile technical field, be specifically related to a kind of neutral method of discrimination based on the electromagnetic type neutral gear sensor.
Background technique
At present, but the start and stop of automobile intelligent start stop system driver assistance management motor action, reduce wait traffic lights and the situation such as traffic congestion under idling operation, thereby reach the purpose that reduces oil consumption, reduces to discharge.Yet in the implementation procedure of intelligent start stop system, the neutral signal is that a very important shutdown enables condition, and how accurately differentiating the neutral signal is the key that can intelligent start and stop realize.
The intelligence start stop system comprises and stops and starting two parts, and engine shutdown comprises shuts down the condition that enables and shut down trigger condition, and engine restarting comprises restarts the condition of enabling and restart trigger condition.In the running process of vehicle, if satisfy the condition that enables of shutting down, the stopping function of vehicle enables (namely the hold function of vehicle can be used at this moment, but does not have trigger condition, so vehicle can't stop).In the situation that the stopping function of vehicle enables, if the driver steps on clutch fully, and hang neutral (satisfying trigger condition), then vehicle stop.Behind the vehicle stop, intelligent start stop system is inquired about the condition of enabling of restarting of motor, and in the situation that engine restarting enables, if satisfy the trigger condition of engine restarting, then vehicle restarts.
When the identification neutral, generally adopt switch type neutral gear sensor or electromagnetic type neutral gear sensor.A switch type neutral gear sensor output switching signal, i.e. neutral time output high level, output low level during non-neutral is discrete signal, is not continuous waveform.Compare general switch type neutral gear sensor, PWM (pulse duration modulation) ripple of electromagnetic type neutral gear sensor output two-way dutycycle complementation can recently be identified neutral by the duty of catching PWM ripple signal, has fault self-diagnosis function.
In theory, when the dutyfactor value of two-way PWM ripple drops on take 50% during as the scope of basic point, be neutral, otherwise be non-neutral.But in the operating mode of reality, owing to have the error of sensor own and alignment error, and in use because the error that the electromagnetic type neutral gear sensor is aging or driver's driving habits causes, the basic point of neutral dutycycle determination range is not fixed, but the value of a variation.Therefore, have fault self-diagnosis function although the electromagnetic type neutral gear sensor is compared general switch type neutral gear sensor, reliability is higher, and the same neutral that causes owing to various errors that exists is judged inaccurate problem.
Summary of the invention
Aspects and advantages of the present invention are partly statement in the following description, perhaps can describe obviously from this, perhaps can learn by putting into practice the present invention.
In order in different situations, to utilize the electromagnetic type neutral gear sensor accurately to differentiate neutral, the invention provides a kind of neutral method of discrimination based on the electromagnetic type neutral gear sensor, can obtain by software algorithm the basic point of neutral dutyfactor value determination range, realization is to self study, self-correcting, the self compensation of neutral dutycycle, thereby improve accuracy and the real-time of judging neutral, and improve the adaptivity to different automobile types.
It is as follows that the present invention solves the problems of the technologies described above the technological scheme that adopts:
According to an aspect of the present invention, provide a kind of neutral method of discrimination based on the electromagnetic type neutral gear sensor, comprise the following steps:
S1. the neutral dutyfactor value of a plurality of self studies of storage in storage, the neutral dutyfactor value of these a plurality of self studies obtains respectively when former vehicles power on, by the neutral dutyfactor value of the second road pulse width modulation wave in the pulse width modulation wave of the two-way complementation of electromagnetic type neutral gear sensor output;
S2. after vehicle powers on, read the neutral dutyfactor value of these a plurality of self studies, after getting median or mean value, the complementary of this median or mean value is judged the basic point of scope as the neutral dutycycle, whether the dutyfactor value of judging the first via pulse width modulation wave of the current output of electromagnetic type neutral gear sensor falls in the scope centered by this basic point, if in this scope, judge that then vehicle is neutral;
Perhaps, this median or mean value are judged the basic point of scope as the neutral dutycycle, whether the dutyfactor value of judging the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor falls in the scope centered by this basic point, if in this scope, judges that then vehicle is neutral;
S3. judging that vehicle is in the situation of neutral, carry out the self study of neutral dutyfactor value, the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor is preserved in this storage, use when powering on for next vehicle.
According to one embodiment of present invention, adopt this neutral dutyfactor value of storage of array, and the initial value of all neutral dutyfactor values of this array is made as 50%.
According to one embodiment of present invention, in described step S3, when carrying out the self study of neutral dutyfactor value, dutyfactor value in this array is moved one forward successively, to vacate last dutyfactor value position of array, again last dutyfactor value position is write the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor.
