Continuously variable transmission (CVT) electronic control system and method

An electronic control system and electronic control technology are applied in the direction of DC motor rotation control, transmission control, and components with teeth, etc., which can solve problems such as low reliability, increased energy loss of hydraulic systems, and energy consumption of oil pumps. To achieve the effect of facilitating maintenance of after-sales personnel, improving safety and preventing misoperation

CN110094500AActive Publication Date: 2019-08-06常州灵塑科技发展有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-08-06

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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.
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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...

Examples

Embodiment

[0038] Such as figure 1 As shown, the present invention utilizes the input throttle switch signal and the analog signal of the gear position signal to carry out digital-to-analog conversion; the brake signal is a switch signal converted by a switch signal circuit; The measurement circuit is converted, and the period method is used at low speed and the frequency method is used at high speed for numerical conversion. After inputting into the microcontroller, the target speed ratio is calculated through an algorithm according to various conversion signals and switch signals. Then output the target speed ratio value to the speed ratio executive motor, so that the actual speed ratio value is constantly approaching the target speed ratio value, and then the actual speed ratio value is continuously fed back to the single chip microcomputer for closed-loop control. Realize the balance between engine output torque and driving resistance, so that the engine can always be maintained in t...