Ramp based on longitudinal dynamics and vehicle load identification method

Abstract

The invention discloses a ramp based on longitudinal dynamics and a vehicle load identification method. The vehicle load identification method comprises the following steps: 1) getting real-time torque of an engine and real-time vehicle speed information through a gear-shifting control unit; 2) judging the effectiveness of the got real-time torque of the engine and the real-time vehicle speed information through the gear-shifting control unit; 3) updating effective torque and effective vehicle speed at the last time with the effective real-time torque of the engine and effective vehicle speed value through the gear-shifting control unit; 4) performing low-pass filtering treatment on the torque of the engine through the gear-shifting control unit; 5) calculating driving acceleration of a vehicle on a flat road by utilizing the torque of the engine after filtering through the gear-shifting control unit; 6) performing differential calculation on the real-time vehicle speed through the gear-shifting control unit to get the actual driving acceleration of the vehicle; 7) performing the low-pass filtering treatment on the actual driving acceleration of the vehicle through the gear-shifting control unit; 8) figuring out road grade and a vehicle load value through the gear-shifting control unit; and 9) updating corresponding information with the current driving acceleration of the vehicle on the flat road and the current actual driving acceleration of the vehicle through the gear-shifting control unit.

Description

technical field [0001] The present invention relates to a method for identifying slopes and vehicle loads, more specifically, the present invention relates to a method for identifying slopes and vehicle loads based on longitudinal dynamics that can improve the adaptability of automatic transmission systems of vehicles to changes in slopes and vehicle loads method. Background technique [0002] Usually, the shifting strategy of the automatic transmission system of the vehicle is based on the vehicle speed and the throttle opening as the control parameters. It has satisfactory performance on a good level road surface, but in the case of complicated driving conditions, this shifting strategy will produce Shift issues such as shift cycles, unexpected shifts, etc. The reason is that the automatic transmission system does not understand the information of the vehicle itself and its environment. Therefore, the automatic transmission system urgently needs a method for identifying ...

AI Technical Summary

Problems solved by technology

[0003] There are many methods of slope recognition: there is a slope recognition method based on the judgment of the acceleration interval, which is theoretically feasible, but it needs to calibrate a large amount of data in practice; there is also the acceleration signal measured by the acceleration sensor and the actual acceleration of the vehicle. The identification method of the road slope, this method requires an additional acceleration sensor, which undoubtedly increases the cost of the vehicle

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