阅读说明：本技术 一种车辆自动变速器控制单元的档位控制方法 (Gear control method of vehicle automatic transmission control unit ) 是由 贾安通 狄小祥 李勤 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种车辆自动变速器控制单元的档位控制方法,包括：在自动变速器控制单元中预先设置两个或两个以上用于档位切换控制的换挡线；每个所述的换挡线对应一个车辆运行工况；车辆在行驶过程中根据车辆运行的工况选择工况对应的换挡线来控制车辆的换挡。本发明的优点在于：基于工况的不同设置不同的换挡线,从而实现换挡的可靠,避免档位不匹配的情况造成的驾驶风险,提高了驾驶体验。(The invention discloses a gear control method of a vehicle automatic transmission control unit, which comprises the following steps: two or more shift lines for shift change control are preset in an automatic transmission control unit; each gear shifting line corresponds to one vehicle running condition; and selecting a gear shifting line corresponding to the working condition according to the working condition of the running vehicle to control the gear shifting of the vehicle in the running process of the vehicle. The invention has the advantages that: different gear shifting lines are arranged based on different working conditions, so that gear shifting is reliable, driving risks caused by the fact that gears are not matched are avoided, and driving experience is improved.)

1. A gear control method of a control unit of a vehicle automatic transmission, characterized in that:

two or more shift lines for shift change control are preset in an automatic transmission control unit; each gear shifting line corresponds to one vehicle running condition;

and selecting a gear shifting line corresponding to the working condition according to the working condition of the running vehicle to control the gear shifting of the vehicle in the running process of the vehicle.

2. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 1, characterized in that:

the working conditions comprise straight-running working conditions and turning working conditions, and the straight-running working conditions and the turning working conditions respectively correspond to a straight-running working condition gear change line and a turning working condition gear change line; after the engine transmission control unit detects that the vehicle is in a straight-going working condition or a turning working condition, the engine transmission control unit correspondingly adopts a straight-going working condition gear shifting line and a turning working condition gear shifting line to carry out gear shifting control.

3. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 1, characterized in that:

when the vehicle runs, the vehicle automatic transmission control unit judges the working condition of the vehicle according to the collected data, determines a gear shifting line used for controlling gear shifting according to the disclosure of the vehicle, and then controls gear shifting to be carried out based on the gear shifting line according to the vehicle running data at the moment.

4. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 2, characterized in that: the relationship curves among the vehicle speed, the engine speed, the accelerator pedal angle and the gearbox gear are calibrated in advance by a straight-going working condition shift line; when the vehicle runs under the straight-running working condition, reading real-time vehicle speed, engine rotating speed and accelerator pedal angle signals of the vehicle, obtaining corresponding gearbox gears based on straight-running conditions, and then controlling the gear state of the automatic transmission by the obtained gearbox gears.

5. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 2, characterized in that: the relationship curve among the steering wheel corner, the vehicle speed, the engine rotating speed, the accelerator pedal angle and the gearbox gear is calibrated in advance by a turning working condition shift line; when the vehicle runs under the turning working condition, real-time signals of the steering wheel angle, the vehicle speed, the engine rotating speed and the accelerator pedal angle of the vehicle are read, corresponding gear positions of the gearbox are obtained based on a turning working condition gear shifting line, and then the gear state of the automatic gearbox is controlled according to the obtained gear positions of the gearbox.

6. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 2, characterized in that: when the gear shifting line of the turning condition is calibrated by the automatic transmission control unit, the calibration of the turning condition is increased; and when the calibration is carried out, the gear shifting line under the turning working condition is obtained by correcting the gear shifting position according to the angle of the turning angle based on the gear shifting line under the straight-going working condition.

7. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 1 or 2, characterized in that: the working conditions further comprise climbing working conditions and downhill working conditions, and the corresponding gear shifting lines comprise climbing condition gear shifting lines and downhill working condition gear shifting lines.

8. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 2, 5 or 6, characterized in that: the vehicle automatic transmission control unit reads vehicle operation data in a CAN communication mode to judge vehicle working conditions and determines gears for controlling the automatic transmission according to the data.

9. A shift position control method of a control unit of an automatic transmission for a vehicle according to claim 1 or 2, characterized in that: under the condition that the vehicle speed, the accelerator pedal and the engine rotating speed are the same, the gear determined by the turning working condition gear changing line is smaller than the gear determined by the straight working condition gear changing line.

Technical Field

The invention relates to the field of automobile electronic control, in particular to a gear control method of a control unit of an automatic transmission of a vehicle.

Background

The automatic transmission is used as a gear shifting control component in vehicle control, gear shifting lines can be calibrated in experiments according to vehicle speed, an accelerator pedal angle and the like, and reasonable gear shifting logic is controlled according to data of the gear shifting lines to realize gear lifting. The gear shifting control method of the automatic gearbox in the prior art only has one control logic, the logic is generally based on a gear shifting line calibrated by straight line driving, the form requirements of the vehicle under different environments cannot be well met, if the gear identification control of the existing automatic gearbox is the same as that of a straight road when the vehicle passes a bend, the gear when the vehicle passes the bend cannot be independently controlled, and compared with a manual transmission, the gear shifting control method cannot bring more excellent driving feeling to a driver. This kind of no matter what kind of operating mode all adopts a gear shift control logic, line of shifting gears, has caused the vehicle to shift and the operating mode is unmatched, causes the unmatched gear control of going of vehicle to cause and drives experience and vehicle form all have the problem.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a gear control method and a gear control system of a control unit of an automatic transmission of a vehicle, which are used for realizing different gear shifting strategies based on different working conditions, ensuring the matching of gear shifting and the working conditions and improving the user experience.

In order to achieve the purpose, the invention adopts the technical scheme that: a gear position control method of a vehicle automatic transmission control unit, comprising:

two or more shift lines for shift change control are preset in an automatic transmission control unit; each gear shifting line corresponds to one vehicle running condition;

and selecting a gear shifting line corresponding to the working condition according to the working condition of the running vehicle to control the gear shifting of the vehicle in the running process of the vehicle.

The working conditions comprise straight-running working conditions and turning working conditions, and the straight-running working conditions and the turning working conditions respectively correspond to a straight-running working condition gear change line and a turning working condition gear change line; after the engine transmission control unit detects that the vehicle is in a straight-going working condition or a turning working condition, the engine transmission control unit correspondingly adopts a straight-going working condition gear shifting line and a turning working condition gear shifting line to carry out gear shifting control.

When the vehicle runs, the vehicle automatic transmission control unit judges the working condition of the vehicle according to the collected data, determines a gear shifting line used for controlling gear shifting according to the disclosure of the vehicle, and then controls gear shifting to be carried out based on the gear shifting line according to the vehicle running data at the moment.

The relationship curves among the vehicle speed, the engine speed, the accelerator pedal angle and the gearbox gear are calibrated in advance by a straight-going working condition shift line; when the vehicle runs under the straight-running working condition, reading real-time vehicle speed, engine rotating speed and accelerator pedal angle signals of the vehicle, obtaining corresponding gearbox gears based on straight-running conditions, and then controlling the gear state of the automatic transmission by the obtained gearbox gears.

The relationship curve among the steering wheel corner, the vehicle speed, the engine rotating speed, the accelerator pedal angle and the gearbox gear is calibrated in advance by a turning working condition shift line; when the vehicle runs under the turning working condition, real-time signals of the steering wheel angle, the vehicle speed, the engine rotating speed and the accelerator pedal angle of the vehicle are read, corresponding gear positions of the gearbox are obtained based on a turning working condition gear shifting line, and then the gear state of the automatic gearbox is controlled according to the obtained gear positions of the gearbox.

When the gear shifting line of the turning condition is calibrated by the automatic transmission control unit, the calibration of the turning condition is increased; and when the calibration is carried out, the gear shifting line under the turning working condition is obtained by correcting the gear shifting position according to the angle of the turning angle based on the gear shifting line under the straight-going working condition.

