CN103375586B - 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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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 electromagnetic type neutral gear sensor.
Background technique
At present, automobile intelligent start stop system can the start-stop of driver assistance management motor, reduces at the idling operation waited traffic lights and in the situation such as traffic congestion, thus reaches the object reducing oil consumption, reduce discharge.But in the implementation procedure of intelligent start/stop system, neutral signal is a very important enable condition of shutdown, how accurately to differentiate that neutral signal is the key that can intelligent start/stop realize.
Intelligent start/stop system comprises stopping and starting two parts, and motor is shut down to comprise and shut down enable condition and shutdown trigger condition, and engine restarting comprises restarts enable condition and restarts trigger condition.In the running process of vehicle, shut down enable condition if meet, the stopping function of vehicle is enable (namely now the hold function of vehicle can be used, but does not have trigger condition, so vehicle can't stop).When the stopping function of vehicle is enable, if driver steps on clutch completely, and hang neutral (meeting trigger condition), then vehicle stops.After vehicle stops, the restarting enable condition of intelligent start/stop system to motor is inquired about, and when engine restarting is enable, if meet the trigger condition of engine restarting, then vehicle restarts.
When identifying neutral, general employing switch type neutral gear sensor or electromagnetic type neutral gear sensor.A switch type neutral gear sensor output switching signal, namely export high level during neutral, output low level during non-neutral is discrete signal, is not continuous print waveform.Compare general switch type neutral gear sensor, electromagnetic type neutral gear sensor exports PWM (pulse duration modulation) ripple of two-way complementary duty cycle, by catching the dutycycle of PWM ripple signal to identify neutral, has fault self-diagnosis function.
In theory, when the dutyfactor value of two-way PWM ripple drops on 50% scope that is basic point, be neutral, otherwise be non-neutral.But in the operating mode of reality, owing to there is the error of sensor own and alignment error, and in use due to the error that electromagnetic type neutral gear sensor is aging or the driving habits of driver causes, the basic point of neutral dutycycle determination range is not fixing, but the value of a change.Therefore, although electromagnetic type neutral gear sensor compares general switch type neutral gear sensor have fault self-diagnosis function, reliability is higher, there is the neutral caused due to various error equally and judges inaccurate problem.
Summary of the invention
Aspects and advantages of the present invention are partly stated in the following description, or can be apparent from this description, or learn by putting into practice the present invention.
Accurately neutral is differentiated in order to electromagnetic type neutral gear sensor can be utilized in different situations, the invention provides a kind of neutral method of discrimination based on electromagnetic type neutral gear sensor, the basic point of neutral dutyfactor value determination range is obtained by software algorithm, realize the self study to neutral dutycycle, self-correcting, self compensation, thus improve the accuracy and the real-time that judge 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 adopted technological scheme:
According to an aspect of the present invention, a kind of neutral method of discrimination based on electromagnetic type neutral gear sensor is provided, comprises the following steps:
S1. the neutral gear dutyfactor value of the multiple self study of storage of array is adopted in memory, and the initial value of all neutral gear dutyfactor values of described array is set to 50%, the neutral gear dutyfactor value of the plurality of self study obtains respectively when former vehicles power on, the neutral gear dutyfactor value of the second road pulse width modulation wave in the pulse width modulation wave of two-way complementation that exported by electromagnetic type neutral gear sensor;
S2. after vehicle powers on, read the neutral gear dutyfactor value of the plurality of self study, after getting median or mean value, the complementary of this median or mean value is judged the basic point of scope as neutral dutycycle, judge whether the dutyfactor value of 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 within the scope of this, then judge that vehicle is neutral;
Or, this median or mean value are judged the basic point of scope as neutral dutycycle, judge whether the dutyfactor value of 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 within the scope of this, then judge that vehicle is neutral;
S3. when judging that vehicle is neutral, carry out the self study of neutral gear dutyfactor value, dutyfactor value in described array is moved one forward successively, to vacate last dutyfactor value position of array, again to the dutyfactor value of the second road pulse width modulation wave of the current output of last dutyfactor value position write electromagnetic type neutral gear sensor, use when powering on for next vehicle.
According to one embodiment of present invention, last position of this array is check bit, be used for store check code, check code be above each dutyfactor value and.
According to one embodiment of present invention, in described step S1, after the trigger action starting new car neutral gear dutyfactor value self study first being detected, if now vehicle idling and the complete adhesive of clutch, then be all set to the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor by the plurality of neutral gear dutyfactor value.
According to one embodiment of present invention, the trigger action of this new car neutral gear dutyfactor value self study first realizes by arranging the key press time of start stop switch.
