1. EBS introduction

1.1 what is EBS

EBS operates with electronic signals. The EBS electronic control unit controls the system through these signals and can communicate with the individual components at any time. The valves on the brake cylinders generate the required braking pressure according to the control signals. Speed sensors, installed on the wheels of the vehicle for the integrated ABS function, constantly provide the EBS with up-to-date wheel speed information. Different integrated brake management functions detect any deviations from normal driving conditions and intervene in the driving process in the event of hazards. Apart from improving safety, specific functions also optimize driving comfort and lining wear. If the electronic control system malfunctions, all valves simultaneously coordinate operation as in a conventional pneumatic system. In this case, backup pressures are conducted to the brake cylinders where the pneumatic system is effectively applied. What is known as a backup valve blocks the effect of the pneumatic circuit on the rear axle brake cylinderswhile EBS functions normally.

The EBS system mainly includes EBS central module, Brake signal transmitter, 1-channel axle modulator, 2-channel axle modulator, trailer control valve, ESC control valve, ABS solenoid valve, ABS sensors, Wear sensors, Steering angle sensor.

 1.2 what are the advantages of vehicle mounted EBS

• horter brake response time, greatly improving the vehicle brake reaction speed, shorter braking distance,
  
• Comfortable and stable braking “feeling”,
  
• Independent monitoring of load status,,
  
• Standardization and high integration to the system components, reduce production and installation cost, make the vehicle more economical. 
  

2. EBS Proportional Relay Valve

2.1  Function of EBS Proportional Relay Valve

The proportional relay valve is used in the electronically controlled braking system  to modulate the braking pressure on the front axle. It comprises the proportional  solenoid valve, relay valve and pressure sensor. The electrical actuation and      monitoring are carried out by the central module. In the proportional relay valve,   the electronically received nominal values are implemented using a proportional solenoid valve in a control pressure for the relay valve. The proportional relay valve output pressure is proportional to this pressure. The pneumatic drive on the relay valve takes place via the brake signal transmitter pneumatic circuit. This backup pressure is added to the electro-pneumatic pressure in the EBS versions [A] to [E] and the version [I] for buses. The proportional relay valve matches the added pressure to the nominal value before being set. In case of a backup, the complete relay pressure is controlled this way.

2.2 Main parameters of components to the EBS proportional relay valve

My company's 2.3 proportional relay valve

The proportion of 3.4 following the detection report operated valve

3.4.1 proportional relay valve integrated test report

3.5 product drawings