Diesel Glow Plug Temperature Control via Autonomous Target Setting
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Solution Overview
Problem
The existing control systems for diesel engine glow plugs require complex mutual adjustments between the engine control unit and the glow plug control unit, limiting independence and flexibility in design and operation, and do not effectively adapt the glow plug temperature to varying engine conditions, which affects ignition and emissions.
Innovation Solution
The engine control unit specifies a target temperature for the glow element, which is transmitted to the glow plug control unit to implement using stored algorithms and characteristic values, allowing independent operation and adaptive temperature adjustment based on engine conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If complex mutual adjustments between engine control unit and glow plug control unit are implemented, then glow plug temperature control is achieved, but system complexity and control effort increase
Solution Approach 1:
The glow plug control unit autonomously determines the target temperature for the glow element based on engine operating conditions (coolant temperature, engine speed, load) without requiring complex coordination with the engine control unit. The system serves itself by having the glow plug controller independently make temperature decisions based on stored characteristic values and current engine parameters.
Solution Approach 2:
The control system is divided into independent functional segments: the engine control unit handles engine management while the glow plug control unit independently handles glow plug temperature control. This segmentation allows each unit to operate autonomously with simplified interfaces, reducing overall system complexity while maintaining effective temperature control.
2Ease of operation
If predetermined temperature control is used, then control implementation is simplified, but adaptability to varying engine conditions is reduced
Solution Approach 1:
The target temperature is made dynamic rather than fixed. The glow plug control unit continuously adjusts the target temperature based on real-time engine conditions including coolant temperature, engine speed, and load. This dynamic adaptation allows the system to respond to varying operating conditions while maintaining straightforward control implementation through automated parameter adjustment.
Solution Approach 2:
The system changes the target temperature parameter according to engine operating conditions. Stored characteristic values provide baseline temperatures that are modified based on current engine parameters, enabling the system to adapt to different operating regimes (cold start, warm operation, high load, idle) without complex control logic.
3Reliability
If glow plug temperature is optimized for immediate ignition, then ignition reliability improves, but service life is reduced
Solution Approach 1:
The glow plug operation uses periodic heating cycles rather than continuous high-temperature operation. The control unit applies heating voltage in controlled periods to reach target temperatures for ignition support, then reduces or stops heating when target temperature is achieved. This periodic action pattern maintains ignition reliability while reducing cumulative thermal stress on the glow plug element.
Solution Approach 2:
The system applies partial heating action - using just enough heating voltage and duration to reach the required target temperature for reliable ignition, rather than continuously applying maximum heating power. The control unit monitors temperature and stops heating when the target is reached, avoiding excessive thermal exposure that would reduce service life while maintaining sufficient ignition reliability.
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 reduces the effort in controlling glow plugs, optimizes their temperature for improved ignition and reduced emissions, extends their service life, and allows for more flexible engine operation, including supporting combustion over longer periods and reducing pollutant emissions.
Implementation Method 1
controls the electrical power supplied to the glow plugs... rapid heating of the glow plugs during the pre-heating phase is energy-controlled
Implementation Method 2
Glow plugs are designed to ensure reliable ignition of the fuel-air mixture... maintain a smooth idle during an afterglow phase
Data Source
Figure 1
AI summary
The method involves having a housing which is arranged over a glow element. A motor control unit is provided having a glow control device and receives default controls. The engine control unit detects a size which is a measure of temperature of the glow element. The size is transmitted as a target to the glow control device which is an algorithm that is stored. Stored parameters are considered by the algorithms and implemented.