According to one embodiment of present invention, in described step S2, if read the failure of neutral gear dutyfactor value, then the default value preset is judged the basic point of scope as this neutral dutycycle.
According to one embodiment of present invention, in described step S2, first limit value process is carried out to the plurality of neutral gear dutyfactor value read, then median or mean value are got to the multiple neutral gear dutyfactor values after limit value.
According to one embodiment of present invention, in described step S3, after the dutyfactor value of the second road pulse width modulation wave by current for electromagnetic type neutral gear sensor output is preserved, in this vehicle power up, no longer carry out the self study of neutral gear dutyfactor value.
According to one embodiment of present invention, in described step S3, when judge engine idle and clutch complete adhesive, then carry out the self study of this neutral gear dutyfactor value.
Utilize the present invention, the neutral efficiently solving electromagnetic type neutral gear sensor judges inaccurate problem, can be realized by software control algorithm completely, without the need to doing structural change, the development time is short, and cost is low, achieve the self study to neutral dutycycle, self-correcting, self compensation, improve the accuracy and real-time that judge neutral, and improve the adaptivity to different automobile types, for ensureing that the superior function of intelligent start/stop system is laid a good foundation.
By reading specification, those of ordinary skill in the art will understand the characteristic sum aspect of these embodiments and other embodiment better.
Accompanying drawing explanation
Below by with reference to accompanying drawing describe the present invention particularly in conjunction with example, advantage of the present invention and implementation will be more obvious, wherein content shown in accompanying drawing is only for explanation of the present invention, and does not form restriction of going up in all senses of the present invention, in the accompanying drawings:
Fig. 1 is the switching pulse figure of intelligent start/stop system according to an embodiment of the invention;
Fig. 2 is first stage 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, software view designs a kind of neutral self-learning method, do not need to make other structural amendment, to improve the degree of accuracy judging neutral, adapt to different operating modes and vehicle.The neutral self-learning method proposed in the present embodiment is divided into two benches, does not have positive connection between the two.
first stage: the self study first after new car rolls off the production line
Self study first after new car rolls off the production line with start stop switch signal for trigger condition.Start stop switch is contained in the left bottom of automobile instrument panel, is a push-button switch.When pressing, start and stop function is opened, and again presses, and start and stop function is closed.
First define in program a size be the neutral array of 30 (certainly, also the array of other size can be adopted), its initial value is 50%, and front 29 values of array are used for storing neutral dutyfactor value, 30th value is used for storing check code, check code be front 29 values with.
Front 29 values of array are all written as neutral dutyfactor value under present case by the self study first after new car rolls off the production line; And vehicle normal in self study, all by neutral array successively mobile forward at every turn before writing, to vacate the 29th of neutral array, and then to the 29th the current neutral dutyfactor value of write.After each self study completes, neutral array all can stored in storage (as Flash), and when self study starts at every turn (except the self study first after new car rolls off the production line), the neutral array value in Flash is read in capital first, then get median by middle position value filtering method, judge the basic point of scope using the complementary of median or median as current neutral dutycycle.
Because electromagnetic type neutral gear sensor exports the PWM ripple of two-way complementation, for the complementarity of checking two-way ripple, fault self-diagnosis is carried out to neutral gear sensor, roll off the production line self study and vehicle self study under normal circumstances of new car is all stored in neutral array by the dutycycle of the second road PWM ripple, after getting median by middle position value filtering, get its complementary judges scope basic point as neutral dutycycle; And then judge, in the scope whether dutycycle of first via PWM ripple falls centered by this basic point, if within the scope of this, then can be judged as neutral.
If start stop switch is pressed, then export high level, start and stop function is opened; If again press, then output low level, start and stop function is forbidden, and continuous print switch is pressed can the square signal shown in output map 1, wherein t1, t2, t3 and t4 representation switch time of pressing.
The trigger action of new car neutral gear dutyfactor value self study first realizes by arranging the key press time of start stop switch.The high-low level time of switching signal is recorded respectively in program.When the time of low and high level meets following relation: t2>2*t1, t3>2*t1, and t2>2*t4, t3>2*t4, then enable neutral self-learning function.If now vehicle idling and the complete adhesive of clutch, then write current neutral dutyfactor value to front 29 positions of neutral array.New car rolls off the production line the perfect overall self-learning algorithm of self study, and improve rapidity and the accuracy of this control algorithm, its program flow diagram as shown in Figure 2.
