不幸的是，气门材料的不同——所谓的特型气门——使得价格不断推高也成为了一辆汽车价格中重要的一部分。
Unfortunately, the valve materials-so called "exotics" -that do make the grade tend to be extremely pricey and can add significantly to the price of a vehicle.
缸盖上装有气门、气门弹簧和摇臂轴上的摇臂，推杆推动这部分气门传动机构工作。
The cylinder head carries the valves, valve springs and the rockers on the rocker shaft, this part of the valve gear being worked by push-rods.
结果显示，大部分工况下进气压力传感器和节气门位置传感器的信号重构误差可控制在10%以内，表明了所提出的调节策略是切实有效的。
The results show that the error of estimated value of both throttle position sensor and manifold pressure sensor are less than 10%, and the strategy put forward in this paper is valid.
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