The working conditions further comprise climbing working conditions and downhill working conditions, and the corresponding gear shifting lines comprise climbing condition gear shifting lines and downhill working condition gear shifting lines.

The vehicle automatic transmission control unit reads vehicle operation data in a CAN communication mode to judge vehicle working conditions and determines gears for controlling the automatic transmission according to the data.

Under the condition that the vehicle speed, the accelerator pedal and the engine rotating speed are the same, the gear determined by the turning working condition gear changing line is smaller than the gear determined by the straight working condition gear changing line.

The invention has the advantages that: different gear shifting lines are set based on different working conditions, so that the gear shifting is reliable, the driving risk caused by the condition that gears are not matched is avoided, and the driving experience is improved; the differentiation that shifts is carried out to direct operating mode and turn operating mode, and the gear that the line of shifting corresponds under the turn operating mode is in low gear, avoids high gear and rotational speed etc. to cause and mismatch, and the driving that causes experiences the problem for the vehicle moves safelyr under the turn operating mode.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

FIG. 1 is a schematic diagram of the control method of the present invention.

Detailed Description

The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.

The line of shifting among the prior art generally is that to mark under the straight line operating mode, and it is applicable to most straight line environment, but when turning, needs low-gear operation, can not shift according to the logic of shifting when going straight otherwise cause gear mismatch and driving risk, consequently this application improves prior art.

The gear shifting line is a data table or curve corresponding to the vehicle running state data and the gear position built in the automatic transmission control unit, the TCU can read the gear position of the automatic engine transmission through the gear shifting line according to the real-time running data of the vehicle, such as the vehicle speed, the opening degree of an accelerator pedal, the rotating speed of an engine and the like, and then the TCU controls the current gear position to be switched to the gear position. The automatic transmission control unit is hereinafter referred to as TCU.

The gear shifting line that current vehicle adopted the same strategy of shifting to different operating modes, this kind can cause not have the problem when going straight, but under the state such as turn, go up the downhill path, the gear mismatch can cause certain driving to experience poor and certain risk, sets up different gear shifting lines based on different operating modes based on this application, specifically includes:

a gear position control method of a vehicle automatic transmission control unit, comprising: two or more shift lines for shift change control are preset in an automatic transmission control unit;

each gear shifting line corresponds to one vehicle running condition;

the method comprises the steps that a gear shifting line corresponding to a working condition is selected according to the real-time running working condition of a vehicle in the running process of the vehicle, corresponding gearbox gear information is obtained from the gear shifting line based on the gear shifting line and the real-time running data, and gear shifting of the vehicle is controlled by the gear information. Therefore, different gear shifting lines are adopted to match the working conditions under different working conditions, and the gear information for control is acquired based on the gear shifting lines according to the real-time vehicle data, so that the gear control of the automatic transmission is realized.

The TCU needs to determine a working condition according to the read vehicle data to select a corresponding shift line, then reads a corresponding shift gear in combination with the shift line based on the vehicle operation data, and then controls the gear of the transmission with the shift gear. The TCU reads vehicle operation data in a CAN communication mode to judge the working condition of the vehicle and determines a gear for controlling the automatic transmission according to the data. The TCU is connected with a whole vehicle CAN bus network through a CAN network and reads the running data of the vehicle according to a vehicle-mounted sensor and the like of the vehicle.

Because the required logic of shifting should be different under the operating mode of difference, consequently can mark the logic of shifting under the operating mode according to the demand of reality to satisfy the demand of shifting under the different situation, the disclosure of general vehicle is including straight line operating mode and turn operating mode, still including uphill operating mode, downhill path operating mode etc. under some circumstances, this application carries out the principle description based on straight line operating mode and turn operating mode, specifically as follows:

the straight-driving working condition and the turning working condition respectively correspond to a straight-driving working condition gear shifting line and a turning working condition gear shifting line;

the relationship curves among the vehicle speed, the engine speed, the accelerator pedal angle and the gearbox gear are calibrated in advance by a straight-going working condition shift line; when the vehicle runs under the straight-running working condition, reading real-time vehicle speed, engine rotating speed and accelerator pedal angle signals of the vehicle, obtaining corresponding gearbox gears based on straight-running conditions, and then controlling the gear state of the automatic transmission by the obtained gearbox gears.