In main program ring, neutral first self-learning module at a certain time interval (as 500ms) call.As shown in Figure 2, the workflow of this submodule is as follows:
First step 1. calculates the key press time of start stop switch;
Step 2. judges whether the time that continuous switch is pressed is greater than 0s, is less than 10s;
Step 3. judges whether the start stop switch time meets the requirements.Calculating time of start stop switch is the basis judging whether to carry out neutral self study first, and judges switching time whether in certain scope, and object is to prevent unexpected and incorrect key operation.After obtaining the time of button, condition criterion is carried out to the switching time of start and stop;
If step 4. meets the condition shown in Fig. 1 switching time, then enable new car neutral self study first;
Step 5. judges vehicle whether idling and the complete adhesive of clutch, if, then carry out new car roll off the production line after self study first, current neutral dutyfactor value is write first 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 next vehicle travel process.
second stage: the self study during vehicle normally uses
After vehicle powers at every turn, system all can carry out only neutral self study once, to adapt to operating mode at that time.This part self study is divided into two steps, the first step for read neutral array value from Flash, and middle position value filtering is carried out to neutral array, choose median as the basic point (can certainly adopt mean value, the present embodiment is described for median) judging neutral duty cycle range in this vehicle travel process; Second step is move one forward by first 29 of neutral array, to vacate the 29th, and writes the neutral dutyfactor value in this vehicle travel process to it, neutral array is used for next vehicle self study stored in Flash.
In this vehicle travel process, the judgement flow process of neutral shift range is as shown in Figure 3:
After step 7. vehicle powers on, self study value several times before first system reads from flash storage, i.e. neutral array value;
If step 9. step 7 does not execute, then using the default value that sets in the program judgement scope basic point as this neutral dutycycle;
Step 8. is in case there is the exceptional value of neutral dutycycle in self study last time process, carries out limit value process to the neutral array value scope read;
Carry out middle position value filtering to neutral array again after step 10. limit value, by array value from small to large by ascending order arrangement, then process obtains median after filtering;
The median of step 11. peek group is as the basic point of dutycycle determination range in space in this vehicle travel process; The object of middle position value filtering is the neutral dutyfactor value fluctuation overcome because accidentalia causes;
Step 12. is last centered by basic point, in combination with testing the upper and lower bound width determined, determines the judgement scope of neutral dutycycle.
The neutral array value read in Flash determines the judgement scope of neutral dutycycle in this running process, and after being judged to be neutral gear, vehicle, by storing the dutyfactor value of neutral in this running process, uses for during next vehicle launch.Program flow diagram as shown in Figure 4, checks a neutral self study condition at interval of 200ms, if step 13,14,15,16 all satisfied, then enable neutral self study.The enable condition that vehicle carries out self study is: 1) the system electrification time is greater than 2s; 2) from vehicle launch, also do not carry out a self study, namely self study flag bit be 0 (in program, 0 is represented as and carries out self study, and 1 represents self study completes, and program initialization is 0); 3) vehicle first self study flag bit be 0, be not namely the self study first after new car rolls off the production line.More than meeting three conditions prerequisite under, if now vehicle speed is 0, engine speed is greater than 500 (i.e. engine idles), and the complete adhesive of clutch, then program enters neutral self-learning module.
Each step in Fig. 4 is described as follows:
Step 13. judges whether the system electrification time is greater than 2s, in this way, then enters next step;
Step 14. not yet carries out self study after judging whether startup, in this way, then enters next step;
Step 15. judges whether that non-new car rolls off the production line self study, in this way, then enters next step;
If step 16. engine idle and the complete adhesive of clutch, then enter next step;
The enable neutral gear self study of step 17.;
Neutral gear dutycycle is newly worth stored in neutral gear array by step 18.; First program by front 29 values of neutral array mobile successively, namely vacates the 29th position of array forward, and this is used for depositing the dutyfactor value of current neutral, and this dutyfactor value calculates gained by capturing unit; The 30th of array be used for depositing first 29 and, as check code;
After step 19. has upgraded neutral array, up-to-date neutral array value stored in flash, reads for during next vehicle launch by program;
The self study of step 20. neutral completes.
Later car starts at every turn, all the flow process by Fig. 3 and Fig. 4 is carried out neutral self study.Neutral array initialization value is 50%, if only carry out neutral self study by above method, owing to only having got the basic point of median as neutral dutycycle judgement scope of neutral array during each self study, and the size of neutral array is 30, then vehicle need start the self study value just reading actual neutral repeatedly, and what read above is all the initial value 50% of neutral array.For overcoming this defect, system increases the self study first that new car rolls off the production line on the basis of above self-learning method, specifically see the description of first stage part in the present embodiment.
