CN114148334B - Speed direction detection method for automatic transmission automobile - Google Patents
Speed direction detection method for automatic transmission automobile Download PDFInfo
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- CN114148334B CN114148334B CN202111522208.6A CN202111522208A CN114148334B CN 114148334 B CN114148334 B CN 114148334B CN 202111522208 A CN202111522208 A CN 202111522208A CN 114148334 B CN114148334 B CN 114148334B
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- vehicle speed
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 title claims abstract description 9
- 230000007935 neutral effect Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
- B60W40/105—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/0098—Details of control systems ensuring comfort, safety or stability not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/10—Change speed gearings
- B60W2510/1005—Transmission ratio engaged
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/18—Braking system
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/10—Longitudinal speed
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a speed direction detection method for an automatic transmission automobile, wherein a gear shifting lever belongs to basic standard, and meanwhile, a safety ABS system is considered as a mandatory configuration item required by regulations, so that the current speed direction can be reliably and accurately determined on the premise of not increasing any cost, namely, on the premise of discarding the addition of an additional rotating speed sensor, only a gear shifting lever position signal, a speed signal and a wheel speed direction signal provided by a wheel speed sensor of the ABS are adopted, and further, the running direction of the automobile can be determined without any loss, and basic automobile control such as gear selection, torque matching and the like can be carried out. The invention can obviously reduce the cost of extra hardware, can effectively solve the problem that the vehicle cannot judge the speed direction after one or more of the wheel speed direction signals fail, and can also avoid the problem of misdiagnosis of the speed direction on steep slopes or ice and snow roads due to wheel skidding.
Description
Technical Field
The invention relates to the field of vehicle control, in particular to a vehicle speed direction detection method for an automatic transmission vehicle.
Background
Automobile is a part of daily life and is more and more closely related to people, and particularly in the present day, problems such as road congestion, driving comfort and safety in running are highlighted along with the rapid increase of the holding quantity of automobiles, so that automatic automobile stopping becomes an essential option for more and more users to purchase automobiles.
The automatic transmission vehicle uses a vehicle speed direction signal as a basic signal for representing the motion state of the vehicle, and the automatic transmission vehicle influences gear control, clutch torque control and the like of the automatic transmission, so that the vehicle motion control is greatly influenced.
In the prior art, there are two general means for acquiring a vehicle speed direction signal:
first, on the automatic gearbox installed with output shaft rotation speed sensor, the rotation speed of the output shaft is consistent with the speed direction of the vehicle, so the sensor can be used to directly obtain the speed direction signal;
Secondly, on an automobile with an ABS function, the wheel speed direction obtained from the wheel speed sensor of each wheel is directly used and is used as a vehicle speed direction signal after being processed by an algorithm in the TCU;
in the practical application process, the vehicle speed direction signal has a larger influence on gear control of the gearbox and the like, so that the reliability of the system is improved by combining the two types.
However, the following drawbacks need to be solved in the prior art:
1. the speed sensor of the output shaft of the gearbox is used, and additional design cost, production cost, maintenance cost and product cost are required to be increased.
2. Depending on the wheel speed direction sensor signals, if one or more of the wheel speed direction signals fail or wheels slip on steep slopes or ice and snow roads, misjudgment of the vehicle speed direction is easy to occur, and the running safety is seriously affected.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for detecting a vehicle speed direction of an automatic transmission vehicle, so as to solve the problems of high cost, misjudgment and misdiagnosis caused by a sensor in the prior art.
The technical scheme adopted by the invention is as follows:
A vehicle speed direction detection method for an automatic transmission vehicle, comprising:
detecting a gear level position signal, a vehicle speed signal and a wheel speed sensor signal of an anti-lock braking system in real time in the running process of a vehicle;
When the position signal of the gear level is detected to be in a preset forward gear, judging that the current vehicle speed direction signal is in a forward direction;
When the position signal of the gear shifting lever is detected to be in the reverse gear, judging that the current vehicle speed direction signal is in the reverse direction;
When the gear level position signal is detected to be in the neutral position and the vehicle speed is greater than a preset first vehicle speed threshold value, the current vehicle speed direction signal is kept consistent with a wheel speed direction signal provided by a wheel speed sensor of an anti-lock system.
In at least one possible implementation manner, when the forward direction is determined, the preset vehicle speed direction signal value is set to +1 synchronously; when the reverse direction is determined, the synchronization sets the preset vehicle speed direction signal value to-1.
In at least one possible implementation manner, after determining the forward direction, if it is detected that the shift lever position signal is changed from the forward gear to a neutral gear and the vehicle speed is smaller than a preset second vehicle speed threshold value, the vehicle speed direction signal value is changed from +1 to an initial value of 0.
In at least one possible implementation manner, after determining the forward direction, if it is detected that the shift lever position signal is changed from the forward gear to the reverse gear and the vehicle speed is smaller than a preset third vehicle speed threshold value, the vehicle speed direction signal value is changed from +1 to-1.
