Continuously variable transmission (CVT) electronic control system and method

Abstract

The invention discloses continuously variable transmission (CVT) electronic control system and method. The CVT electronic control system comprises a motor control circuit, a motor locking device, a power module, a speed ratio execution motor and a controller area network (CAN) communication network, wherein the motor control circuit inputs signals of a throttle opening sensor and gears into a single chip microcomputer through AD conversion; an engine brake signal is input into the single chip microcomputer through a switch quantity input signal, namely, a switching signal; an engine rotate speed pulse signal is numerically converted through a pulse measurement circuit to obtain the rotate speed so as to be input into the single chip microcomputer, and a motor locking circuit outputs a pulse-width modulation (PWM) signal for the single chip microcomputer to the speed ratio execution motor; the single chip microcomputer outputs the switch quantity signal to the speed ratio execution motor so as to lock a relay; and the single chip microcomputer calculates the rotate speed for MC9S12G48 according to a periodic method and a frequency method. According to the CVT electronic control system and the method provided by the invention, the actual transmission speed ratio continuously approaches to the target speed ratio, the balance of the output torque and the driving resistance of an engine is realized, and the optimum performance of a vehicle is exerted.

Description

technical field [0001] The invention relates to a CVT gearbox in an automobile, in particular to an electronic control in the CVT gearbox. Background technique [0002] The automobile industry originated in Europe, from the steam engine to the internal combustion engine. After more than 100 years of development, the development of modern automobiles has entered a mature stage. With the rapid development of automobiles, people have higher and higher requirements for automobiles, not only for the comfort, safety and economy of automobiles, but also for the driving performance and emission of automobiles. standard. Therefore, many innovative technologies have been brought, and automatic transmission technology is one of the important technologies. [0003] A continuously variable transmission is a transmission that can continuously change the speed ratio. The current belt-driven continuously variable transmission mainly adopts the metal belt type and the metal chain type. Co...

AI Technical Summary

Problems solved by technology

[0004] In modern metal belt CVT, mechanical hydraulic control system and electronic hydraulic control system are generally used, but the mechanical hydraulic control system cannot realize the precise control of the speed ratio, and the working pressure of this hydraulic control system is high, resulting in the energy of the hydraulic system. The loss increases, and the hydraulic control system requires the oil pump to provide continuous and stable pressure, and the oil pump continues to consume energy

Therefore, this hydraulic control system has the disadvantages of low reliability, high energy consumption and high cost.

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