目前在汽车上广泛使用里程表,里程表不但指示汽车的行驶速度,也反映行驶里程,以便确定保养和大修日期,对一些车辆也是确定计费的依据。但是,对于施工机械,里程表就不能全面反映这类机械的特殊情况,因为这些机械大多以低速行驶进行施工作业,如以里程表来计量它们的作业量就不很妥当。但通常情况下,用作业时间以台班来衡量一台机械的作业量。作业时间过去靠作业手估算,误差较大。 At present, odometers are widely used in automobiles. The odometer not only indicates the driving speed of the car, but also reflects the mileage, so as to determine the maintenance and overhaul dates. It is also the basis for determining the charge for some vehicles. However, for construction machinery, odometers cannot fully reflect the special conditions of such machines because they are mostly used for construction work at low speeds, and it is not appropriate to measure their workload with odometers. However, under normal circumstances, working hours are used to measure the workload of a machine. The operating time was estimated by the operator and the error was large.