In at least one possible implementation manner, after determining the reverse direction, if it is detected that the shift lever position signal is changed from the reverse gear to the neutral gear and the vehicle speed is smaller than a preset second vehicle speed threshold value, the vehicle speed direction signal value is changed from-1 to an initial value of 0.
In at least one possible implementation manner, after determining the reverse direction, if it is detected that the shift lever position signal is changed from the reverse gear to the forward gear and the vehicle speed is smaller than a preset third vehicle speed threshold value, the vehicle speed direction signal value is changed from-1 to +1.
In at least one possible implementation manner, after the current vehicle speed direction signal is determined according to the wheel speed direction signal, if the detected vehicle speed is smaller than a preset second vehicle speed threshold value, the current vehicle speed direction signal value is set to be an initial value of 0, wherein the second vehicle speed threshold value is smaller than the first vehicle speed threshold value.
In at least one possible implementation manner, after the current vehicle speed direction signal is determined according to the wheel speed direction signal, if the shift lever position signal is detected to be changed from the neutral position to the non-neutral position and the vehicle speed is smaller than a preset second vehicle speed threshold value, the current vehicle speed direction signal value is set to be an initial value of 0.
In at least one possible implementation thereof, the maintaining of the coincidence with the wheel speed direction signal provided by the wheel speed sensor of the anti-lock braking system includes: and the sum of the left wheel speed direction signal and the right wheel speed direction signal is kept consistent.
In at least one possible implementation, the forward gear includes any one of the following: drive gear, overdrive gear, manual gear.
The main design concept of the invention is that on an automatic gear automobile, a gear lever belongs to basic standard, and meanwhile, the safety ABS system is considered as a mandatory configuration item required by regulations, so that on the premise of not increasing any cost, namely, on the premise of discarding adding an additional rotating speed sensor, the current automobile speed direction can be reliably and accurately judged only by a gear lever position signal, an automobile speed signal and an automobile speed direction signal provided by an ABS wheel speed sensor, and the running direction of the automobile can be determined without any loss, and thus, the basic automobile control such as gear selection, torque matching and the like can be carried out. The invention can obviously reduce the cost of extra hardware, can effectively solve the problem that the vehicle cannot judge the speed direction after one or more of the wheel speed direction signals fail, and can also avoid the problem of misdiagnosis of the speed direction on steep slopes or ice and snow roads due to wheel skidding.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
Fig. 1 is a flowchart of a method for detecting a vehicle speed direction of an automatic transmission vehicle according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The invention provides an embodiment of a speed direction detection method for an automatic transmission automobile, specifically, as shown in fig. 1, the method comprises the following steps:
step S1, detecting a gear level position signal, a vehicle speed signal and a wheel speed sensor signal of an anti-lock braking system in real time in the running process of a vehicle;
step S21, when the position signal of the gear level is detected to be in a preset forward gear, judging that the current vehicle speed direction signal is in a forward direction;
S22, when the position signal of the gear level is detected to be in the reverse gear, judging that the current vehicle speed direction signal is in the backward direction;
And S23, when the gear level position signal is detected to be in the neutral gear position and the vehicle speed is greater than a preset first vehicle speed threshold value, enabling the current vehicle speed direction signal to be consistent with a wheel speed direction signal provided by a wheel speed sensor of an anti-lock braking system.
Further, when the forward direction is determined, the preset vehicle speed direction signal value is set to +1 synchronously; when the reverse direction is determined, the synchronization sets the preset vehicle speed direction signal value to-1.
Further, after determining the forward direction, if it is detected that the shift lever position signal is changed from the forward gear to a neutral gear and the vehicle speed is smaller than a preset second vehicle speed threshold value, the vehicle speed direction signal value is changed from +1 to an initial value of 0.
Further, after determining the forward direction, if it is detected that the shift lever position signal is changed from the forward gear to the reverse gear and the vehicle speed is smaller than a third vehicle speed threshold value, the vehicle speed direction signal value is changed from +1 to-1.
Further, after determining the reverse direction, if it is detected that the shift lever position signal is changed from the reverse gear to the neutral gear and the vehicle speed is smaller than a preset second vehicle speed threshold value, the vehicle speed direction signal value is changed from-1 to an initial value of 0.
Further, after determining the reverse direction, if it is detected that the shift lever position signal is changed from the reverse gear to the forward gear and the vehicle speed is smaller than a third vehicle speed threshold value, the vehicle speed direction signal value is changed from-1 to +1.
Further, after the current vehicle speed direction signal is judged according to the wheel speed direction signal, if the detected vehicle speed is smaller than a second vehicle speed threshold value, the current vehicle speed direction signal value is set to be an initial value of 0, wherein the second vehicle speed threshold value is smaller than the first vehicle speed threshold value.
Further, after the current vehicle speed direction signal is determined by the wheel speed direction signal, if the shift lever position signal is detected to be changed from the neutral position to the non-neutral position and the vehicle speed is smaller than the second vehicle speed threshold value, the current vehicle speed direction signal value is set to an initial value of 0.
