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Constant speed cruise control method and system

A constant speed cruise and control method technology, applied in the direction of control devices, external condition input parameters, transportation and packaging, etc., can solve the problems of poor vehicle comfort, achieve the effect of reducing the number of shifts and improving comfort

Active Publication Date: 2016-11-23
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention aims to propose a constant speed cruise control method and system to solve the problem of poor comfort of the vehicle due to frequent gear changes when the vehicle in the constant speed cruise state is driving on a slope.

Method used

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  • Constant speed cruise control method and system
  • Constant speed cruise control method and system
  • Constant speed cruise control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides a constant speed cruise control method, see figure 1 shown, including:

[0049] 101. Determine the corrected output shaft speed according to the gradient value of the vehicle.

[0050] Specifically, determining the corrected output shaft speed according to the slope value of the vehicle includes: setting a plurality of shift points, each of the shift points, the throttle opening and the slope value are in one-to-one correspondence;

[0051] Select the corresponding shift point according to the slope value of the vehicle, and calculate and correct the rotational speed of the output shaft according to the selected shift point.

[0052] 102. If the current output shaft speed is greater than or equal to the corrected output shaft speed, enter the pre-shift state.

[0053] 103. In the pre-shift state, if the target cruising speed, the current cruising speed, the vehicle speed state and the vehicle state meet the preset conditions, perform the shift...

Embodiment 2

[0065] This embodiment provides a constant speed cruise control method, which is applied to the gear shift control of the automobile in the constant speed cruise state, see figure 2 shown, including:

[0066] 201. Obtain the current slope value.

[0067] For example, the TCU receives the slope signal detected by the sensor from the CAN network, and determines the slope value of the road on which the car is currently driving according to the slope signal. Specifically, the slope value can range from 0 to 180 degrees, and 0 to 90 degrees is defined as an uphill slope, and 90 to 180 degrees is defined as a downhill slope. The above definition is only a possible implementation mode, which can be defined according to the actual situation. There is no limit here.

[0068] 202. Select a shift point according to the gradient value, and determine the corrected output shaft rotational speed corresponding to the shift point.

[0069] For example, it is necessary to set the correspond...

Embodiment 3

[0084] This embodiment provides a cruise control system 30, see image 3 shown, including:

[0085] The slope vehicle speed correction unit 31 is used to determine and correct the output shaft speed according to the slope value of the vehicle;

[0086] The pre-shift unit 32 is used to enter the pre-shift state when the current output shaft speed is greater than or equal to the corrected output shaft speed;

[0087] The shifting unit 33 is used to execute the shifting operation according to the corrected output shaft speed if the target cruising speed, the current cruising speed, the vehicle speed state and the vehicle state meet the preset conditions in the pre-shifting state;

[0088] The shifting unit 33 is also used to cancel the shifting operation if the target cruising speed, the current cruising speed, the vehicle speed state and the vehicle state do not meet the preset conditions in the pre-shifting state.

[0089] Wherein, the slope vehicle speed correction unit 31 i...

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Abstract

The invention provides a constant speed cruise control method and system. The constant speed cruise control method includes the steps that corrected output shaft rotating speed is determined according to the value of slope where a vehicle is located; if the current output shaft rotating speed is higher than or equal to the corrected output shaft rotating speed, the vehicle is in a pre-gear-shifting state; in the pre-gear-shifting state, if the target cruise speed, the current cruise speed, the speed state and the vehicle state meet preset conditions, the gear shifting operation is carried out according to the corrected output shaft rotating speed; in the pre-gear-shifting state, if the target cruise speed, the current cruise speed, the speed state and the vehicle state do not meet preset conditions, the gear shifting operation is canceled. The constant speed cruise control method and system can improve comfort of the vehicle during driving on a ramp in a constant speed cruise state.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a constant speed cruise control method and system. Background technique [0002] Cruise control technology is a widely used car driving control technology at present. After setting the driving speed and closing the control switch, the driver can automatically maintain the speed of the car without stepping on the accelerator pedal, so that the vehicle can run at a fixed speed. . After adopting this control method, when driving on the highway for a long time, the driver no longer needs to pay attention to controlling the accelerator pedal, which reduces fatigue, reduces unnecessary speed changes, and improves fuel economy. [0003] The above constant speed cruise control technology is realized through the mutual cooperation of the engine and the automatic transmission. The principle is: when the vehicle is in the constant speed cruise state, the ECU (Electronic Control Unit, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/14
CPCB60W30/143B60W2520/10B60W2552/15
Inventor 郑刘正何长胜李孝军郭小雷李乾坤张占春宣化康树利陶隆棋刘晓龙
Owner GREAT WALL MOTOR CO LTD
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