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Vehicle energy conservation acceleration way optimization method based on pseudo-spectral method

An optimization method and a pseudo-spectral technique, which are applied in the field of optimization calculation of energy-saving acceleration modes of vehicles with discrete gears, and can solve problems such as discrete transmission speed ratios and difficulties in theoretical numerical solutions.

Active Publication Date: 2015-05-13
TSINGHUA UNIV +1
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Problems solved by technology

[0007] At present, the theoretical research on energy-saving acceleration methods in the acceleration process of vehicles equipped with traditional mechanical transmissions is basically blank. One important reason is that due to the discrete speed ratio of the transmission, it is difficult to solve them theoretically or numerically.

Method used

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  • Vehicle energy conservation acceleration way optimization method based on pseudo-spectral method
  • Vehicle energy conservation acceleration way optimization method based on pseudo-spectral method
  • Vehicle energy conservation acceleration way optimization method based on pseudo-spectral method

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Embodiment Construction

[0087] The optimization method of the vehicle energy-saving acceleration method based on the pseudo-spectral method proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0088] The method of the present invention is aimed at the optimization of the acceleration process of the MT type vehicle, and the overall process of the specific implementation of the method is as follows figure 1 shown, including the following steps:

[0089] 1) The objective function of constructing the integer optimal control model is shown in formula (1):

[0090]

[0091] In the formula: J is the equivalent fuel consumption, k s is the distance correction coefficient, s f is the acceleration distance, t f is the acceleration termination time, T e is the engine torque, w e is the engine speed, is the instantaneous fuel injection rate of the engine;

[0092] 2) Construct multiple constraints of the optimal control mo...

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Abstract

The invention provides a vehicle energy conservation acceleration way optimization method based on a pseudo-spectral method, and belongs to the technical field of automobile driving assistance systems. The method comprises the steps that an integral optimal control model formed by an objective function and a plurality of constraint conditions are established, the integral optimal control model is transformed into multisection smooth model: a Legendre pseudo-spectral method is adopted to solve the multisection smooth model to obtain an optimized acceleration way. The method can be served as a driving assistance algorithm for providing an elevated energy conservation acceleration way for a gears discrete distribution automobile. By the adoption of a simulating calculation, under a certain conditions, compared with an adoption of a way of a constant accelerated speed, the optimized acceleration way of the vehicle energy conservation acceleration way optimization method based on the pseudo-spectral method can save 24.76% of oil, and has very strong oil-saving ability.

Description

technical field [0001] The invention belongs to the technical field of automobile driving assistance systems, and in particular relates to an optimization calculation method for an energy-saving acceleration mode of a gear-discrete vehicle. Background technique [0002] As a large energy consumer, automobiles are facing enormous pressure to save fuel under the current situation of shortage of oil resources. The "Energy Conservation and New Energy Automobile Industry Development Plan" promulgated by the State Council pointed out that the average fuel consumption per 100 kilometers of passenger cars must be reduced from 7.71L in 2010 to 5L by 2020. Strict regulations will greatly promote the development of various energy-saving technologies for vehicles. At present, there are four main technical fields to improve the fuel-saving ability of automobiles: more efficient automobiles, intelligent transportation, new energy utilization and economical driving. Among them, economica...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W40/10B60W40/105
CPCB60W40/10B60W40/105B60W2520/10B60W2720/106
Inventor 李升波成波徐少兵郭强强王文军李国法李仁杰忻隆
Owner TSINGHUA UNIV
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