The portable locomotive speed signal generator can simulate the running parameters of the locomotive and accurately output the speed change signal, which is convenient for the maintenance personnel to check the fault point in time and improve the maintenance efficiency. The device adopts a hand-held structure, and integrates a pulse forming module, a power amplifying module, fault diagnosis, information display, input and output and other functional modules to form a complete system capable of independently and accurately simulating the locomotive speed signal, and is convenient. Effectively and reliably detect the line condition related to the speed signal of the locomotive. This paper describes in detail the development plan, system structure and main functional characteristics of the signal generator, and introduces its field use.
The locomotive speed detection system is an important link between the reliable control of the locomotive and the safe operation of the locomotive, which directly affects the safety punctuality of the locomotive operation. At present, the locomotive speed signals required for the transition device, monitoring device, anti-aircraft system and vehicle bearing detection device of the main trunk locomotives in the railway are provided by the speed sensors mounted on the axles of the wheels. The photoelectric speed sensor is generally used, and the speed signal is provided to the speedometer, the train operation monitoring and recording device system, the locomotive control electronic cabinet, and the diesel engine excitation system. When the locomotive is returned to the section for repair, because the speed of the motor train or the speed of the train is not high, there is no speed signal output or the signal strength of the output speed is not enough. Therefore, the system detection that requires the speed signal becomes a difficult task in the test and maintenance of the locomotive. To this end, the design and development of the locomotive photoelectric speed sensor analog signal generator, so that the locomotive simulates the speed signal in the static non-moving situation, is of great significance to meet the needs of locomotive maintenance work.
1 overall plan1.1 System Design Principle
The analog signal sent by the equipment is compatible with the speed sensor output signals installed on the DF4D, DF8, DF11, SS7, SS8 and SS9 locomotives currently used on domestic railways. At the same time, due to the different wheel diameters of various machines, The equipment should be able to adjust the wheel diameter and output the corresponding frequency pulse. The locomotive speed signal generator should meet the following requirements: 1) The signal output is a square wave signal with a duty ratio of 50%, and the high level is 12V; 2) The output bandwidth is 2 to 9 999 Hz; 3) the maximum DC current is 10 mA; 4) the output accuracy is 1%; 5) the number is used.
The LCD head display corresponds to the speed of the locomotive; 6) It is applicable to various photoelectric speed sensors of the DF-16 type.
1.2 main system block diagram
The main system block diagram is shown in Figure 1.
2.1 hardware circuit design
2.1.1 MCU to simulate the pulse signal generation circuit of the sensor
Since the operating frequency of the MCU is up to 12 MHz, and the highest frequency of the locomotive speed signal is 4.23 KHz (according to 300 km/h), the accuracy of the analog signal is set by the single-chip microcomputer ("0.05%"), and the operation is simple and the interface is friendly. .
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