Vehicle Cabin Heating With Ceramic Igniters for Fast Warm-Up
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Solution Overview
Problem
Existing motor vehicle heating systems lack rapid response times and efficiency, particularly in cold weather, and often require significant modifications or additional components to achieve effective heating.
Innovation Solution
A heating system utilizing miniature silicon nitride or molybdenum disilicide gas igniters capable of reaching 1,800°F in three seconds or less, integrated with an engine cooling assembly and air flow management, which includes geometric modifications to the ceramic igniters to enhance electrical properties and reduce the need for a conductive core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electric heating coils are used, then heating function is provided, but response time is slow and heating efficiency is insufficient
Solution Approach 1:
The patent changes the material parameter of the heating element from conventional electric coil to ceramic igniter, which operates at different temperature parameters (1,800°F vs lower temperatures) and achieves faster heating response (3 seconds vs much longer times). This material and parameter substitution directly resolves the contradiction between heating speed and response time.
2Productivity
If multiple heating components are added to improve heating speed, then heating efficiency improves, but device complexity and cost increase
Solution Approach 1:
The patent extracts the heating function from the complex multi-component system (electric coils, fans, ducts) and concentrates it into a single ceramic igniter element. This simplification maintains high heating efficiency while reducing device complexity, directly addressing the contradiction between productivity and device complexity.
Solution Approach 2:
The ceramic igniter serves multiple functions simultaneously: it acts as the primary heating element, the control mechanism (through its rapid response), and the temperature regulation point. This multi-functionality eliminates the need for separate heating components, reducing complexity while maintaining high heating efficiency.
3Power
If high power heating elements are used to heat rapidly, then heating speed improves, but energy consumption and heat control difficulty increase
Solution Approach 1:
The patent implements a feedback control system where the ceramic igniter's rapid temperature response (reaching 1,800°F in 3 seconds) provides immediate feedback on heating status. This allows the control system to adjust power delivery precisely, maintaining high heating power when needed while reducing energy consumption by eliminating the need for prolonged high-power operation required by conventional systems.
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 provides rapid and efficient heating of the vehicle interior, maintaining comfort with minimal cost additions and ensuring long-term reliability, while avoiding excessive heat through temperature control.
Implementation Method 1
An electric heater that is capable of being heated to 1,800° F. (red heat) in three (3) seconds or less is disposed in the air flow to heat the air passing through the housing
Implementation Method 2
means for heating the flow of air by exposure to heated coolant
Data Source
AI summary
A heating system for a motor vehicle having an electrical supply circuit and an engine liquid cooling assembly includes a housing structure having an inlet duct, an air outlet duct and means such as a fan for creating a flow of air into the inlet and out of the outlet. The electric heater is capable of being heated to 1,800° F. in three (3) seconds or less disposed in said air flow to heat the air passing therethrough. The system further includes means for heating the flow of air by exposure to heated coolant and means for deactivating said electric heater when the air flow is being heated by the heated coolant.