Gear output strategy for AMT bus

Abstract

The invention discloses a gear output strategy for an AMT bus. The gear output strategy comprises the following steps that the judgment conditions of the climbing condition, the accelerating condition, the braking condition and the sliding condition of the bus and the economic operation condition are prestored, the correspondence relation between a target gear and all the conditions is established, and the correspondence relation of the target gear is determined according to the power performance and the economic performance of the bus under all the conditions; the practical condition of the bus is detected and obtained, and the target gear corresponding to the practical condition is obtained and output. By means of the scheme, the specific requirements under different conditions are combined, and therefore gear replacement is more flexible and can better conform to the driving intention. In addition, reference of multiple parameters is needed in consideration of the economic performance and the power performance under different conditions and is obviously not limited to the vehicle speed compared with the prior art, due to the fact that the power performance and the economic performance are taken into consideration, and a gear changing point changes according to the conditions and is not designed to rotate at a high speed in a unified mode, the common problems that noise is large and machine part abrasion is large in gear shifting in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of buses, in particular to a gear output strategy of a single-axle parallel hybrid electric bus. Background technique [0002] When the vehicle is running, the driver often needs to change gears to change the transmission ratio to speed up or down, or to perform functions such as reversing and neutral idling. [0003] The shift strategy of existing buses mostly adopts the single-parameter method, that is, the gear is replaced only by the speed of the vehicle. The shift operation can only be performed when the vehicle reaches the specified speed. The speed range of each gear is fixed. This single-parameter shift control system has a simple structure. [0004] However, the single-parameter shift strategy has the following technical problems: [0005] 1. The gear shift strategy is only formulated according to the speed of the vehicle, and the driver is not flexible enough to shift gears; [0006] 2. In order...

AI Technical Summary

Problems solved by technology

[0005] 1. The gear shift strategy is only formulated according to the speed of the vehicle, and the driver is not flexible enough to shift gears;

[0006] 2. In order to ensure power performance, the upshift point is generally designed at a higher speed of the engine, which will cause the vehicle to shift gears at a higher speed when driving with a small throttle opening, so that not only noise Larger, the wear of the parts is also greater, it is difficult to balance power and economy

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