Energy and thermal integration model of hybrid electric vehicle for energy-saving control

Abstract

The invention relates to an energy-saving control-oriented hybrid electric vehicle energy and heat integration model, which belongs to the technical field of hybrid electric vehicle modeling. The purpose of the present invention is an energy-saving control-oriented hybrid electric vehicle energy and heat integration model of each power transmission node module in the power chain from the engine, the motor and other power drive devices to the wheels. The steps of the invention are: determining the power chain input, describing the energy flow state in the power chain, establishing a battery model, establishing an engine energy consumption and temperature model, establishing an air-conditioning heat transfer model, receiving heat chain input instructions, and establishing a cockpit temperature model. The invention establishes the coupling relationship between the heating demand of the cockpit, the power demand of the driver and the energy consumption of the vehicle under the alpine climate condition, realizes the soft measurement of some important thermodynamic variables, and provides support for the evaluation of the driver's comfort.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicle modeling. Background technique [0002] A hybrid electric vehicle is a complex "mechanical-electrical-thermal" integrated system that realizes energy flow and heat transfer. Among them, "energy" refers to the mechanical energy provided by the vehicle power chain (engine, motor, etc.) to drive the vehicle, and "heat" refers to the heat energy transferred in the vehicle thermal chain (engine cooling system, air conditioning system, etc.). In a hybrid vehicle, the power drive device (such as an engine) is not only the source of the power chain that provides mechanical energy for the vehicle to travel, but also the source of the heat chain that transfers heat. The unsteady operation of the vehicle in cold weather is normal, and the energy consumption of the vehicle is not only directly related to the power demand of the driver in the transient driving state, but also seriously coupled...

AI Technical Summary

Problems solved by technology

This invention effectively improves the single-stage accuracy of the lumped parameter dynamic mathematical model, but the complex partial differential equation considering heat transfer is difficult to apply to the design of the control system

Moreover, for hybrid electric vehicles, it is difficult to accurately describe the optimal control indicators that are highly related to temperature, such as the instantaneous fuel consumption of the engine and the thermal demand of the driver.

[0009] To sum up, on the one hand, the published models only focus on the "mechanical-electrical" coupling dynamics involving energy flow in the power chain, and it is difficult to guarantee the consistency of the accuracy of the model with temperature changes; on the other hand, the mathematical model of the vehicle heat transfer process Model calculation is complex, not suitable for the design and development of real-time control algorithms

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