History Of Sensor Development
In the 1960s, cars only had oil pressure sensors, oil quantity sensors, and water temperature sensors, which were connected to gauges or indicator lights.
After entering the 1970s, in order to control emissions, some sensors were added to help control the powertrain of cars, as the catalytic converters, electronic ignition, and fuel injection devices that emerged during the same period required these sensors to maintain a certain air fuel ratio to control emissions. In the 1980s, anti lock braking devices and airbags improved car safety.
As of 2010, sensors were available to measure various fluid temperatures and pressures, such as intake temperature, airway pressure, cooling water temperature, and fuel injection pressure; There are sensors used to determine the speed and position of various parts (such as vehicle speed, throttle opening, camshaft, crankshaft, transmission angle and speed, exhaust gas recirculation valve) (EGR) position, etc; There are also sensors used to measure engine load, knock, misfire, and oxygen content in exhaust gas; Sensors for determining seat position; Sensors for measuring wheel speed, road height difference, and tire pressure in the anti lock braking system and suspension control device; Protecting the airbags of front passengers not only requires more collision sensors and acceleration sensors. In the face of manufacturers providing side volume, overhead airbags, and more sophisticated side head airbags, additional sensors are needed. As researchers use collision avoidance sensors (ranging radars or other ranging sensors) to determine and control the lateral acceleration, instantaneous speed of each wheel, and required torque of a car, the braking system becomes an integral part of the car's stability control system.
The old-fashioned oil pressure sensor and water temperature sensor are independent of each other, and due to clear limits on maximum or minimum values, some of these sensors actually act as switches. As sensors develop towards digitization and digitization, their output values will be more utilized.
