位置正时是指ecu通过对转速信号的处理，判定当前工作缸号及计算曲轴当前位置的过程。
Location synchronization is the process that the ECU processes speed signal, and determines the current working the number of cylinder and the current location of crankshaft.
结果表明，减小同步带跨度既可以有效减小同步带运动过程中横向振动幅度，又可以使同步带运动有效避开正时传动机构可能的共振区。
The study shows that shortening the span length can effectively reduce the transverse vibration amplitude of synchronous belt and can avoid possible resonance region of synchronous belt.
结果表明，通过调节排气门关闭正时，适当增大缸内残余废气量，可显著改善起动过程初始着火循环的着火燃烧性能和提高起动过程缸内燃烧的稳定性。
The results show that a proper increase of residual gas fraction could promote ignition and combustion stability of first firing cycle significantly during cold start.
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