Weight sensor

    The weight sensor sensor is composed of connectors, limit devices and junction boxes. It can also be equipped with external equipment such as large-screen displays, computers, and stabilized power supplies.

    Working principle

    The weighed object or truck is placed on the carrier table, under the action of gravity, passing The load carrier transmits gravity to the load cell, deforms the elastic body of the load cell, and the strain gauge bridge attached to the elastic body loses balance, and outputs an electrical signal proportional to the weight value, which is amplified by the linear amplifier. It is converted into digital signal by A/D, and the weight signal is processed by the CPU of the instrument, and then the weight data is displayed directly. After the printer is configured, the weighing data can be printed and recorded. If the computer is configured, the measurement data can be input into the computer management system for comprehensive management. A strain gauge is pasted on the elastic body of the load cell to form a Wheatstone bridge. When there is no load, the bridge is in a balanced state and the output is zero. When the elastic body bears a load, each strain gauge will generate a strain proportional to the load. The external load can be measured from the output voltage, and it can be connected to the host computer through the communication interface of the instrument.

    Used in smart airbag systems. Smart airbags add sensors to the common type to detect whether the occupant in the seat is a child or an adult. What is the height of their seat belts and their positions? By collecting these data, the electronic The computer software analyzes and processes the expansion of the airbag to make it play its best role, avoid unnecessary expansion of the airbag, and greatly improve its safety function. Smart airbags have two more core components than ordinary airbags, namely the sensor and its supporting computer software. The sensors currently in use mainly include: weight sensors, which sense whether there is a person, whether it is an adult or a child, according to the weight on the seat; electronic area sensors. It can generate a low-energy electronic area in the cab, and measure the current passing through the area to determine the presence and position of the occupants; infrared sensors detect the presence of people based on heat to distinguish them from inanimate things; optical sensors. For example, the same camera looks at the seat and compares it with the stored image of the empty seat to determine the presence and position of the human body; the ultrasonic sensor detects the occupant’s status by transmitting ultrasonic waves and analyzing the reflected waves after encountering objects. Presence and location. Another important task in the design and development of smart airbags is to compile computer software.

    Generally speaking, computer software should be able to determine the size and weight of the occupant, whether the seat belt is fastened, the position of the person on the seat, the speed of the vehicle at the time of the collision, and The degree of impact, etc., and respond in an instant, adjust the timing, speed and degree of airbag inflation, so that the airbag can provide the most reasonable and effective protection for passengers, especially to reduce the damage to children and other short-sized people.