The relationship curve among the steering wheel corner, the vehicle speed, the engine rotating speed, the accelerator pedal angle and the gearbox gear is calibrated in advance by a turning working condition shift line; when the vehicle runs under the turning working condition, real-time signals of the steering wheel angle, the vehicle speed, the engine rotating speed and the accelerator pedal angle of the vehicle are read, corresponding gear positions of the gearbox are obtained based on a turning working condition gear shifting line, and then the gear state of the automatic gearbox is controlled according to the obtained gear positions of the gearbox. Certainly, under the turning condition, compared with the straight-driving condition, only the gear is lower than that under the straight-driving condition when the vehicle turns, the turning speed is required to be slower, and the safety is ensured, so that relatively speaking, under the condition of the same vehicle data, the gear is lower, namely under the condition that the vehicle speed, the accelerator pedal and the engine rotating speed are the same, the gear determined by the turning condition gear shifting line is smaller than the gear determined by the straight-driving condition gear shifting line. Therefore, the gear requirement under turning is met, the turning safety is guaranteed, and the user experience during turning is improved. Based on the principle, the shifting line in the straight running process can be directly adopted during calibration, and the gears corresponding to the same speed, the same engine speed and the same accelerator pedal opening degree in the shifting line in the straight running process are reduced to be used as the shifting line for turning. When the gear shifting line is calibrated by the automatic transmission control unit in the turning condition, the calibration of the turning condition is increased; and when the calibration is carried out, the gear shifting line under the turning working condition is obtained by correcting the gear shifting position according to the angle of the turning angle based on the gear shifting line under the straight-going working condition.

After the engine transmission control unit detects that the vehicle is in a straight-going working condition or a turning working condition, the engine transmission control unit correspondingly adopts a straight-going working condition gear shifting line and a turning working condition gear shifting line to carry out gear shifting control.

When the vehicle runs, the vehicle automatic transmission control unit judges the working condition of the vehicle according to the collected data, determines a gear shifting line used for controlling gear shifting according to the disclosure of the vehicle, and then controls gear shifting to be carried out based on the gear shifting line according to the vehicle running data at the moment.

The system mainly utilizes a steering wheel angle sensor to identify the expected turning of a driver, and actively corrects the gear-up threshold, so that the vehicle runs at a gear lower than a straight road when passing a curve, and the control performance of the vehicle is improved.

The main body includes but is not limited to two parts:

firstly, a steering wheel angle sensor inputs a vehicle turning angle signal to a TCU through a CAN (not limited to other modes of the CAN), the input mode and method are not specified uniformly, and the TCU only needs to receive the turning angle signal;

and secondly, the TCU corrects the TCU gear shifting line according to the vehicle turning angle, so that a gear shifting line based on an accelerator pedal, the vehicle speed, the engine rotating speed and the turning angle is built, and the gear of the transmission during the over-bending is controlled. (the dimension of the angle of rotation is added to the dimension of the existing gear shifting line control, the specific operation method can be that the calibration of curve running is added when the TCU is calibrated, tables of the angle of rotation such as 0 degree, 15 degree, 30 degree … and the like can be independently arranged, and the gear shifting line can be simply corrected).

The method mainly utilizes a steering wheel angle sensor to identify the expected turning of a driver, and actively corrects the gear-up threshold, so that the vehicle runs at a gear lower than a straight road when passing a curve, and the control performance of the vehicle is improved. The TCU receives and processes the vehicle turning signal and controls the transmission to operate at a proper gear, so that driving experience and safety are guaranteed.

It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.