Passive low-power-consumption torque sensor of vehicle transmission shaft

Abstract

The invention relates to a passive low-power-consumption torque sensor of a vehicle transmission shaft. The torque sensor comprises a strain gauge, a connecting wire, a signal processing and low-power-consumption transmitting module, an energy accumulator and a power supply module. The power supply module comprises a mounting shell, a piezoelectric material, a centrifugal magnetic block, a power lead, an induction coil and a spring. The mounting shell rotates along with a vehicle transmission shaft, and the power supply module has two power generation modes that firstly, the centrifugal magnetic block impacts the piezoelectric material under the action of rotary centrifugal motion and vibration to generate a current; and secondly, the magnetic induction lines are cut by the induction coilto generate a current when the centrifugal magnetic block moves in the radial direction. Passive power supply, signal wireless transmission and low-energy-consumption signal transmission of the torquesensor are realized, and long-time torque signal acquisition can be performed; and the requirements for testing of shaft parts in vehicles such as automobiles and tractors are met, and especially under the condition of tractor field operation, guarantee is provided for long-time load spectrum acquisition and long-term fault monitoring of a vehicle transmission shaft.

Description

technical field [0001] The invention belongs to the field of sensor measurement, in particular to a passive low-power torque sensor for a vehicle transmission shaft. Background technique [0002] Torque sensors are widely used in reliability and durability tests of automobiles, tractors, engineering vehicles and other vehicle fields. The vehicle transmission shaft torque test has two main purposes: the first is to study the dynamic characteristics of the vehicle such as acceleration performance, climbing performance and power matching; the second is to apply it to the road load spectrum collection test and bench fatigue test to study the fatigue durability. [0003] According to the test principle, the torque sensor can be divided into strain type, angle phase difference type and magnetoelectric type. Among them, the strain gauge torque sensor is the most mature technology and the most widely used one at home and abroad. With the development of new technologies, new types...

AI Technical Summary

Problems solved by technology

For example, the Chinese invention patent application (application number: 201210118608.5) discloses a strain-type wireless sensor, and proposes a perfect solution for the torque-speed test system, but the problem of passive power supply is not solved and the power consumption of the communication module is relatively high. Unable to complete long test

Considering the power supply and wireless transmission of the torque sensor, there is no suitable product in China that can meet the long-term data collection and power system fault monitoring of off-road vehicles such as tractors under harsh field operations

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