公开(公告)号：US3864731A

公开(公告)日：1975-02-04

申请号：US37937173

申请日：1973-07-16

Applicant: VAPOR CORP

Inventor： CALLAHAN BERNARD E

IPC: B60L3/12 ,  G07C5/08 ,  G11B5/00

CPC classification number: B60L3/12 ,  B60L2200/26 ,  G07C5/0875 ,  Y02T90/16

Abstract: An axle pickup generates signals each time a vehicle travels a predetermined distance. Means are provided for measuring distance travelled as well as measuring changes in vehicle speed. If the speed has varied between sequential signals, or if particular events are detected during sequential signals, a tape recorder is actuated to record these occurrences. If there is no speed change and no events occur, the recorder is not actuated thus effecting data compression.

Abstract translation: 每当车辆行驶预定距离时，轴拾取器产生信号。 提供用于测量行驶距离以及测量车辆速度变化的装置。 如果速度在顺序信号之间变化，或者如果在顺序信号期间检测到特定事件，则启动磁带录音机记录这些事件。 如果没有速度变化并且没有发生事件，则记录器不被致动，从而进行数据压缩。

公开(公告)号：US3867647A

公开(公告)日：1975-02-18

申请号：US36429873

申请日：1973-05-29

Applicant: VAPOR CORP

Inventor： CALLAHAN BERNARD E ,  HIGGINS PHILIP M

IPC: B60L3/10 ,  B60T8/171 ,  G01P3/48 ,  G01P3/54 ,  H03K5/18

CPC classification number: B60L3/10 ,  B60L2200/26 ,  B60T8/171 ,  G01P3/4805

Abstract: A speed detector for producing from the output of an axlemounted transducer an analog output signal indicative of the speed of a moving vehicle. A signal processing circuit responsive to the output of the transducer generates a square-wave control signal which is utilized to control the recurrent charging and discharging of an error integrating capacitor. The rate of discharge of the capacitor is such that an error voltage is developed across the capacitor indicative of the vehicle speed error, and an FET switch controlled by the square-wave periodically applies this error as a pulse to a storage integrator. By varying the discharge rate of the capacitor in accordance with the voltage developed in the storage integrator, an analog output signal indicative of vehicle speed is developed. By controlling the conduction time of the FET switch, the effectiveness of the error on the analog output signal is proportioned to the absolute speed error of the vehicle.

Abstract translation: 一种速度检测器，用于从轴安装的换能器的输出产生指示移动车辆的速度的模拟输出信号。 响应于换能器的输出的信号处理电路产生一个方波控制信号，用于控制误差积分电容器的反复充电和放电。 电容器的放电速率使得在电容器上产生指示车速误差的误差电压，并且由方波控制的FET开关周期性地将该误差作为脉冲施加到存储积分器。 通过根据存储积分器中产生的电压来改变电容器的放电率，开发出表示车速的模拟输出信号。 通过控制FET开关的导通时间，误差对模拟输出信号的有效性与车辆的绝对速度误差成正比。