CN104633089B - The shift control method of automatic transmission, system and vehicle - Google Patents

Abstract

The present invention provides a shift control method, system and vehicle of an automatic transmission. The method includes: when the initial shift control pressure controls the automatic transmission to upshift, detect the actual time elapsed from the start of the upshift to the drop of the preset speed of the turbine speed. Time T1; compare T1 with the standard time T2 elapsed from the start of upshifting of the automatic transmission to the preset speed of the turbine speed drop; if the difference between T1 and T2 exceeds the allowable range of error, the initial shift is further based on the difference between T1 and T2 The control pressure is adjusted, wherein the greater the difference, the greater the adjusted shift control pressure. The gear shift control method of the automatic transmission of the present invention can reduce or avoid the gear shift impact, make the gear shift more smooth, reduce or even eliminate the frustration when shifting gears, and improve ride comfort.

Description

Shift control method, system and vehicle of automatic transmission

technical field

The invention relates to the technical field of automobiles, in particular to a shift control method, system and vehicle of an automatic transmission.

Background technique

At present, due to differences in manufacturing tolerances of automatic transmissions, the calibrated shift control pressure in vehicles is a standard value, for example, obtained from an automatic transmission with a tolerance in the middle position. Therefore, due to differences in manufacturing tolerances of automatic transmissions, it often occurs that the shift control pressure calibrated by the software does not match the hardware specifications of the automatic transmission, resulting in a shocking feeling when shifting gears and causing customer complaints.

Contents of the invention

In view of this, the present invention aims to propose a shift control method for an automatic transmission, which can reduce or avoid shift shocks, make shifting smoother, reduce or even eliminate the sense of frustration during shifting, and improve ride comfort .

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A gear shift control method for an automatic transmission, comprising the following steps: when the initial gear shift control pressure controls the automatic transmission to upshift, detect the actual time T1 from the start of the upshift to the drop of the preset speed of the turbine speed; compare the T1 and The standard time T2 elapsed from the start of upshifting of the automatic transmission to the decrease of the preset speed of the turbine speed; if the difference between T1 and T2 exceeds the allowable range of error, the initial gear shift is further performed according to the difference between T1 and T2 The control pressure is adjusted, wherein the greater the difference, the greater the adjusted shift control pressure.

Further, the adjusting the initial shift control pressure according to the difference between T1 and T2 further includes: adjusting the initial shift control pressure according to the difference-pressure adjustment value mapping table, wherein the adjustment The subsequent shift control pressure = the initial shift control pressure + the pressure adjustment value.

Further, the mapping table of the difference-pressure adjustment value is obtained according to the test calibration.

Further, the preset rotational speed is 50 rpm, and the allowable error range is [-40, 40] milliseconds.

Compared with the prior art, the shift control method of the automatic transmission of the present invention has the following advantages:

In the shift control method of the automatic transmission according to the present invention, the initial shift control pressure is corrected according to the difference between the actual time T1 and the standard time T2 elapsed from the start of the automatic transmission upshift to the turbine speed drop preset speed, so that Addresses shift shock caused by mismatch between automatic transmission manufacturing tolerances and software calibrated initial shift control pressure. Make the gear shift more smoothly, reduce or even eliminate the frustration when shifting gears, and improve ride comfort.

Another object of the present invention is to propose a shift control system of an automatic transmission, which can reduce or avoid shift shock, make shift more smoothly, and reduce or even eliminate the sense of frustration when shifting , to improve ride comfort.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A shift control system of an automatic transmission, comprising: a detection module, used to detect the actual time T1 elapsed from the start of the upshift to the drop of the preset speed of the turbine speed when the initial shift control pressure is used to control the upshift of the automatic transmission; A module for comparing the T1 with the standard time T2 from the start of upshifting of the automatic transmission to the preset speed of the turbine speed drop; an adjustment module for judging in the comparison module that the difference between T1 and T2 exceeds the allowable error range, the initial shift control pressure is adjusted according to the difference between T1 and T2, wherein the greater the difference, the greater the adjusted shift control pressure.

