在过去，机器内部的一整套控制系统是由硬件组成的：传动装置，杠杆和凸轮。

The control systems inside machines used to be physical: gears and levers and cams.

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4缸机为16气门DOHC（双凸轮抽）设计，配备丰田VVT-i（智能正时可变气门控制系统），最大功率179hp/6000rpm(131kw/6000rpm),最大扭矩172lb-ft/4000rpm(233Nm/4000rpm).

The 4-cylinder is a 16-valve DOHC design with Toyota’s VVT-i variable cam timing system, and is rated at 179 horsepower at 6000 rpm and 172 lb-ft of torque at 4000 rpm.

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系统计算法常常用于设计凸轮和从动件机构以及分析其特性。

System calculations is often used in designing CAM and follower mechanisms and in analyzing their performance.

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