A hybrid continuously variable transmission device and its control method

Abstract

The invention discloses a hybrid continuously variable speed device, which comprises a transmission input shaft, a driving motor, a continuously variable transmission mechanism, a planetary gear set and a transmission output shaft, the driving motor is connected with the transmission output shaft through the planetary gear set, and the transmission The input shaft is connected with the continuously variable transmission mechanism, and the continuously variable transmission mechanism is connected with the output shaft of the gearbox through the planetary gear set. It also includes multiple clutches, and different working modes are realized through different types of clutch combinations. One end of the gearbox input shaft is connected to the engine through a torsional shock absorber, the other end is connected to the input shaft of the continuously variable transmission mechanism through the C1 clutch, and the output shaft of the continuously variable transmission mechanism is connected to the planetary gear set. The present invention has a compact structure, takes into account multiple working modes, has cost advantages and is easy to control, and can greatly reduce the fuel consumption of the whole vehicle under comprehensive working conditions compared with other hybrid systems due to taking into account multiple working modes. The invention also discloses a control method of the hybrid continuously variable transmission device.

Description

technical field [0001] The invention belongs to the technical field of hybrid power, relates to the field of a hybrid transmission equipped on a vehicle, and in particular relates to a hybrid continuously variable transmission device and a control method thereof. Background technique [0002] With the increasingly stringent national fuel consumption regulations, the proportion of new energy electric vehicles and hybrid system vehicles in the domestic passenger car market has increased year by year. Domestic manufacturers are sparing no effort to develop hybrid systems. In order to achieve better hybrid fuel economy As a result, the structure and performance are constantly being optimized. The single-motor hybrid continuously variable transmission system designed and developed based on the CVT gearbox has more working modes and better performance than other hybrid systems of the same category. Fuel-saving performance, with lower cost advantages, in the current hybrid market, ...

AI Technical Summary

Problems solved by technology

However, due to the current hybrid structure schemes on the market, most of them are P2 structures, and there are fewer work modes that can be realized. Influenced by the transmission efficiency of the gearbox, the power loss of the motor is large, and the power conversion rate is low; the P2 structure has a single working mode, and most P2 structure transmission systems cannot achieve pure engine mode and idle power generation. The demand for high-speed hybrid transmission system is very urgent

[0004] For the selection of single-motor and dual-motor solutions for hybrid systems, based on the analysis of structural layout, cost and cost performance, the dual-motor solution is expensive and difficult to arrange. The combination of factors such as interval restrictions failed to achieve ideal results in terms of fuel-saving effects, and the cost-effectiveness ratio was not good. The ECVT system was subject to the limitations of Toyota's patented technology, and the ECVT hybrid system solution development technology could not be surpassed.

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