According to one embodiment of present invention, this array last the position be check bit, be used for storing check code, check code be each dutyfactor value of front with.
According to one embodiment of present invention, in described step S1, after detecting the trigger action that starts first neutral dutyfactor value self study of new car, if this moment vehicle idling and complete adhesive of clutch then will these a plurality of neutral dutyfactor values all be set to the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor.
According to one embodiment of present invention, this new car first the trigger action of neutral dutyfactor value self study be to arrange by the button time to start stop switch to realize.
According to one embodiment of present invention, in described step S2, if read the failure of neutral dutyfactor value, then default default value is judged the basic point of scope as this neutral dutycycle.
According to one embodiment of present invention, in described step S2, first these a plurality of neutral dutyfactor values that read are carried out limit value and process, the more a plurality of neutral dutyfactor values behind the limit value are got median or mean value.
According to one embodiment of present invention, in described step S3, after the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor is preserved, in this vehicle power up, no longer carry out the self study of neutral dutyfactor value.
According to one embodiment of present invention, in described step S3, in the situation of judging engine idle and the complete adhesive of clutch, carry out again the self study of this neutral dutyfactor value.
Utilize the present invention, the neutral that efficiently solves the electromagnetic type neutral gear sensor is judged inaccurate problem, can realize by software control algorithm fully, need not to do structural change, the development time is short, and cost is low, self study, self-correcting, self compensation to the neutral dutycycle have been realized, improved and judged accuracy and the real-time of neutral, and improved the adaptivity to different automobile types, for the superior function that guarantees intelligent start stop system is laid a good foundation.
By reading specification, those of ordinary skills will understand these embodiments and other embodiment's feature and aspect better.
Description of drawings
Below by describing particularly the present invention with reference to the accompanying drawings and in conjunction with example, advantage of the present invention and implementation will be more obvious, wherein content shown in the accompanying drawing only is used for explanation of the present invention, and does not consist of the restriction of going up in all senses of the present invention, in the accompanying drawings:
Fig. 1 is the switching pulse figure of according to an embodiment of the invention intelligent start stop system;
Fig. 2 is phase I neutral self study flow chart according to an embodiment of the invention;
Fig. 3 is second stage neutral self study flow chart one according to an embodiment of the invention;
Fig. 4 is second stage neutral self study flowchart 2 according to an embodiment of the invention.
Embodiment
In the present embodiment, on the basis of electromagnetic type neutral gear sensor, at a kind of neutral self-learning method of software view design, do not need to make other structural modification, to improve the degree of accuracy of judging neutral, adapt to different operating mode and vehicle.The neutral self-learning method that proposes in the present embodiment was divided into for two stages, did not have positive connection between the two.
Phase I: the first self study after new car rolls off the production line
First self study after new car rolls off the production line is take the start stop switch signal as trigger condition.Start stop switch is contained in the left bottom of automobile instrument panel, is a push-button switch.When pressing, the start and stop function is opened, and again presses, and the start and stop function is closed.
At first defined a size in the program and be 30 neutral array (certainly, also can adopt other big or small array), its initial value is 50%, front 29 values of array are used for storing the neutral dutyfactor value, the 30th value is used for storing check code, check code be front 29 values and.
First self study after new car rolls off the production line all is written as neutral dutyfactor value under the present case with front 29 values of array; And the self study of vehicle in normal all with successively mobile one of neutral array, vacating the 29th of neutral array, and then writes current neutral dutyfactor value to the 29th forward before writing at every turn.After each self study is finished, the neutral array all can deposit in the storage (such as Flash), and each self study is when beginning (the first self study after new car rolls off the production line), the neutral array value among the Flash is at first read in the capital, then get median by the middle position value filtering method, judge the basic point of scope with the complementary of median or median as current neutral dutycycle.
Because the PWM ripple of electromagnetic type neutral gear sensor output two-way complementation, complementarity for checking two-way ripple, neutral gear sensor is carried out fault self-diagnosis, roll off the production line self study and vehicle self study under normal circumstances of new car all is that dutycycle with the second road PWM ripple deposits the neutral array in, after getting median by middle position value filtering, get its complementary is judged scope as the neutral dutycycle basic point; And then whether the dutycycle of judging first via PWM ripple fall in the scope centered by this basic point, if in this scope, then can be judged as neutral.
If start stop switch is pressed, then export high level, the start and stop function is opened; If again press, output low level then, start and stop function forbidding, continuous switch are pressed can output square signal shown in Figure 1, wherein t1, t2, t3 and t4 representation switch time of pressing.
