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A control method for the coordination between the engine and gear shift of a hybrid electric vehicle with a sliding start

A technology of a hybrid vehicle and a control method, which is applied to the arrangement of multiple different prime movers of a hybrid vehicle, a general power plant, and a motor vehicle, etc., can solve the problem of discontinuous sliding start of the hydraulic system, affecting the power and smoothness of the vehicle. To ensure the consistency of the transmitted torque direction, improve the starting jitter, and achieve the effect of good smoothness

Active Publication Date: 2019-07-19
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

However, the method of setting priority only arbitrates the strategy with low priority, and does not fundamentally solve the problem of conflict between starting the engine and shifting gears, and the hydraulic system does not continuously start the engine and operate the shifting elements by slipping, which is serious. Affects vehicle dynamics and ride comfort

Method used

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  • A control method for the coordination between the engine and gear shift of a hybrid electric vehicle with a sliding start
  • A control method for the coordination between the engine and gear shift of a hybrid electric vehicle with a sliding start
  • A control method for the coordination between the engine and gear shift of a hybrid electric vehicle with a sliding start

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Effect test

Embodiment 1

[0034] A control method for coordinating the engine and gear shifting of a hybrid vehicle with slip start, the overall control flow chart is as follows figure 2 As shown, when the vehicle is running at a purely electric low speed and the second brake B2 is locked, it is determined whether the user needs to perform a rapid acceleration operation based on the vehicle's current accelerator pedal, vehicle speed signal and battery power signal received by the vehicle controller , if so, the vehicle controller controls the second clutch C1 to start the engine and the small motor E1 to achieve gear shifting at the same time, until the first brake B1 is locked and the second clutch C1 is closed, and the vehicle is in a hybrid driving state;

[0035] A. Start the engine with the second clutch slipping according to the following steps:

[0036] S1: The vehicle controller sets the pressure regulating valve current of the second clutch C1 according to the pre-charging curve, controls the...

Embodiment 2

[0048] A control method for coordinating a slippery start engine of a hybrid electric vehicle and gear shifting, its steps are similar to those of the control method for a slippery start engine of a hybrid electric vehicle in embodiment 1 and a coordinated control method for shifting gears, the difference being that: In step S2, the preset engine fuel injection ignition speed threshold A is 500 rpm; in steps S5 and S6, the preset engine torque request threshold B is 10 Nm.

Embodiment 3

[0050] A control method for coordinating a slippery start engine of a hybrid electric vehicle and gear shifting, its steps are similar to those of the control method for a slippery start engine of a hybrid electric vehicle in embodiment 1 and a coordinated control method for shifting gears, the difference being that: In step S2, the preset engine fuel injection ignition speed threshold A is 450rpm; in steps S5 and S6, the preset engine torque request threshold B is 7.5Nm.

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Abstract

The invention provides a hybrid electric vehicle sliding friction engine starting and gear shifting cooperation control method. When a vehicle is in a pure-electric low-speed traveling state and a second brake (B2) is locked, whether a user needs to conduct urgent acceleration operation or not is judged, if the user needs to conduct urgent acceleration operation, operation that a vehicle control unit controls a second clutch (C1) to start an engine in a sliding friction mode and operation that the gear of a small motor (E1) is shifted are conducted at the same time until a first brake (B1) islocked and the second clutch (C1) is closed, and the vehicle is in a hybrid power drive traveling state. By the adoption of the method, the problem of the conflict between sliding friction engine starting and gear shifting can be effectively solved, the response time of the torque of the whole vehicle is shortened, the power performance and the smoothness performance of the whole vehicle are greatly improved, and the driving and taking comfort level of the whole vehicle is improved.

Description

technical field [0001] The invention relates to the control field of a hybrid electric vehicle, in particular to a control method for coordinating a sliding start engine and gear shifting of a hybrid electric vehicle. Background technique [0002] With the growth of population and economy, energy and environmental issues have prompted countries to develop new energy vehicles, energy-saving and environment-friendly vehicles. Hybrid electric vehicles are energy-saving and environmentally friendly, and have a broad market space and good development prospects. [0003] Hybrid vehicles have the function of starting and stopping the engine, and the working conditions of starting the engine are very frequent. At the same time, in order to obtain better fuel consumption, clutches and brakes are added to realize the shift function and optimize the working point of the engine. Therefore, the impact of starting the engine and shifting gears on power and economy is very important. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W20/15B60W20/30B60W20/40B60W10/06B60W10/08B60W10/115B60W10/02B60K6/547B60K6/365
CPCB60K6/365B60K6/547B60W10/02B60W10/06B60W10/08B60W10/115B60W20/15B60W20/30B60W20/40B60W2510/244B60W2520/10B60W2540/10B60W2710/02B60W2710/0666B60W2710/081B60W2710/1005Y02T10/62
Inventor 盖福祥钟发平张彤程辉军高骥
Owner 江西鼎盛新材料科技有限公司
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