CN205118217U - Neutral of neutral position sensor signal judges that threshold values is from learning device - Google Patents
Neutral of neutral position sensor signal judges that threshold values is from learning device Download PDFInfo
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- CN205118217U CN205118217U CN201520797831.6U CN201520797831U CN205118217U CN 205118217 U CN205118217 U CN 205118217U CN 201520797831 U CN201520797831 U CN 201520797831U CN 205118217 U CN205118217 U CN 205118217U
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Abstract
The utility model discloses a neutral of neutral position sensor signal judges that threshold values is from learning device, it is including input trapper, low -pass filtering module, from learning module, nonvolatile store, input trapper output respectively same low -pass filtering module, connect from learning module, low -pass filtering module, the output is with connecting from learning module, connect with nonvolatile store from the learning module output. The utility model discloses a neutral of neutral position sensor signal judges that threshold values is from learning device can obtain the threshold values of reasonable, accurate neutral position, can avoid since bring in installation and the manufacture process scattered poorly lead to neutral discernment to have the deviation, effectively improve the precision that the neutral was discerned.
Description
Technical field
The utility model relates to engine control technologies, particularly a kind of neutral gear decision threshold self study device of neutral position sensor signal.
Background technique
More and more stricter along with national fuel economy regulation, automobile automatic start-stop function, as a new technology, effectively can reduce the consumption of fuel oil in city operating mode, reduce motor vehicle exhaust emission, more and more used in the middle of whole vehicle functions.For the start and stop function of manual vehicle, need whether to be operated according to clutch whether to judge whether allow vehicle autostop and automatically start at neutral gear with gearbox-gear.
The neutral position sensor of the present overwhelming majority, the duty cycle signals of PWM (Pulse-WidthModulation pulse duration modulation) is sent to EMS ((EngineManagementSystem according to the physical location of gearbox-gear bar, engine management system), EMS is by judging that the value of dutycycle judges that whether gear is at neutral gear.The identification of general neutral gear is the SPEC (Specification, product requirement specification book) according to sensor, arranges an effective scope, as when the dutycycle of neutral position sensor signal is between 50% to 70%, thinks that gear is in neutral gear.The method at neutral gear is directly judged whether at present according to sensor SPEC, a drawback is had to be to solve scattered error time sensor is installed, and scattered error when different sensors manufacture, neutral position as SPEC mark is that dutycycle is 50% to 70%, but sensor after as installed due to the scattered error of mounting point and manufacture, actual neutral position may be that dutycycle is 55% to 75%, if so go to identify according to the standard of SPEC, 50% to 55%, there is error in the interval of 70% to 75%.
Model utility content
The technical problems to be solved in the utility model is to provide a kind of neutral gear decision threshold self study device of neutral position sensor signal, can obtain the threshold values of reasonable, accurate neutral position.
For solving the problems of the technologies described above, the neutral gear decision threshold self study device of the neutral position sensor signal that the utility model provides, it comprises input capture device, low-pass filtering module, self-learning module, nonvolatile storage;
Described input capture device, output terminal respectively same low-pass filtering module, self-learning module connects;
Described low-pass filtering module, output terminal connects with described self-learning module;
Described self-learning module, output terminal connects with described nonvolatile storage.
Preferably, described input capture device, processes the pwm signal that neutral position sensor exports, and obtains the dutycycle of the pwm signal that neutral position sensor exports;
Described low-pass filtering module, carries out lower pass-filter, dutycycle after output filtering to the dutycycle that described input capture device obtains;
Described self-learning module, after the filtering in the continuous multiple cycle exported by described low-pass filtering module, dutycycle carries out cumulative mean, using the intermediate value of the value after cumulative mean as neutral gear signal, the intermediate value of neutral gear signal is increased setting ratio and is deposited into described nonvolatile storage as threshold values in the actual judgement of neutral gear signal, the intermediate value of neutral gear signal is reduced setting ratio and is deposited into described nonvolatile storage as threshold values under the actual judgement of neutral gear signal.
Preferably, B
n=(A
n-B
n-1) * X+B
n-1, wherein B
ndutycycle after the current period filtering of described low-pass filtering module output, A
nthe current period dutycycle that described input capture device obtains, B
n-1be dutycycle after the upper one-period filtering of described low-pass filtering module output, X is calibration coefficient, 0<X<1.
Preferably, described self-learning module, after first judging the current period filtering that described low-pass filtering module exports, whether dutycycle is effective, if effectively, dutycycle after current period filtering added up, if invalid, reset, restart to add up;
Dutycycle B after the current period filtering that described low-pass filtering module exports
nwith the current period dutycycle A that described input capture device obtains
nthe absolute value of difference, if be greater than setting value, then after current period filtering, dutycycle is invalid, if be less than or equal to this setting value, then after current period filtering, dutycycle is effective.
Preferably, described self-learning module, when after the filtering in the continuous multiple cycle exported by described low-pass filtering module, dutycycle is carried out cumulative, cumulative number of times is calibration value.