Further, the adjustment module is configured to: adjust the initial shift control pressure according to the mapping table of difference-pressure adjustment value, wherein, the adjusted shift control pressure=the initial shift control pressure+the The above pressure adjustment value.

Further, the mapping table of the difference-pressure adjustment value is obtained according to the test calibration.

Further, the preset rotational speed is 50 rpm, and the allowable error range is [-40, 40] milliseconds.

The shift control system of the automatic transmission has the same advantages as the above-mentioned shift control method of the automatic transmission over the prior art, and will not be repeated here.

Another object of the present invention is to provide a vehicle, which has the advantages of smoother gear shifting, reducing or even eliminating the sense of frustration during gear shifting, and improving ride comfort.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A vehicle is provided with the shift control system of an automatic transmission as described in the above embodiments.

The vehicle described above has the same advantages as the above-mentioned gear shift control system of the automatic transmission over the prior art, and will not be repeated here.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the flow chart of the shift control method of the automatic transmission described in the embodiment of the present invention;

Fig. 2 is a detailed flowchart of the shift control method of the automatic transmission described in the embodiment of the present invention; and

Fig. 3 is a structural block diagram of the shift control system of the automatic transmission according to the embodiment of the present invention.

Explanation of reference signs:

T1-actual time, T2-standard time, 300-shift control system of automatic transmission, 310-detection module, 320-comparison module, 330-adjustment module.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

FIG. 1 is a flowchart of a shift control method of an automatic transmission according to an embodiment of the present invention. As shown in Figure 1, the shift control method of an automatic transmission according to an embodiment of the present invention includes the following steps:

Step S101: When the automatic transmission is controlled by the initial shift control pressure to upshift, detect the actual time T1 elapsed from the start of the upshift to the decrease of the turbine speed to the preset speed. In one embodiment of the present invention, the preset rotation speed is but not limited to: 50rmp.

Ideally, the initial shift control pressure of the same automatic transmission on the same vehicle is the same, which has been calibrated on the vehicle in advance. Therefore, under the same working conditions, the above-mentioned automatic transmission starts from upshift to turbo The actual time T1 elapsed for the speed to drop to the preset speed should be the same (that is, ideally the same as the standard time T2), but due to various factors, such as the tolerance of the automatic transmission is different, in actual situations, the automatic transmission is determined by The actual time T1 elapsed from the start of the upshift to the decrease of the turbine speed to the preset speed is not necessarily the same.

Step S102: Comparing T1 with the standard time T2 elapsed from the start of the upshift of the automatic transmission to the decrease of the turbine speed to the preset speed.

Step S103: If the difference between T1 and T2 exceeds the allowable range of error, further adjust the initial shift control pressure according to the difference between T1 and T2, wherein the greater the difference, the greater the adjusted shift control pressure.

Due to differences in the tolerances of automatic transmissions, the actual time T1 is different from the standard time T2 under the same initial shift control pressure. The greater the actual time T1, the higher the initial shift control pressure for this automatic transmission. Therefore, in order to make the actual time T1 close to the standard time T2, it is necessary to increase the shift control pressure, and the greater the actual time T1, the greater the increase in the shift control pressure; on the contrary, the smaller the actual time T1, the greater the shift control pressure. The range of the gear control pressure reduction should be larger, so that T1 can be close to T2.

In an embodiment of the present invention, the allowable error range is but not limited to: [-40, 40] milliseconds. Further, the initial shift control pressure is adjusted according to the difference between T1 and T2, including:

The initial shift control pressure is adjusted according to the mapping table of difference-pressure adjustment value, wherein the adjusted shift control pressure=initial shift control pressure+pressure adjustment value. Wherein, the mapping table of difference value-pressure adjustment value can be pre-calibrated and obtained according to the test. As shown in Table 1, a mapping table of the difference-pressure adjustment value obtained according to the test under a certain working condition is shown.

