Hybrid power system, method and automobile based on dual-mode homogenizing compression ignition internal combustion engine

Abstract

The invention relates to a hybrid power system based on a dual-mode homogenizing compression ignition internal combustion engine. The hybrid power system comprises a power device, a transmission device, a clutch device, an inverting control device, a power battery unit and a hybrid power control unit. The invention further relates to a hybrid power control method and automobile achieved on the basis of the hybrid power system. The hybrid power system has the advantages of being good in technical expansibility and high in following performance, benefit-cost ratio and practical value and having flexibility in hybrid power flow direction control and can be applied to almost all vehicle models.

Description

technical field [0001] The present invention relates to a hybrid power system, in particular to a dual-mode homogeneous charge compression ignition (HCCI, Homogenous Charge Compression Ignition) internal combustion engine as the main power source and mechanical connection, power circuit as the energy transmission medium and integrated motor / A hybrid power drive system of a generator, a power battery unit and its control technology, a hybrid power control method and an automobile. Background technique [0002] Because the traditional internal combustion engine can only obtain better fuel economy at a few high-load operating points, and in daily life, motor vehicles with internal combustion engines as the main power source most often run at low load or idling conditions and frequently start , so the overall fuel consumption is high. The homogeneous compression ignition internal combustion engine has higher fuel economy and lower emissions than the traditional internal combus...

AI Technical Summary

Problems solved by technology

Although the upper limit of power output can be expanded by switching between dual-combustion modes, problems such as poor instantaneous response and insufficient ability to change working conditions restrict it from replacing existing traditional vehicle internal combustion engines for large-scale promotion and use.

[0003] Existing hybrid power systems generally use traditional ignition-type Otto cycle or Atkinson cycle internal combustion engines. These internal combustion engines have poor working efficiency in low-speed and low-load conditions. In order to ensure higher efficiency of hybrid power systems, internal combustion engines are often used In the high-efficiency area of ​​medium-to-high load conditions, there is often a surplus of internal combustion engine output power in urban conditions with low power output requirements. It is necessary to equip large-capacity batteries for energy storage, and the high-power and high-current charging form is easy to damage the power battery. Damage to performance and service life increases the manufacturing cost and maintenance cost of hybrid vehicles, which becomes an important factor affecting the sales and application of hybrid vehicles

[0004] In the patent applications with application numbers 200820165300.5 and 200810121177.1, proposals for hybrid vehicles using HCCI internal combustion engines were proposed. These proposals use HCCI internal combustion engines as the main power output source, and the mechanical connection between the internal combustion engine and the wheels. The change of driving road conditions is directly reflected by the internal combustion engine. The change of speed / load has quite high requirements on the response of the internal combustion engine to variable working conditions. However, the HCCI internal combustion engine is not capable in this regard. Even if the internal combustion engine is used for load regulation, frequent and rapid changes in working conditions are likely to cause HCCI internal combustion engines. Unstable operation such as misfire and knocking caused by the difficulty in controlling the start of combustion, greatly reduced work efficiency and worsened emissions

In addition, compared with the traditional ignition internal combustion engine of the same displacement, the maximum output torque / power of the HCCI internal combustion engine at the same speed is much smaller. Therefore, in order to meet the continuous high power output requirements of the vehicle, such as long-term high-speed working conditions, continuous climbing In other road conditions, it is necessary to equip an HCCI internal combustion engine with a larger displacement. When the battery power is insufficient and the motor cannot assist, it can achieve a separate high-power output. An increase in displacement means an increase in friction loss and a decrease in the efficiency of the internal combustion engine; at the same time, This also poses a problem for the layout of the original compact hybrid vehicle parts

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