The new car first trigger action of neutral dutyfactor value self study is to arrange by the button time to start stop switch to realize.Record respectively the high-low level time of switching signal in the program.When the time of high-low level was satisfied following the relation: t2＞2*t 1, and t3＞2*t 1, and t2＞2*t4, and t3＞2*t4 then enables the neutral self-learning function.If this moment, vehicle idling and the complete adhesive of clutch then write current neutral dutyfactor value to front 29 positions of neutral array.New car roll off the production line self study perfect whole self-learning algorithm, improved rapidity and the accuracy of this control algorithm, its program flow diagram as shown in Figure 2.
In the main program ring, neutral first self-learning module at a certain time interval (such as 500ms) call.As shown in Figure 2, the workflow of this submodule is as follows:
Step 2. judges that whether time that continuous switch presses is greater than 0s, less than 10s;
Step 3. judges whether the start stop switch time meets the requirements.The time of calculating start stop switch is the basis that judges whether to carry out first neutral self study, and judges switching time whether in certain scope, and purpose is to prevent unexpected and incorrect key operation.After obtaining the time of button, to carrying out condition criterion the switching time of start and stop;
If step 4. satisfies condition shown in Figure 1 switching time, then enable first neutral self study of new car;
Step 5. is judged vehicle whether idling and the complete adhesive of clutch, if, then carry out the first self study after new car rolls off the production line, current neutral dutyfactor value is write front 29 of all neutral arrays, replace the initial value 50% of array with the neutral dutyfactor value of reality, judge the basic point of scope as neutral dutycycle in the next Vehicle Driving Cycle process.
Second stage: the self study in the normal use of vehicle
After vehicle powered at every turn, system only all can carry out neutral self study once, to adapt to operating mode at that time.This part self study was divided into for two steps, the first step is for reading the neutral array value from Flash, and the neutral array carried out middle position value filtering, choose median as the basic point (can certainly adopt mean value, present embodiment describes as an example of median example) of judging the neutral duty cycle range in this Vehicle Driving Cycle process; Second step is for moving one forward with front 29 of neutral array, vacating the 29th, and it write neutral dutyfactor value in this Vehicle Driving Cycle process, deposits the neutral array in Flash and uses for next vehicle self study.
The judgement flow process of neutral shift range is as shown in Figure 3 in this Vehicle Driving Cycle process:
After step 7. vehicle powers on, several times self study value before system at first reads from the flash storage, i.e. neutral array value;
If step 9. step 7 does not execute, then with the default value set in the program judgement scope basic point as this neutral dutycycle;
Step 8. is carried out limit value to the neutral array value scope that reads and is processed in case occur the exceptional value of neutral dutycycle in the self study last time process;
Again the neutral array is carried out middle position value filtering behind step 10. limit value, be about to array value and arrange by ascending order from small to large, then process obtaining median through filtering;
The median of step 11. peek group is as the basic point of space dutycycle determination range in this Vehicle Driving Cycle process; The purpose of middle position value filtering is to overcome the neutral dutyfactor value fluctuation that causes because of accidentalia;
Read neutral array value among the Flash and determined the judgement scope of neutral dutycycle in this running process, and after being judged to be neutral, vehicle will be stored the dutyfactor value of neutral in this running process, use during for next vehicle launch.Program flow diagram as shown in Figure 4, every interval 200ms checks neutral self study condition one time, if step 13,14,15,16 all satisfies, then enables the neutral self study.The condition of enabling that vehicle carries out self study is: 1) system's power-on time is greater than 2s; 2) from vehicle launch, also do not carry out a self study, namely the self study flag bit is 0 (0 is represented as and carries out self study in the program, and 1 represents self study finishes, and program initialization is 0); 3) vehicle first the self study flag bit be 0, namely be not the first self study after new car rolls off the production line.Under the prerequisite that satisfies above three conditions, if this moment, vehicle speed was 0, engine speed is greater than 500 (being engine idle), and the complete adhesive of clutch, and then program enters the neutral self-learning module.
Each step among Fig. 4 is described as follows:
Whether step 13. judges system's power-on time greater than 2s, in this way, then enters next step;
If the complete adhesive of step 16. engine idle and clutch then enters next step;
After step 19. had been upgraded the neutral array, program deposited up-to-date neutral array value among the flash in, reads during for next vehicle launch;
The self study of step 20. neutral is finished.
Car starts at every turn later on, all will carry out the neutral self study by the flow process of Fig. 3 and Fig. 4.Neutral array initialization value is 50%, if only carry out the neutral self study by above method, because the median of only having got the neutral array during each self study is judged the basic point of scope as the neutral dutycycle, and the size of neutral array is 30, then vehicle needs just can read the self study value of actual neutral after starting repeatedly, and what read previously all is the initial value 50% of neutral array.For overcoming this defective, system increases the first self study that new car rolls off the production line on the basis of above self-learning method, specifically referring to the description partly of phase I in the present embodiment.