Table 1

Difference (ms) -300 -200 -100 -70 -40 40 100 200 300 400 Pressure adjustment value (bar) -0.2 -0.15 -0.1 -0.05 0 0 0.05 0.1 0.15 0.2

As shown in Table 1, [-40, 40] milliseconds is within the allowable range, so there is no need to adjust the initial shift control pressure. If the difference between T1 and T2 is -300 milliseconds, the initial shift control pressure needs to be reduced by 0.2 bar, and so on, the greater the difference, the greater the adjusted shift control pressure.

As a specific example, the shift control method for an automatic transmission in the embodiment of the present invention can calibrate the initial shift control pressure for a brand new automatic transmission. Specifically, as shown in Fig. 2, the automatic transmission in the middle position is firstly used for calibration, and the time from the start of shifting to the turbine speed dropping by 50 rpm is calibrated for different working conditions. Obtain the standard control pressure applicable to the automatic transmission in the middle position under different working conditions, and record the standard of 1 liter 2, 2 liter 3, 3 liter 4, 4 liter 5, 5 liter 6 from the start of shifting until the turbine speed drops by 50rpm Time T2.

For example, if the manufacturing tolerance range of an automatic transmission is 60-100, then the automatic transmission in the middle position can be the automatic transmission corresponding to the average value of the tolerance upper limit and the tolerance lower limit, such as an automatic transmission with a tolerance of 80 as the automatic transmission in the middle position.

Then further according to the test, when the automatic transmission corresponding to multiple tolerances within the tolerance range is shifted, the time from the start of the shift to the 50rpm drop of the turbine speed reaches T2, thereby obtaining the shift control pressure of the automatic transmission with different tolerances, and then being able to Obtain a table corresponding to the time difference between T1 and T2 and the control pressure during different shifts (such as 1-2, 2-3, 3-4, 4-5, 5-6), that is, the mapping table of difference-pressure adjustment value.

It is detected whether the currently executed gearshift is the first gearshift in the life cycle of the transmission (that is, whether it is a brand new automatic transmission). If it is, start to detect the time from the start of gear shifting to the time when the turbine speed drops by 50rpm in the subsequent shifting process and record it as T1, and use T1-T2 to obtain the difference.

Combining with Table 1, it can be seen that if |T1-T2|>40ms, then increase or decrease the corresponding table according to the already set time difference between T1 and T2 and the control pressure (that is, the mapping table of difference-pressure adjustment value). block control pressure. And continue to detect the time from the start of shifting to the time when the turbine speed drops by 50rpm in the next shift, and then calculate the difference with T2 time, and repeat the execution several times until |T1-T2|≤40ms or exceeds the predetermined number of executions, for example 5 times. If |T1-T2|≤40ms, shift gears according to the current shift control pressure.

According to the shift control method of the automatic transmission according to the embodiment of the present invention, the initial shift control pressure is corrected according to the difference between the actual time T1 and the standard time T2 elapsed from the start of the automatic transmission upshift to the decrease of the preset speed of the turbine speed, Therefore, the shift shock caused by the mismatch between the manufacturing tolerance of the automatic transmission and the initial shift control pressure calibrated by the software is solved. Make the gear shift more smoothly, reduce or even eliminate the frustration when shifting gears, and improve ride comfort.

FIG. 3 is a structural block diagram of a shift control system of an automatic transmission according to an embodiment of the present invention. As shown in FIG. 3 , a shift control system 300 of an automatic transmission according to an embodiment of the present invention includes: a detection module 310 , a comparison module 320 and an adjustment module 330 .

Wherein, the detection module 310 is used for detecting the actual time T1 elapsed from the start of upshifting to the decrease of the turbine speed to the preset speed when the automatic transmission is controlled to upshift by the initial shift control pressure. The comparison module 320 is used to compare T1 with the standard time T2 elapsed from the start of upshifting of the automatic transmission to the decrease of the turbine speed to a preset speed. The adjustment module 330 is used to adjust the initial shift control pressure according to the difference between T1 and T2 when the comparison module judges that the difference between T1 and T2 exceeds the allowable range of error. The greater the pressure.

In an embodiment of the present invention, the adjustment module 330 is configured to: adjust the initial shift control pressure according to the mapping table of difference-pressure adjustment value, wherein, the adjusted shift control pressure=initial shift control pressure+ Pressure adjustment value. Further, the mapping table of the difference-pressure adjustment value is obtained according to the test calibration.

