Fuel Injection Maintenance System In-Situ Testing
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Solution Overview
Problem
Current maintenance processes for fuel injection systems in internal combustion engines are time-consuming and costly due to the need for demounting components for testing, and there is no effective means to clean blocked actuators, which are often obstructed by lacquer deposits.
Innovation Solution
A portable maintenance system that includes a manual control unit connected to a hydraulic unit with a test solenoid valve and pressure sensor, allowing for in-situ electrical and hydraulic measurements, and a cleaning kit to address lacquer deposits, enabling efficient diagnosis and maintenance without removing the fuel injection system from the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actuators and high pressure pump are removed from the vehicle for testing, then hydraulic test can be performed, but maintenance time and cost increase
Solution Approach 1:
The maintenance system is designed as a universal platform that can test multiple different fuel injection systems through interchangeable adapters. The control unit and hydraulic unit remain constant while only the adapter needs to be changed, allowing the same equipment to maintain various injection system types without requiring separate dedicated test benches for each system.
Solution Approach 2:
An adapter serves as an intermediary component that connects the maintenance system to the fuel injection system. The adapter includes a body with inlet and outlet ports that interface with the high pressure pump and actuators, enabling the maintenance system to perform tests without permanently removing components from the vehicle.
2Measurement precision
If actuators are removed for electrical measurements, then complete diagnosis can be performed, but operational efficiency decreases
Solution Approach 1:
The adapter acts as an intermediary that provides electrical connection points for the maintenance system to measure electrical resistance of actuators and solenoid valves while they remain installed in the fuel injection system. This eliminates the need to physically remove components for electrical testing.
Solution Approach 2:
The fuel injection system components (actuators, solenoid valves) remain in their installed positions and can be tested in-situ without requiring removal or disassembly. The system performs self-diagnosis through the connected maintenance equipment, eliminating the need for component removal service.
3Device complexity
If standard multimeter is used for electrical measurements, then simple equipment is required, but measurement accuracy and completeness are limited
Solution Approach 1:
The maintenance system merges electrical measurement capabilities (for measuring resistance of actuators and solenoid valves) with hydraulic measurement capabilities (for measuring pressure in the hydraulic circuit) into a single integrated control unit. This combination provides comprehensive diagnostics without requiring multiple separate tools.
Solution Approach 2:
The control unit is designed as a multi-functional device that can perform various measurement operations including electrical resistance measurements, hydraulic pressure measurements, and control of test solenoid valves. This universal measurement platform replaces the need for multiple specialized tools.
4Reliability
If lacquer deposits are present in actuators, then system operation is compromised, but no cleaning means are available
Solution Approach 1:
The adapter body serves as an intermediary that provides access to the internal passages of the fuel injection system where lacquer deposits accumulate. The adapter includes a leakage port and internal channels that allow cleaning solutions to be introduced and circulated through the actuators and solenoid valves to remove deposits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system allows for quick and accurate diagnosis and maintenance of fuel injection systems, reducing costs and time by enabling in-situ testing and cleaning, and is adaptable to various types of injection systems, improving operational efficiency for maintenance professionals.
Implementation Method 1
The hydraulic unit includes a test solenoid valve and a test pressure sensor mounted in a body having an inlet port, an outlet port and a leakage port. In use the test solenoid valve generates an artificial leak between a minimum fuel leakage volume and a maximum leakage volume inclusive.
Implementation Method 2
In use the test pressure sensor measures the pressure in the body of the hydraulic unit and generates a signal indicating the read pressure value, said signal being sent to the manual control unit.
Implementation Method 3
The maintenance system measures the electrical resistances of the solenoid valve and the metering solenoid valve.
Data Source
AI summary
The invention relates to a maintenance system for a fuel injection system provided in an internal combustion engine, the fuel injection system defining a hydraulic circuit having a high-pressure pump, a solenoid valve, a pressure sensor, a metering solenoid valve, a common rail and injectors. The maintenance system includes a manual control unit connected to a hydraulic unit, the hydraulic unit being capable of being inserted into the hydraulic circuit of the fuel injection system and including a test solenoid valve and a test pressure sensor mounted in a body provided with an inlet mouth, an outlet mouth and a leakage mouth.