CvtGearbox

CvtGearbox

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The CVT gear box (device name "cvtGearbox") is a model of a continuously variable transmission including a one way hill holding viscous clutch, and a parking lock. Unlike an automatic gearbox, the CVT changes effective gear ratio continuously to maintain a target engine speed. In a Powertrain, it can be placed behind a torqueConverter, and should have a shaft, differential, rangeBox, or splitShaft connected to it.

Jbeam Properties

Name Type Optional Default Value Description
minGearRatio number true 0.5 This is the tallest gear ratio available to the gearbox.
maxGearRatio number true 2.5 This is the shortest gear ratio available to the gearbox.
oneWayViscousCoef number true 5 This value controls how stiff the hill holding viscous clutch is. A higher value will make the vehicle less likely to creep backwards on a hill.
oneWayViscousTorque number true =onewayViscousCoef*20 The upper limit for hill holding torque, used for stability reasons.
parkLockTorque number true 1000 The upper limit for the parking lock torque. If exceeded, the parking lock will slip.
parkLockSpring number true =parkLockTorque The stiffness of the parking lock spring. Too high may cause instability.
friction number true 0 The friction torque applied to the input side of the gearbox.

Examples

Here is an example of the required powertrain section, along with the additional section for the properties.

    "powertrain": [
        ["type", "name", "inputName", "inputIndex"],
        ["cvtGearbox", "gearbox", "torqueConverter", 1],
    ],
    "gearbox": {
        "minGearRatio":0.8,
        "maxGearRatio":2.7,
        "parkLockTorque":2000,
        "oneWayViscousCoef":8,
        "friction": 1,
    },