It should be noted that, in the above-described embodiments, in order to verify the complementarity of two-way ripple, fault self-diagnosis is carried out to neutral gear sensor, be judge the basic point of scope using the complementary of median (or mean value) as neutral dutycycle, judge to judge whether vehicle is neutral in the scope whether dutyfactor value of the first via PWM ripple of the current output of electromagnetic type neutral gear sensor falls into centered by this basic point.Median (or mean value) also directly can be judged the basic point of scope as neutral dutycycle by those skilled in the art, judges to judge whether vehicle is neutral in the scope whether dutyfactor value of the second road PWM ripple of the current output of electromagnetic type neutral gear sensor falls into centered by this basic point.
In this manual, " first via " and " the second tunnel " just needs for convenience, and do not mean that and carried out any restriction, " first via " and " the second tunnel " PWM ripple can be the arbitrary road PWM ripple in the PWM ripple of two-way complementary duty cycle.
The neutral self-learning method that the present invention proposes, the neutral efficiently solving electromagnetic type neutral gear sensor judges inaccurate problem, improves accuracy and the real-time of neutral judgement, for ensureing that the superior function of intelligent start/stop system is laid a good foundation.In addition, the present invention can be realized by software control algorithm completely, and without the need to doing structural change, the development time is short, and cost is low.
Above 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 multiple flexible program can be had to realize the present invention.For example, to illustrate as the part of an embodiment or the feature that describes can be used for another embodiment to obtain another embodiment.These are only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention that the equivalence change that all utilizations specification of the present invention and accompanying drawing content are done all is contained within interest field of the present invention.
Claims (8)
1., based on a neutral method of discrimination for electromagnetic type neutral gear sensor, comprise the following steps:
S1. the neutral gear dutyfactor value of the multiple self study of storage of array is adopted in memory, and the initial value of all neutral gear dutyfactor values of described array is set to 50%, the neutral gear dutyfactor value of described multiple self study obtains respectively when former vehicles power on, the neutral gear dutyfactor value of the second road pulse width modulation wave in the pulse width modulation wave of two-way complementation that exported by electromagnetic type neutral gear sensor;
S2. after vehicle powers on, read the neutral gear dutyfactor value of described multiple self study, after getting median or mean value, the complementary of described median or mean value is judged the basic point of scope as neutral dutycycle, judge whether the dutyfactor value of 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, then judge that vehicle is neutral;
Or, described median or mean value are judged the basic point of scope as neutral dutycycle, judge whether the dutyfactor value of 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, then judge that vehicle is neutral;
S3. when judging that vehicle is neutral, carry out the self study of neutral gear dutyfactor value, dutyfactor value in described array is moved one forward successively, to vacate last dutyfactor value position of array, again to the dutyfactor value of the second road pulse width modulation wave of the current output of last dutyfactor value position write electromagnetic type neutral gear sensor, use when powering on for next vehicle.
2. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 1, is characterized in that, last position of described array is check bit, be used for store check code, check code be above each dutyfactor value and.
3. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 1 and 2, it is characterized in that, in described step S1, after the trigger action starting new car neutral gear dutyfactor value self study first being detected, if now vehicle idling and the complete adhesive of clutch, then be all set to the dutyfactor value of the second road pulse width modulation wave of the current output of electromagnetic type neutral gear sensor by described multiple neutral gear dutyfactor value.
4. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 3, is characterized in that, the trigger action of described new car neutral gear dutyfactor value self study first realizes by arranging the key press time of start stop switch.
5. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 1 and 2, it is characterized in that, in described step S2, if read the failure of neutral gear dutyfactor value, then the default value preset is judged the basic point of scope as this neutral dutycycle.
6. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 1 and 2, it is characterized in that, in described step S2, first limit value process is carried out to the described multiple neutral gear dutyfactor values read, then median or mean value are got to the multiple neutral gear dutyfactor values after limit value.
7. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 1 and 2, it is characterized in that, in described step S3, after the dutyfactor value of the second road pulse width modulation wave by current for electromagnetic type neutral gear sensor output is preserved, in this vehicle power up, no longer carry out the self study of neutral gear dutyfactor value.
8. the neutral method of discrimination based on electromagnetic type neutral gear sensor according to claim 1 and 2, is characterized in that, in described step S3, when judge engine idle and clutch complete adhesive, then carry out the self study of described neutral gear dutyfactor value.
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| CN107031596B (en) * | 2016-12-15 | 2019-04-12 | 上海拓为汽车技术有限公司 | A kind of electric booster braking displacement sensor diagnostic method |
| CN106641231B (en) * | 2017-01-18 | 2018-09-14 | 广州汽车集团股份有限公司 | Line traffic control selector gear self-learning method, system and line traffic control selector system |
| CN107100995B (en) * | 2017-04-21 | 2019-04-02 | 广州汽车集团股份有限公司 | A kind of car transmission gear detection method and device |
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