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Brake-on-brake downshift control method for six-speed wet dual-clutch automatic transmission

A wet dual-clutch, automatic transmission technology, applied in transmission control, elements with teeth, belts/chains/gears, etc., can solve clutch slippage and clutch overheating, no multi-gear downshift clutch control strategy, etc. problems, to prevent the clutch from overheating, the torque exchange process is smooth, and the temperature rises slowly

Active Publication Date: 2017-11-17
SHANGHAI AUTOMOBILE GEAR WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology does not have a multi-speed downshift clutch control strategy, and it is easy to cause clutch slipping and clutch overheating during downshifting

Method used

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  • Brake-on-brake downshift control method for six-speed wet dual-clutch automatic transmission
  • Brake-on-brake downshift control method for six-speed wet dual-clutch automatic transmission
  • Brake-on-brake downshift control method for six-speed wet dual-clutch automatic transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides that the emergency braking of 4 gears causes the target gear to change continuously by 3-2, and the final target gear is determined to be 2, which is an even-numbered gear down. Such as image 3 with Figure 4 shown.

[0038] Table 1 Downshift point of each gear under different acceleration

[0039]

[0040] In Table 1: V_Down[1] is the shift point of 2 down 1, V_Down[2] is the shift point of 3 down 2, V_Down[3] is the shift point of 4 down 3, V_Down[5] is 5 down The shift point of 4, V_Down[6] is the shift point of 6 down 5. When the vehicle speed is less than V_Down, the target gear is updated.

[0041] Refer to the shift diagram in Table 1 and Figure 4 The actual vehicle data, the specific steps of this embodiment are as follows:

[0042]1) Real-time monitoring of brake pressure signal (BrakePressureHSC), engine speed (EngineSpeedHSC), odd input shaft speed (NIn1), even input shaft speed (NIn2), vehicle speed signal (VehiclSpeedHSC)...

Embodiment 2

[0047] This embodiment provides that the emergency braking of 5 gears causes the target gear to change continuously by 5-4-3-2, and the final target gear is determined to be 2, which is an odd number of gears down. Such as figure 2 and Figure 5 , with reference to the shift diagram in Table 1, the specific implementation steps are as follows:

[0048] 1) Real-time monitoring of brake pressure signal (BrakePressureHSC), engine speed (EngineSpeedHSC), odd input shaft speed (NIn1), even input shaft speed (NIn2), vehicle speed signal (VehiclSpeedHSC), acceleration signal (Vehicle_acc_Filt), actual gear signal ( GearActualHSC), target gear (GearTargetHSC), odd clutch state (Sate_Tc1), even clutch state (Sate_Tc2), such as Figure 5 shown.

[0049] 2) Normal driving reaches the 5th gear, the vehicle speed reaches 46.9km / h, loosen the accelerator, step on the brake pedal so that the brake pressure is 31.7bar (such as Figure 5 1m50.6s), when the vehicle speed is 43.53km / h, the ...

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Abstract

The invention discloses a braking downshifting control method for an automatic six-speed wet type double-clutch transmission. The braking downshifting control method for the automatic six-speed wet type double-clutch transmission comprises the steps that a driving intention is judged rapidly by monitoring the traveling state in real time, and the target accelerated speed is worked out; and then the target gear is updated in real time by checking a gear graph, whether the downshifting type refers to that an odd number of gears need to be reduced or that an even number of gears need to be reduced is determined according to the target gear, so that corresponding single-gear downshifting or multi-gear downshifting is controlled. According to the braking downshifting control method for the automatic six-speed wet type double-clutch transmission, in order to guarantee smooth downshifting of a vehicle, multi-gear downshifting in a repeated-braking downshifting strategy is developed based on the structural characteristics of a wet clutch and is verified in real vehicles.

Description

technical field [0001] The invention relates to a technology in the field of automobile automation control, in particular to a method for controlling downshifts by braking on a six-speed wet dual-clutch automatic transmission. Background technique [0002] DCT (Dual Clutch Transmission, dual clutch transmission) is an automatic transmission that uses TCU and valve body instead of manual shift lever on the basis of MT, and selects two clutches to control power transmission to ensure uninterrupted power. The tacit cooperation between the two clutches and the improvement of vehicle ride comfort and power require a high-precision control strategy. During the driving process of the vehicle, we often encounter many unexpected situations and need to take emergency braking to avoid danger. How to stop the vehicle quickly and smoothly is the focus of research. The weight of the brake pedal is a difficult point for the selection of the downshift type. If the downshift type is not sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H61/04F16H61/06F16H59/44F16H59/42F16H59/56F16H59/70F16H59/14F16H59/18
CPCF16H59/14F16H59/18F16H59/42F16H59/44F16H59/56F16H59/70F16H61/02F16H61/06F16H2061/0096F16H2061/0459
Inventor 吕俊磊李欢讯唐莹杭宇喆
Owner SHANGHAI AUTOMOBILE GEAR WORKS
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