Preferably, described input capture device, every 20ms obtains the dutycycle of the pwm signal of a neutral position sensor output; Described low-pass filtering module, every 20ms exports dutycycle after a filtering;
Described self-learning module, after the filtering in continuous 10 cycles exported by described low-pass filtering module, dutycycle adds up, and obtains mean value divided by 10.
Preferably, the described ratio that sets is as being less than 20%.。
The neutral gear decision threshold self study device of neutral position sensor signal of the present utility model, by input capture device, the pwm signal that neutral position sensor exports is processed to the frequency and dutycycle that obtain pwm signal, lower pass-filter is carried out to the dutycycle of pwm signal, the undesired signal of filtering high frequency, obtains relatively more level and smooth duty cycle signals; Self-learning module carries out cumulative mean according to by dutycycle after filtering, using the intermediate value of the value after cumulative mean as neutral gear signal, the neutral gear decision threshold of neutral position sensor signal when obtaining actual neutral gear, and be saved in (NVRAM) in nonvolatile storage.The neutral gear decision threshold self study device of neutral position sensor signal of the present utility model, the threshold values of reasonable, accurate neutral position can be obtained, can avoid causing neutral gear identification to there is deviation due to the scattered error installed and bring in manufacture process, the precision of effective raising neutral gear identification, avoids on off control under extreme operating condition to occur the risk that band shelves start.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical solution of the utility model, below the accompanying drawing used required for the utility model is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, 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 neutral gear decision threshold self study device one embodiment schematic diagram of neutral position sensor signal of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, carry out clear, complete description to the technological scheme in the utility model, obviously, described embodiment is a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, other embodiments all that those of ordinary skill in the art obtain under the prerequisite not making creative work, belong to the scope of the utility model protection.
Embodiment one
The neutral gear decision threshold self study device of neutral position sensor signal, as shown in Figure 1, comprises input capture device, low-pass filtering module, self-learning module, nonvolatile storage (NVRAM);
Described input capture device, output terminal respectively same low-pass filtering module, self-learning module connects;
Described low-pass filtering module, output terminal connects with described self-learning module;
Described self-learning module, output terminal connects with described nonvolatile storage.
Preferably, described input capture device, processes for PWM (Pulse-WidthModulation pulse duration modulation) signal exported neutral position sensor, obtains the dutycycle of the pwm signal that neutral position sensor exports;
Described low-pass filtering module, carries out lower pass-filter, dutycycle after output filtering for the dutycycle obtained described input capture device; B
n=(A
n-B
n-1) * X+B
n-1, wherein B
ndutycycle after the current period filtering of described low-pass filtering module output, A
nthe current period dutycycle that described input capture device obtains, B
n-1be dutycycle after the upper one-period filtering of described low-pass filtering module output, X is calibration coefficient, 0<X<1;
Described self-learning module, cumulative mean is carried out for dutycycle after the filtering in continuous multiple cycle that exported by described low-pass filtering module, using the intermediate value of the value after cumulative mean as neutral gear signal, the intermediate value of neutral gear signal is increased setting ratio and is deposited into described nonvolatile storage as threshold values in the actual judgement of neutral gear signal, the intermediate value of neutral gear signal is reduced setting ratio and is deposited into described nonvolatile storage as threshold values under the actual judgement of neutral gear signal.
The neutral gear decision threshold self study device of the neutral position sensor signal of embodiment one, by input capture device, the pwm signal that neutral position sensor exports is processed to the frequency and dutycycle that obtain pwm signal, lower pass-filter is carried out to the dutycycle of pwm signal, the undesired signal of filtering high frequency, obtains relatively more level and smooth duty cycle signals; Self-learning module carries out cumulative mean according to by dutycycle after filtering, using the intermediate value of the value after cumulative mean as neutral gear signal, the neutral gear decision threshold of neutral position sensor signal when obtaining actual neutral gear, and be saved in (NVRAM) in nonvolatile storage.The neutral gear decision threshold self study device of the neutral position sensor signal of embodiment one, the threshold values of reasonable, accurate neutral position can be obtained, can avoid causing neutral gear identification to there is deviation due to the scattered error installed and bring in manufacture process, the precision of effective raising neutral gear identification, avoids on off control under extreme operating condition to occur the risk that band shelves start.
Embodiment two
Based on the neutral gear decision threshold self study device of the neutral position sensor signal of embodiment one, described self-learning module, first after judging the current period filtering that described low-pass filtering module exports, whether dutycycle is effective, if effectively, dutycycle after current period filtering is added up, if invalid, reset, restart to add up;
Dutycycle B after the current period filtering that described low-pass filtering module exports
nwith the current period dutycycle A that described input capture device obtains
nthe absolute value of difference, if be greater than setting value, then after current period filtering, dutycycle is invalid, if be less than or equal to this setting value, then after current period filtering, dutycycle is effective.
Preferably, described self-learning module, when after the filtering in the continuous multiple cycle exported by described low-pass filtering module, dutycycle is carried out cumulative, cumulative number of times is calibration value.
Preferably, described input capture device, every 20ms obtains the dutycycle of the pwm signal of a neutral position sensor output; Described low-pass filtering module, every 20ms exports dutycycle after a filtering;
Described self-learning module, after the filtering in continuous 10 cycles exported by described low-pass filtering module, dutycycle adds up, and obtains mean value divided by 10, carries out cumulative mean by dutycycle after 10 filtering calculated in 200ms.
