Glow Plug Temperature Regulation via Dynamic Resistance Characteristic
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Solution Overview
Problem
Existing methods for regulating the surface temperature of a glow plug using closed-loop control are limited by the accuracy of the resistance temperature characteristic, resulting in significant control deviations, often exceeding 50 K, due to the non-homogeneous temperature distribution within the heat conductor and its influence on the surface temperature.
Innovation Solution
The resistance temperature characteristic is adjusted based on the current motor operating state by comparing the actual electrical power or voltage required to maintain a target temperature with expected values at a defined reference state, allowing the glow plug control device to infer and correct for deviations, thereby improving temperature regulation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed resistance temperature characteristic is used for closed-loop control, then the control system is simple to implement, but the temperature regulation accuracy deteriorates with significant deviations exceeding 50 K
Solution Approach 1:
The patent applies the dynamics principle by making the resistance temperature characteristic adjustable based on motor operating state. Instead of using a fixed characteristic, the system dynamically adapts the characteristic according to conditions such as cooling air flow and combustion state, allowing the control system to maintain high accuracy across varying operating conditions without requiring overly complex hardware modifications
Solution Approach 2:
The patent implements parameter changes by modifying the resistance temperature characteristic parameters based on detected motor operating state. The system changes the resistance-temperature mapping parameters according to conditions like air-fuel mixture flow and combustion intensity, enabling accurate surface temperature regulation despite variations in operating conditions that would otherwise cause deviations exceeding 50 K
2Measurement precision
If the resistance temperature characteristic is adjusted according to motor operating state, then the temperature regulation accuracy is improved, but the device complexity increases due to additional sensors and control logic
Solution Approach 1:
The patent applies universality by making the glow plug control device perform multiple functions: it not only regulates temperature but also detects motor operating state parameters and autonomously adjusts its own control characteristics. This multi-functionality eliminates the need for separate adjustment mechanisms, reducing overall system complexity while maintaining high temperature regulation accuracy
Solution Approach 2:
The patent implements self-service by enabling the glow plug control device to automatically detect its own operating conditions and adjust its resistance temperature characteristic accordingly. The system uses its own measurements of electrical power, current, and operating state to autonomously optimize its control parameters without requiring external intervention or complex additional control systems
3Measurement precision
If separate sensors and motor control device communication are used to determine motor operating state, then accurate adaptation is achieved, but the effort and system complexity become considerable
Solution Approach 1:
The patent applies self-service by having the glow plug control device independently detect motor operating state parameters using its own measurement capabilities. The system monitors electrical power consumption, current flow, and thermal conditions directly at the glow plug, eliminating the need for separate sensors and complex communication infrastructure while maintaining accurate operating state detection
Solution Approach 2:
The patent uses electrical power and current measurements as intermediary parameters that indirectly provide information about motor operating state. Instead of directly measuring complex operating conditions, the system uses easily measurable electrical parameters as mediators to infer cooling air flow, combustion state, and other operating conditions, simplifying the detection system while maintaining accuracy
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 approach enables more precise control of the surface temperature of the glow plug by accounting for variations in motor operating conditions, reducing control deviations and enhancing the overall quality of temperature regulation.
Implementation Method 1
heat the glow plug for a certain time, e.g., for about one minute, with a constant predetermined electric power
Implementation Method 2
a target resistance is determined from a target temperature by means of a resistance temperature characteristic of the glow plug, and the actual resistance of the glow plug is then regulated to the target resistance by closed-loop control
Data Source
AI summary
A method for regulating the surface temperature of a glow plug is described, wherein the electrical resistance of the glow plug is continuously measured and used to regulate the surface temperature of the glow plug to a target temperature or a target resistance corresponding to the target temperature by means of a resistance temperature characteristic. According to this disclosure, it is provided that the resistance temperature characteristic used for the temperature regulation is adjusted as a function of the present motor operating state.