Shift control system and method for vehicle
A technology of shift control and vehicle controller, applied in the field of vehicle shift control system, can solve the problems of slipping, not smooth shifting, poor driving experience, etc., and achieve the effect of reducing synchronization difference and shortening synchronization time.
Active Publication Date: 2021-09-03
BYD CO LTD
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Problems solved by technology
The longer the motor speed regulation and synchronization time, the longer the power interruption time, and even slippery slopes may occur on steep slopes, the shifting is not smooth enough, and the driving experience is poor
Method used
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[0013] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0014] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0015] The present invention will be...
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The invention discloses a gear shift control method of a vehicle, comprising: a vehicle controller sends a gear shift request to a transmission control unit, the transmission control unit sends a target torque to a motor controller according to the gear shift request, and detects that the motor controller After the information of the completion of torque unloading sent by the vehicle controller, the gear selection actuator is controlled to select the gear position as neutral. When the gear position is detected to be in neutral gear, the transmission control unit calculates the speed required for the motor. Target speed, the target speed is determined according to the current vehicle speed and current vehicle acceleration. When the target speed and actual speed of the motor meet the preset conditions, the transmission control unit controls the gear selection actuator to shift gears, which can reduce the time required for gear shifting. The synchronization difference can shorten the synchronization time.
Description
technical field [0001] The invention belongs to the technical field of vehicles, and in particular relates to a vehicle gear shift control system and a method thereof. Background technique [0002] With the development of automobile technology, the control of all aspects of power vehicles is becoming more and more perfect, but there are still some problems. Among them, in terms of gear shift control of power vehicles, in the relevant prior art, since the gear shift process is in neutral after the speed regulation is completed, the motor is in a free state, that is, it rotates freely under the effect of resistance torque, and the synchronizer needs to complete the synchronous action. time. If the whole vehicle is on a slope or under braking conditions at this time, the synchronous target speed is always changing, but the actual motor speed has exited the speed regulation and cannot follow the target speed. For example, under severe working conditions, the speed change per s...
Claims
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IPC IPC(8): F16H61/02F16H61/04F16H61/32
CPCF16H61/02F16H61/04F16H61/32
Inventor 曾彬贺静谭先华
Owner BYD CO LTD