In an embodiment of the present invention, the preset rotational speed is 50 rpm, and the allowable error range is [-40, 40] milliseconds.

According to the shift control system of the automatic transmission of the embodiment of the present invention, the initial shift control pressure is corrected according to the difference between the actual time T1 and the standard time T2 elapsed from the start of the automatic transmission upshift to the turbine speed falling to the preset speed, Therefore, the shift shock caused by the mismatch between the manufacturing tolerance of the automatic transmission and the initial shift control pressure calibrated by the software is solved. Make the gear shift more smoothly, reduce or even eliminate the frustration when shifting gears, and improve ride comfort.

It should be noted that the specific implementation of the shift control system of the automatic transmission in the embodiment of the present invention is similar to the specific implementation of the shift control method of the automatic transmission in the embodiment of the present invention. For details, please refer to the description of the method part. In order to reduce Redundant, do not repeat them.

Further, the present invention discloses a vehicle, which is provided with the shift control system of the automatic transmission as described in the above embodiments. The vehicle has the advantages of smoother gear shifting, reducing or even eliminating the frustration when shifting gears, and improving ride comfort.

In addition, other configurations and functions of the vehicle according to the embodiments of the present invention are known to those skilled in the art, and will not be repeated in order to reduce redundancy.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (9)

1. a kind of shift control method of automatic transmission, it is characterised in that comprise the following steps：

During by initial gearshift control pressure control automatic transmission upshift, detection upshift starts to secondary speed to decline default turning T1 actual time passed through by speed；

The comparison T1 and automatic transmission upshift start to secondary speed to decline the standard time T2 passed through by preset rotation speed；

If the difference of the T1 and T2 exceeds error allowed band, further according to the difference of the T1 and T2 to initial The gearshift control pressure is adjusted, and wherein, the difference is bigger, and the gearshift control pressure after adjustment is bigger.

2. the shift control method of automatic transmission according to claim 1, it is characterised in that described according to T1's and T2 Difference is adjusted to the initial shift control pressure, is further included：

Mapping table according to difference-pressure adjusted value is adjusted to the initial gearshift control pressure, wherein, after adjustment The gearshift control pressure+pressure the adjusted value of gearshift control pressure=initial.

3. the shift control method of automatic transmission according to claim 2, it is characterised in that the difference-pressure is adjusted The mapping table of whole value is obtained according to Experimental Calibration.

4. the shift control method of the automatic transmission according to any one of claim 1-3, it is characterised in that described default Rotating speed is 50rmp, and the error allowed band is [- 40,40] millisecond.

5. a kind of shifting control system of automatic transmission, it is characterised in that include：

Detection module, for, when with initial gearshift control pressure control automatic transmission upshift, detection upshift starts to whirlpool Wheel speed declines T1 actual time passed through by preset rotation speed；

Comparison module, starts to secondary speed to decline what preset rotation speed was passed through for the comparison T1 and automatic transmission upshift Standard time T2；

Adjusting module, during for judging that in the comparison module difference of the T1 and T2 exceeds error allowed band, according to institute The difference for stating T1 and T2 is adjusted to the initial gearshift control pressure, and wherein, the difference is bigger, the gearshift after adjustment Control pressure is bigger.

6. the shifting control system of automatic transmission according to claim 5, it is characterised in that the adjusting module is used In：

Mapping table according to difference-pressure adjusted value is adjusted to the initial gearshift control pressure, wherein, after adjustment The gearshift control pressure+pressure the adjusted value of gearshift control pressure=initial.

7. the shifting control system of automatic transmission according to claim 6, it is characterised in that the difference-pressure is adjusted The mapping table of whole value is obtained according to Experimental Calibration.

8. the shifting control system of the automatic transmission according to any one of claim 5-7, it is characterised in that described default Rotating speed is 50rmp, and the error allowed band is [- 40,40] millisecond.

9. a kind of vehicle, it is characterised in that the gearshift just like the automatic transmission described in any one of claim 5-8 is set and is controlled System.