Preferably, the described ratio that sets is as being less than 20%.Value after such as, after filtering dutycycle carries out cumulative mean is 50%, increases setting ratio 10% and obtains 60%, and reducing setting ratio 10% and obtain 40%, is the neutral gear decision threshold scope finally learning to arrive with 40% to 60%.
The neutral gear decision threshold self study device of the neutral position sensor signal of embodiment two, and according to the current period dutycycle A that the input capture device before filtering obtains
nwith dutycycle B after current period filtering
ndifference, judge whether neutral position sensor signal is stablized, when difference is less than a setting value, (setting value can be demarcated, occurrence is determined according to the actual fluctuation situation of neutral position sensor signal by calibration engineer) time, neutral position sensor signal stabilization is described, this mainly in order to avoid artificial being placed on by hand, gear lever causes gear signal to fluctuate and identifies the position signal of mistake.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the utility model protects.
Claims (7)
1. a neutral gear decision threshold self study device for neutral position sensor signal, is characterized in that, comprise input capture device, low-pass filtering module, self-learning module, nonvolatile storage;
Described input capture device, output terminal respectively same low-pass filtering module, self-learning module connects;
Described low-pass filtering module, output terminal connects with described self-learning module;
Described self-learning module, output terminal connects with described nonvolatile storage.
2. the neutral gear decision threshold self study device of neutral position sensor signal according to claim 1, is characterized in that,
Described input capture device, processes the pwm signal that neutral position sensor exports, and obtains the dutycycle of the pwm signal that neutral position sensor exports;
Described low-pass filtering module, carries out lower pass-filter, dutycycle after output filtering to the dutycycle that described input capture device obtains;
Described self-learning module, after the filtering in the continuous multiple cycle exported by described low-pass filtering module, dutycycle carries out cumulative mean, using the intermediate value of the value after cumulative mean as neutral gear signal, the intermediate value of neutral gear signal is increased setting ratio and is deposited into described nonvolatile storage as threshold values in the actual judgement of neutral gear signal, the intermediate value of neutral gear signal is reduced setting ratio and is deposited into described nonvolatile storage as threshold values under the actual judgement of neutral gear signal.
3. the neutral gear decision threshold self study device of neutral position sensor signal according to claim 2, is characterized in that,
B
n=(A
n-B
n-1) * X+B
n-1, wherein B
ndutycycle after the current period filtering of described low-pass filtering module output, A
nthe current period dutycycle that described input capture device obtains, B
n-1be dutycycle after the upper one-period filtering of described low-pass filtering module output, X is calibration coefficient, 0<X<1.
4. the neutral gear decision threshold self study device of neutral position sensor signal according to claim 3, is characterized in that,
Described self-learning module, after first judging the current period filtering that described low-pass filtering module exports, whether dutycycle is effective, if effectively, dutycycle after current period filtering added up, if invalid, reset, restart to add up;
Dutycycle B after the current period filtering that described low-pass filtering module exports
nwith the current period dutycycle A that described input capture device obtains
nthe absolute value of difference, if be greater than setting value, then after current period filtering, dutycycle is invalid, if be less than or equal to this setting value, then after current period filtering, dutycycle is effective.
5. the neutral gear decision threshold self study device of neutral position sensor signal according to claim 3, is characterized in that,
Described self-learning module, when after the filtering in the continuous multiple cycle exported by described low-pass filtering module, dutycycle is carried out cumulative, cumulative number of times is calibration value.
6. the neutral gear decision threshold self study device of neutral position sensor signal according to claim 5, is characterized in that,
Described input capture device, every 20ms obtains the dutycycle of the pwm signal of a neutral position sensor output; Described low-pass filtering module, every 20ms exports dutycycle after a filtering;
Described self-learning module, after the filtering in continuous 10 cycles exported by described low-pass filtering module, dutycycle adds up, and obtains mean value divided by 10.
7. the neutral gear decision threshold self study device of neutral position sensor signal according to claim 2, is characterized in that,
The described ratio that sets is as being less than 20%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106641231A (en) * | 2017-01-18 | 2017-05-10 | 广州汽车集团股份有限公司 | Gear self-learning method and system for driven-by-wire shifter and driven-by-wire shifter system |
| CN108019502A (en) * | 2016-11-02 | 2018-05-11 | 上海汽车集团股份有限公司 | A kind of vehicle shift control method and TCU |
-
2015
- 2015-10-15 CN CN201520797831.6U patent/CN205118217U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108019502A (en) * | 2016-11-02 | 2018-05-11 | 上海汽车集团股份有限公司 | A kind of vehicle shift control method and TCU |
| CN108019502B (en) * | 2016-11-02 | 2019-09-17 | 上海汽车集团股份有限公司 | A kind of vehicle shift control method and TCU |
| CN106641231A (en) * | 2017-01-18 | 2017-05-10 | 广州汽车集团股份有限公司 | Gear self-learning method and system for driven-by-wire shifter and driven-by-wire shifter system |
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