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HOWO 336 HOWO 371 HOWO 420 HOWO T7 Delphi original measuring unit UL072659.2
This is a Delphi-manufactured fuel metering unit. It's a core component used to control the engine's fuel supply and is part of the electronic control system for the fuel delivery system.
Core Function:
1. Precise Fuel Supply: Responsible for accurately calculating and controlling the fuel pressure and flow rate entering the fuel injectors based on signals such as engine speed, load, and throttle opening.
--The system receives and analyzes the engine's crankshaft position signal to determine whether the engine is idling, accelerating, or climbing in order to implement further motion control.
--Based on the engine's crankshaft position and load requirements, it calculates the precise amount of fuel (ml/s) needed by the engine at that moment.
--Electronic valve regulation: Through an internal solenoid valve, it controls the timing and amount of fuel flow to the injectors, ensuring that each injection is executed strictly according to the calculated data.
2. Energy Saving and Emission Reduction: Through precise fuel metering, it ensures the engine achieves the optimal air-fuel ratio under different operating conditions, thereby improving fuel economy and reducing exhaust emissions.
3. System Safety: Typically works in conjunction with a rail pressure limiting valve to prevent system damage caused by excessive fuel pressure.
Working principle：
1. Mechanical Drive：This measuring unit integrates a high-precision mechanical pump whose rotational speed is strictly synchronized with the engine speed (synchronous drive).
First, it compresses low-pressure fuel (drawn from the fuel tank) into high-pressure fuel (supplying it to the fuel injectors) to overcome the high-pressure resistance of the injectors.Second, it works in conjunction with a rail pressure limiting valve to ensure that fuel pressure fluctuates within a safe range, preventing system explosion.
2.Fail-Safe & Diagnostics：
--If the fuel pressure is too high, it will signal to cut off the power supply to prevent the fuel pump from overloading and trigger its own overpressure protection.
--If the internal circuitry is overloaded (like the motor burns out), it will cut off the power supply to protect the system.
--When the engine starts, it will perform a self-diagnosis to ensure that the internal circuitry and mechanical structure are functioning correctly before commencing operation.
3.System Integration：Its most critical function is to work in coordination with the engine.
This measuring unit strictly follows the instructions of the ECU (Engine Control Unit). The ECU calculates the required air-fuel ratio (AFR) in real time through sensors (such as air flow meter and oxygen sensor) and sends this instruction to measuring unit. It also feeds back the output fuel pressure and flow to the ECU, forming a closed-loop control system to ensure the balance between engine power output and fuel consumption.
Failure performance
Overfueling：Fault codes: P0090 - Fuel Pressure Sensor Low or P0084 - Fuel Pressure Too Low
Underfueling: P0086 - Fuel Pressure Too High or P0092 - Fuel Pressure Sensor High.
Electronic control malfunction: P0120 - Throttle Position Sensor (TPS) Malfunction.
Summary of fault symptoms:
Engine stalls, black smoke emission, unstable idling, insufficient power, increased noise, and the fault light remains constantly on.
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