Injector Wiring Integration for Exhaust NOx Reduction
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Solution Overview
Problem
The complexity of incorporating a system for injecting a reducing agent into an internal combustion engine vehicle's exhaust line is exacerbated by the need to route electrical wiring through sensitive heat areas, particularly near the catalytic converter, and requires additional connectors and wiring modifications.
Innovation Solution
Combining the electrical power supply cable for the injector with the heated pipe for the reducing agent, using a single pair of wires for both heating and control functionalities via a diode and polarity inverter, and routing these within or alongside the supply pipe to minimize connections and leverage thermal protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate electrical cables are used for heating and controlling the injector, then the heating function can be reliably provided, but the wiring complexity increases and more connectors are required
Solution Approach 1:
The patent combines the heating cable and control cable into a single integrated electrical cable that runs from the pump module to the injector. This single cable contains both the heating conductors and control conductors, eliminating the need for separate cables and reducing the number of connectors required at the injector location.
Solution Approach 2:
The integrated electrical cable serves multiple functions simultaneously: it provides both heating power to prevent freezing of the reducing agent and control signals to operate the injector. This multi-functional cable reduces wiring complexity while maintaining all necessary functions.
2Ease of operation
If the electrical control cable is routed separately from the heated pipe, then control and heating can be independently managed, but the wiring must be routed through sensitive heat areas near the catalytic converter
Solution Approach 1:
The control cable is merged with the heated pipe for the reducing agent, running alongside or within the same protective conduit. This integration allows both control and heating functions to be managed together while the pipe itself provides thermal protection to the control cable from heat exposure near the catalytic converter.
Solution Approach 2:
The heated pipe acts as an intermediary protective structure that shields the control cable from thermal harm. By routing the control cable within or alongside this thermally protected pathway, the system avoids direct exposure to harmful heat while maintaining independent control capability.
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
This solution reduces wiring complexity, optimizes connections, and allows for efficient sequential heating and injection by using the same electrical wires for both control and heating, thereby reducing the time and energy required for injector control.
Implementation Method 1
an electrical cable for heating the pipe for supplying the reducing agent
Implementation Method 2
a diode means between the first and second wires, which is connected in parallel with the actuator of said at least one injector such that, the injection system comprising a device for reversing the control polarity
Data Source
AI summary
Disclosed is a system for injecting an agent for reducing oxides of nitrogen into an exhaust line of an internal combustion engine vehicle, including: a pump for drawing the reducing agent from a tank and introducing it into the exhaust line; an injector for introducing the reducing agent into the exhaust line; an electronic unit for driving both the injector and the pump; a pipe for supplying the reducing agent linking the pump to the injector; an electrical cable for heating the supply pipe, the pump being arranged a certain distance away from the injector, and the electronic unit for driving both the injector and the pump being arranged in a module with the pump and connected to the injector via an electrical control cable, the latter being associated with the pipe for supplying the injector with the reducing agent.