Need to prove, in the above-described embodiments, in order to verify the complementarity of two-way ripple, neutral gear sensor is carried out fault self-diagnosis, be to judge the basic point of scope with the complementary of median (or mean value) as the neutral dutycycle, whether the dutyfactor value of judging the first via PWM ripple of the current output of electromagnetic type neutral gear sensor falls in the scope centered by this basic point is judged whether vehicle is neutral.Those skilled in the art also can be directly judge the basic point of scope with median (or mean value) as the neutral dutycycle, and whether the dutyfactor value of judging the second road PWM ripple of the current output of electromagnetic type neutral gear sensor falls in the scope centered by this basic point is judged whether vehicle is neutral.
In this manual, " first via " and " the second tunnel " be for convenience needs just, and do not mean that and carried out any restriction, and " first via " and " the second tunnel " PWM ripple can be the arbitrary road PWM ripples in the PWM ripple of two-way dutycycle complementation.
The neutral self-learning method that the present invention proposes, the neutral that efficiently solves the electromagnetic type neutral gear sensor is judged inaccurate problem, has improved neutral Accuracy of Judgement and real-time, for the superior function that guarantees intelligent start stop system is laid a good foundation.In addition, the present invention can realize by software control algorithm fully that need not to do structural change, the development time is short, and cost is low.
More than with reference to the accompanying drawings of the preferred embodiments of the present invention, those skilled in the art do not depart from the scope and spirit of the present invention, and can have multiple flexible program to realize the present invention.For example, the feature that illustrates or describe as an embodiment's part can be used for another embodiment to obtain another embodiment.Below only for the better feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalence that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (10)
1. the neutral method of discrimination based on the electromagnetic type neutral gear sensor comprises the following steps:
S1. the neutral dutyfactor value of a plurality of self studies of storage in storage, the neutral dutyfactor value of described a plurality of self studies obtains respectively when former vehicles power on, by the neutral dutyfactor value of the second road pulse width modulation wave in the pulse width modulation wave of the two-way complementation of electromagnetic type neutral gear sensor output;
S2. after vehicle powers on, read the neutral dutyfactor value of described a plurality of self studies, after getting median or mean value, the complementary of described median or mean value is judged the basic point of scope as the neutral dutycycle, whether the dutyfactor value of judging the first via pulse width modulation wave of the current output of electromagnetic type neutral gear sensor falls in the scope centered by described basic point, if in described scope, judge that then vehicle is neutral;
Perhaps, described median or mean value are judged the basic point of scope as the neutral dutycycle, whether the dutyfactor value of judging the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor falls in the scope centered by described basic point, if in described scope, judge that then vehicle is neutral;
S3. judging that vehicle is in the situation of neutral, carry out the self study of neutral dutyfactor value, the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor is preserved in described storage, use when powering on for next vehicle.
2. the neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 1 is characterized in that, adopts the described neutral dutyfactor value of storage of array, and the initial value of all neutral dutyfactor values of described array is made as 50%.
3. the neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 2, it is characterized in that, in described step S3, when carrying out the self study of neutral dutyfactor value, dutyfactor value in the described array is moved one forward successively, to vacate last dutyfactor value position of array, again last dutyfactor value position is write the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor.
4. the neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 3 is characterized in that, described array last the position be check bit, be used for storing check code, check code be each dutyfactor value of front with.
5. each described neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 1-4, it is characterized in that, in described step S1, after detecting the trigger action that starts first neutral dutyfactor value self study of new car, if this moment vehicle idling and complete adhesive of clutch then all is set to described a plurality of neutral dutyfactor values the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor.
6. the neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 5 is characterized in that, the described new car first trigger action of neutral dutyfactor value self study is to arrange by the button time to start stop switch to realize.
7. each described neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 1-4, it is characterized in that, in described step S2, if read the failure of neutral dutyfactor value, then default default value is judged the basic point of scope as this neutral dutycycle.
8. each described neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 1-4, it is characterized in that, in described step S2, first the described a plurality of neutral dutyfactor values that read are carried out limit value and process, the more a plurality of neutral dutyfactor values behind the limit value are got median or mean value.
9. each described neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 1-4, it is characterized in that, in described step S3, after the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor is preserved, in this vehicle power up, no longer carry out the self study of neutral dutyfactor value.
10. each described neutral method of discrimination based on the electromagnetic type neutral gear sensor according to claim 1-4, it is characterized in that, in described step S3, in the situation of judging engine idle and the complete adhesive of clutch, carry out again the self study of described neutral dutyfactor value.
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