BOSCH Electronic Fuel Injection Pump CB18

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BOSCH Electronic Fuel Injection Pump CB18

FUNCTION

1. High-Pressure Fuel Generation and Constant-Pressure Supply
This function converts low-pressure fuel into an extremely high-pressure state. Through the reciprocating motion of internal plungers, fuel pressure is elevated; this high-pressure fuel is continuously delivered to and stored within the Common Rail. This process establishes the energetic foundation required by the injectors to achieve high-precision fuel atomization, thereby significantly optimizing thermal efficiency and reducing emissions.

2. Precise Fuel Flow Metering and Proportional Control
The pump integrates an inlet metering valve, which is regulated in real-time via Pulse Width Modulation (PWM) signals from the Engine Control Unit (ECU) to ensure on-demand supply. Based on current engine speed, load, and target rail pressure, the system precisely controls the volume of fuel entering the compression chamber.

3. Integrated Low-Pressure Fuel Delivery and Self-Priming Circulation
A gear-type fuel pump is integrated into the rear end of the drive shaft. This unit utilizes mechanical drive power to generate negative pressure, drawing fuel from the tank and pumping it through the fuel filter before it proceeds to the high-pressure compression stage.

4. Dynamic Rail Pressure Balancing and Pulsation Suppression
Leveraging a structural design featuring symmetrically distributed multiple plungers, the pump generates a continuous and stable series of pressure pulses during operation. In conjunction with the buffering effect of the Common Rail, the pump effectively suppresses pressure fluctuations within the high-pressure lines, ensuring that rail pressure maintains exceptional consistency and linear responsiveness-even under transient engine operating conditions.

Installation Location

It is a mechanically driven component. A high-strength timing gear is mounted at the end of its drive shaft, deriving power through direct engagement with the engine's crankshaft timing gear or an intermediate gear.

Performance Advantages

1. Exceptional Fuel Atomization and Emission Control
Extremely high pressure enables the fuel to undergo ultra-fine atomization upon entering the combustion chamber; the droplet diameter is drastically reduced, thereby significantly increasing the contact surface area between the fuel and air.

2. Precise, Demand-Driven Fuel Supply
The ECU precisely regulates the volume of fuel entering the compression chamber based on real-time operating conditions (e.g., idling, cruising, heavy load).

3. Superior Power Response and Transient Performance
Featuring a symmetrical, multi-plunger layout, the system drastically minimizes fuel supply pulsations, enabling an exceptionally rapid buildup of rail pressure.

4. High Degree of Mechanical Integration and Lightweight Design
The low-pressure transfer pump, high-pressure pump, and metering valve are highly integrated into a single unit, resulting in a precision-engineered, compact structure. This design reduces the number of external pipe connections, significantly lowering the potential risk of leaks while simultaneously reducing the overall weight of the engine.

DETAILS

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