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mercury outboard speedometer tube
Mercury outboard speedometer tube: Structure of mercury type deceleration sensor:When the car is braking, if the deceleration is small and the mercury ball in the glass tube is basically immobile, the output electrodes 1 and 2 are connected to the ground, which means that the car is on the road with a small adhesion coefficient,When the car is braking, the deceleration is large, and the Mercury moves forward in the glass tube due to inertia, then the output electrode 1 is connected to the ground, and the output electrode 2 is disconnected from the ground, which means that the car is on the road with a large adhesion coefficient.
Function: deceleration sensor, also known as G sensor, is usually used in ABS / ASR and other systems related to vehicle driving and braking control of four-wheel drive vehicles.When the vehicle is braked on the road with high adhesion coefficient, its deceleration is large, and when it is braked on the road with low adhesion coefficient, its deceleration is small. When the vehicle is running on the road with low adhesion coefficient, such as snow and ice, take corresponding measures to improve the braking performance. When a car runs at a low coefficient of adhesion, its driving wheels usually slip. On a two wheel drive vehicle, the ECU of the ABS system can judge the slip condition of the driving wheels according to the signal transmitted from the wheel speed sensor.The ABS system will adopt different anti lock braking methods on different adhesion coefficient roads.Engine speed sensor: its function is to detect the engine speed and input the detection result to the automobile instrument system to display the engine working condition; Or input ECU of engine control system and some chassis control systems for fuel injection quantity, ignition advance angle, power transmission and other control.
1. Function of deceleration sensor
Configured to obtain a vehicle deceleration signal; After the signal is sent to ECU, the adhesion coefficient of the road surface is judged.
2. Type of deceleration sensor
Deceleration sensors include photoelectric, mercury, differential and variable voltage sensors.When the vehicle is running normally, the iron core in the coil of the differential transformer is in the middle of the coil, and the output voltage is "0";When the vehicle decelerates, the induction potential in the differential transformer will change due to the forward movement of the iron core under the action of inertial force, and this change will be used as the control signal for ABS operation.
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