Further, the maintaining of the coincidence with the wheel speed direction signal provided by the wheel speed sensor of the anti-lock braking system includes: and the sum of the left wheel speed direction signal and the right wheel speed direction signal is kept consistent.
Further, the forward gear includes any one of the following: a driving gear (D), a overtaking gear (S) and a manual gear (M).
In summary, the main design concept of the present invention is that, on an automatic transmission automobile, the gear shift lever belongs to basic standard, and the ABS system is considered to be a mandatory configuration item required by regulations, so that the present vehicle speed direction can be reliably and accurately determined only by the gear shift lever position signal, the vehicle speed signal and the wheel speed direction signal provided by the wheel speed sensor of the ABS without increasing any cost, i.e. without adding an additional rotation speed sensor, and further, the running direction of the vehicle can be determined without any loss, and thus, the basic vehicle control such as gear selection and torque matching can be performed. The invention can obviously reduce the cost of extra hardware, can effectively solve the problem that the vehicle cannot judge the speed direction after one or more of the wheel speed direction signals fail, and can also avoid the problem of misdiagnosis of the speed direction on steep slopes or ice and snow roads due to wheel skidding.
In the embodiments of the present invention, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The construction, features and effects of the present invention are described in detail according to the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention, and it should be understood that the technical features of the above embodiment and the preferred mode thereof can be reasonably combined and matched into various equivalent schemes by those skilled in the art without departing from or changing the design concept and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, but is intended to be within the scope of the invention as long as changes made in the concept of the invention or modifications to the equivalent embodiments do not depart from the spirit of the invention as covered by the specification and drawings.
Claims (8)
1. A vehicle speed direction detection method for an automatic transmission vehicle, comprising:
detecting a gear level position signal, a vehicle speed signal and a wheel speed sensor signal of an anti-lock braking system in real time in the running process of a vehicle;
When the position signal of the gear level is detected to be in a preset forward gear, judging that the current vehicle speed direction signal is in a forward direction;
When the position signal of the gear shifting lever is detected to be in the reverse gear, judging that the current vehicle speed direction signal is in the reverse direction;
When the gear level position signal is detected to be in the neutral position and the vehicle speed is greater than a preset first vehicle speed threshold value, the current vehicle speed direction signal is kept consistent with a wheel speed direction signal provided by a wheel speed sensor of an anti-lock system, and after that, if the gear level is detected to be changed from the neutral position to a non-neutral position and the vehicle speed is less than a preset second vehicle speed threshold value, the direction signal value of the current vehicle speed is set to be an initial value of 0 and the second vehicle speed threshold value is less than the first vehicle speed threshold value.
2. The vehicle speed direction detection method for an automatic transmission vehicle according to claim 1, wherein when it is determined that the forward direction is the forward direction, a preset vehicle speed direction signal value is set to +1 in synchronization; when the reverse direction is determined, the synchronization sets the preset vehicle speed direction signal value to-1.
3. The method according to claim 2, wherein after determining a forward direction, if it is detected that a shift lever position signal is changed from a forward gear to a neutral gear and a vehicle speed is less than a preset second vehicle speed threshold value, the vehicle speed direction signal value is changed from +1 to an initial value of 0.
4. The method according to claim 2, wherein after determining a forward direction, if it is detected that a shift lever position signal is changed from the forward gear to a reverse gear and a vehicle speed is less than a preset third vehicle speed threshold value, the vehicle speed direction signal value is changed from +1 to-1.
5. The method according to claim 2, wherein after determining a reverse direction, if it is detected that a shift lever position signal is changed from the reverse gear to a neutral gear and a vehicle speed is less than a preset second threshold value, the vehicle speed direction signal value is changed from-1 to an initial value of 0.
6. The method according to claim 2, wherein after determining a reverse direction, if it is detected that a shift lever position signal is changed from the reverse gear to the forward gear and a vehicle speed is less than a preset third vehicle speed threshold value, the vehicle speed direction signal value is changed from-1 to +1.
7. The method for detecting a vehicle speed direction of an automatic transmission according to any one of claims 1 to 6, wherein the maintaining of the coincidence with the wheel speed direction signal provided by the wheel speed sensor of the antilock brake system includes: and the sum of the left wheel speed direction signal and the right wheel speed direction signal is kept consistent.
8. The vehicle speed direction detection method for an automatic transmission vehicle according to any one of claims 1 to 6, wherein the forward gear includes any one of: drive gear, overdrive gear, manual gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111522208.6A CN114148334B (en) | 2021-12-13 | 2021-12-13 | Speed direction detection method for automatic transmission automobile |
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|---|---|---|---|
| CN202111522208.6A CN114148334B (en) | 2021-12-13 | 2021-12-13 | Speed direction detection method for automatic transmission automobile |
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| CN114148334A CN114148334A (en) | 2022-03-08 |
| CN114148334B true CN114148334B (en) | 2024-04-19 |
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| CN202111522208.6A Active CN114148334B (en) | 2021-12-13 | 2021-12-13 | Speed direction detection method for automatic transmission automobile |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114148334A (en) | 2022-03-08 |
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