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Shift control method of hybrid electric vehicle based on multi-mode brake

A technology of hybrid electric vehicles and control methods, applied in hybrid electric vehicles, motor vehicles, transportation and packaging, etc., can solve problems affecting vehicle dynamics and economy, increase the complexity of hydraulic systems, etc., and solve the problem of speed control conflicts , shorten shift time, simple control effect

Active Publication Date: 2020-08-28
江西鼎盛新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the running of the vehicle, the multi-mode brakes are not used, but other clutches and brakes are used to shift gears. This method not only adds additional brakes and increases the complexity of the hydraulic system, but also does not maximize the use of multi-mode brakes. The role of being able to carry a large torque affects the power and economy of the vehicle

Method used

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  • Shift control method of hybrid electric vehicle based on multi-mode brake
  • Shift control method of hybrid electric vehicle based on multi-mode brake

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A shift control method for a hybrid electric vehicle based on a multi-mode brake, the control flow chart of which is as follows figure 2 As shown, when the vehicle is running at a hybrid low speed and the second clutch C1 is locked, according to the vehicle's current accelerator pedal and vehicle speed signals received by the vehicle controller, it is determined whether the user needs to perform a rapid acceleration operation, and if so, press Follow these steps:

[0025] S1: The vehicle controller sends the preset oil pump motor speed request threshold A to the oil pump motor controller through the CAN bus, and the oil pump motor controller controls the oil pump motor to rapidly increase the speed to the preset oil pump motor speed request threshold A, and then execute step S2 ; Wherein, the preset oil pump motor speed request threshold A is 1500rpm;

[0026] S2: The vehicle controller cancels the current of the negative lock valve of the multi-mode brake B1, control...

Embodiment 2

[0032] A method for shifting control of a hybrid electric vehicle based on a multi-mode brake, the steps of which are basically the same as the steps of the method for controlling shifting of a hybrid electric vehicle based on a multi-mode brake in Embodiment 1, the difference being: step S1 , the preset oil pump motor speed request threshold A is 1200rpm; in step S3, the preset first planetary carrier speed threshold B is 150rpm; in step S4, the preset speed C is 350rad / s 2 , the preset speed threshold D of the first planetary carrier is 40rpm; in step S5, the preset speed E is 150rad / s 2 , the preset rotational speed threshold F of the first planet carrier is 20 rpm.

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Abstract

The invention provides a hybrid electric vehicle gear-shifting control method based on a multi-mode brake. The rotation speed of an oil pump motor is increased to A, the current of a negative lockup valve of the multi-mode brake is removed, the multi-mode brake is controlled to be in a two-way free state, then the torque of a small motor and the torque of a large motor are increased, the rotationspeed of a first planet carrier is quickly increased to B, then the current of a positive lockup valve of the multi-mode brake is increased, the multi-mode brake is controlled to be in a reverse locking state, meanwhile, the torque of the small motor and the torque of the large motor are controlled, the rotation speed of the first planet carrier is reduced to be lower than D according to the preset speed C and then reduced to be lower than F according to the preset speed E, finally the torque of an engine and the torque of the large motor are increased, the first planet carrier is locked by the reversely-locking multi-mode brake, and gear shifting is achieved. By the adoption of the method, the problem of impact of gear shifting in the advancing process can be effectively solved, the roleof the multi-mode brake is played, the whole vehicle torque responding time is shortened, and the whole vehicle smoothness is greatly improved.

Description

technical field [0001] The invention relates to the control field of hybrid electric vehicles, in particular to a shift control method for hybrid electric vehicles based on multi-mode brakes. Background technique [0002] In the prior art, multi-mode brakes have a great influence on the smoothness of shifting. In order not to affect the smoothness, the use of multi-mode brakes in automatic transmissions is limited to forward gears, 1st gear starting and reverse gears. The mode switching of the multi-mode brake is completed under the condition of During the running of the vehicle, the multi-mode brakes are not used, but other clutches and brakes are used to shift gears. This method not only adds additional brakes and increases the complexity of the hydraulic system, but also does not maximize the use of multi-mode brakes. The role of being able to carry a large torque affects the power and economy of the vehicle. Contents of the invention [0003] Aiming at the defects of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W20/30
CPCB60W20/30B60W2710/10
Inventor 盖福祥钟发平张彤
Owner 江西鼎盛新材料科技有限公司
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