A fuel-saving control method for truck variable speed cruise

Abstract

The invention provides a control method for oil saving of speed change cruise of a truck. The method is characterized by comprising the following steps that 1, a driver operates to make a vehicle enter a speed change cruise function, and after the target cruise vehicle speed is set, operation of the steps 2, 3, 4, 5, 6, 7 and 8 is executed; 2, the posture of the vehicle is judged in real time; 3,the cruise vehicle speed section of the vehicle is set; 4, intervening control over the whole vehicle is carried out; 5, the cruise vehicle speed is regulated and controlled; 6, control over overriding control is carried out; 7, cruise quitting control is carried out; and 8, cruise restoration control is carried out. The method has the following beneficial effects that the real-time posture information of the vehicle can be obtained accurately and reliably; the situation that cruise allowance upper and lower threshold value vehicle speed points are triggered frequently can be avoided, and theprobability of cruise failure is reduced; traffic safety and safety of parts of the whole vehicle can be ensured; fuel oil consumption can be reduced, and meanwhile, work intensity of a braking systemis reduced; and in the cruise process of the vehicle, the situation that torque of an engine changes frequently is avoided, the average combustion efficiency of the engine is improved, the fuel oil consumption is reduced, and the emission is reduced.

Description

technical field [0001] The invention belongs to the field of electronic control of automobiles, and in particular relates to a fuel-saving control method for variable-vehicle-speed cruising applied to trucks. Background technique [0002] The cruise control system (Cruise Control System, abbreviated as CCS), also known as the cruise control device, automatic driving system, etc. After the system is in operation, the driver can set the speed, and the vehicle can maintain the set speed and drive at a constant speed without stepping on the accelerator pedal. Using this system, the driver no longer needs to control the accelerator pedal, which can not only relieve the driver's fatigue caused by long-term driving, but also reduce the speed change caused by bad driving habits, so that the car can drive more economically. In traditional engine cars, after the cruise control system is activated, the fuel supply of the engine is controlled by the computer system, which can continuou...

AI Technical Summary

Problems solved by technology

[0004] The traditional cruise control system of trucks has a high probability of cruising failure in actual use. One reason is that when the vehicle is driving, when the resistance power exceeds the engine power, such as going uphill, the vehicle speed drops, and the cruise control is triggered. When the cruise speed lower limit or the engine speed enters the low-torque area, the cruise system exits; another situation is that when the vehicle is driving, such as when going downhill, the vehicle's controllable auxiliary braking force is not enough to maintain the vehicle speed, which will cause the vehicle speed to increase continuously and trigger Cruise control system exits when the vehicle speed upper limit value or exceeds the safe engine speed value

[0005] The traditional cruise control system of trucks aims to maintain the speed of the vehicle. During the working process of the cruise system, the engine and the braking system are frequently controlled. The engine frequently increases and decreases torque, and the braking system is frequently involved. Taking into account the fuel economy of the whole vehicle

[0006] In view of the low cruise success rate and poor fuel economy of trucks at constant speeds, there is an urgent need for a cruise control method that can not only reduce the driver's labor intensity, but also improve the cruise success rate while taking into account the vehicle's fuel economy.

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