Vehicular Fluid Injection Voltage Converter for Heating Control
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Solution Overview
Problem
Existing vehicular fluid injection systems face challenges in maintaining consistent heating power and controlling temperature fluctuations due to varying power supply voltage, leading to issues like overheating or insufficient thawing of ammonia precursor solutions used in SCR systems, which affects NOx emission compliance and component safety.
Innovation Solution
A vehicular fluid injection system with a voltage converter between the power source and heating element, using a DC-to-DC converter to regulate heating voltage and power, ensuring a constant heating voltage and power over the 9-16V battery range, and optionally integrating PWM for further power regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a PTC heating element is used for self-regulation, then overheating is avoided, but heating power decreases when warm and current consumption varies with temperature making diagnosis difficult
Solution Approach 1:
The patent uses a voltage converter to change the electrical parameter (voltage) supplied to the heating element, converting variable vehicle battery voltage (9-16V) into a stable heating voltage. This allows the heating element to operate at consistent power levels regardless of battery state of charge or electrical load conditions, resolving the contradiction between overheating prevention and adequate heating power availability.
2Productivity
If heating power is increased for rapid thawing, then cold start performance improves, but risk of overheating and thermal stress on components increases
Solution Approach 1:
The patent implements a control unit that monitors the heating process and regulates power delivery through the voltage converter. This feedback mechanism allows the system to deliver high power when needed for rapid thawing while automatically reducing power when temperature thresholds are approached, thus achieving fast thawing performance without excessive overheating risk.
Solution Approach 2:
The voltage converter enables dynamic adjustment of heating power based on real-time conditions. The system can rapidly scale power delivery from low to high levels and vice versa, providing the flexibility needed for rapid thawing while maintaining safety through continuous adaptability to temperature and power supply conditions.
3Device complexity
If direct connection from power source to heating element is used, then system complexity is reduced, but heating power fluctuates with power supply voltage variations
Solution Approach 1:
The voltage converter serves as an intermediary component between the power source and heating element. While it adds a component to the system, it provides essential voltage regulation that ensures consistent heating power delivery despite variations in vehicle battery voltage, electrical load changes, or alternator output fluctuations, thus resolving the contradiction between system simplicity and power consistency.
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 provides consistent heating performance, reduces thermal stress on components, improves electromagnetic compatibility, and ensures rapid thawing while preventing overheating, thus enhancing compliance with emission standards and extending component lifespan.
Implementation Method 1
the amount of heat dissipated by the resistive element will also fluctuate
Implementation Method 2
heat dissipated by the resistive element
Data Source
AI summary
A vehicular fluid injection system including a storage tank, an injection line, a heating system including an electrical heating element being powered by a power source, and a voltage converter inserted between the power source and the heating element, alone or combined with a PWM power regulation.