Fuel Injection Feed Pump Control for Drive Area Cooling
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Solution Overview
Problem
Existing fuel injection devices for internal combustion engines often fail to ensure adequate lubrication and cooling of the high-pressure pump's drive area, especially at high fuel temperatures and varying engine loads.
Innovation Solution
The fuel injection device incorporates a control system that adjusts the feed pump's delivery rate based on engine parameters and fuel temperature, ensuring sufficient lubrication and cooling by routing excess fuel through the high-pressure pump's drive area and using an overflow valve to maintain optimal pressure, independent of the high-pressure pump's delivery quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feed pump's delivery rate is controlled based on engine parameters and fuel temperature, then adequate lubrication and cooling of the high-pressure pump drive area is ensured, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The control device adjusts the feed pump's delivery rate by changing operational parameters (delivery quantity) based on fuel temperature and engine load conditions. This allows the system to adapt to varying thermal conditions and ensure adequate lubrication without adding complex mechanical structures.
Solution Approach 2:
The feed pump serves multiple functions: it supplies fuel to the high-pressure pump for injection and simultaneously provides lubrication and cooling to the drive area. By controlling the delivery rate, the system achieves both fuel delivery and thermal management functions through a single component.
2Reliability
If excess fuel is routed through the drive area for lubrication and cooling, then the drive area is adequately lubricated and cooled, but energy is wasted by circulating fuel that does not contribute to injection
Solution Approach 1:
The system deliberately routes more fuel through the drive area than is strictly necessary for injection purposes. This excessive action ensures adequate lubrication and cooling margins, especially under high-load conditions, accepting some fuel waste as a trade-off for reliable thermal management.
Solution Approach 2:
The fuel itself serves dual purposes: as the working medium for injection and as the lubricant/coolant for the drive area. The system uses the fuel's own flow to provide cooling and lubrication, eliminating the need for separate cooling systems.
3Ease of operation
If the feed pump delivers a fixed quantity of fuel, then the system is simpler to operate, but adequate lubrication and cooling cannot be ensured under varying engine loads and fuel temperatures
Solution Approach 1:
The feed pump's delivery rate is made dynamic rather than fixed. The control device continuously adjusts the delivery quantity based on real-time conditions (fuel temperature, engine load), allowing the system to adapt automatically without requiring manual intervention or complex mechanical adjustments.
Solution Approach 2:
The system uses feedback from temperature sensors and engine parameter sensors to adjust the feed pump's delivery rate. This closed-loop control ensures that lubrication and cooling requirements are met under varying conditions while maintaining automated operation.
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 ensures consistent lubrication and cooling of the high-pressure pump's drive area, even at high loads and temperatures, while optimizing energy usage and extending the service life of components by adjusting fuel delivery dynamically.
Implementation Method 1
sufficient lubrication and/or cooling of the drive area of the high-pressure pump is ensured even at high fuel temperatures
Data Source
Figure 1
Figure 2
AI summary
The fuel injection device for an internal combustion engine comprises a feed pump (10) which has an electric drive (14), by means of which feed pump (10) fuel is fed from a fuel storage tank (12) into a low-pressure region to the suction side of at least one high-pressure pump (20). By means of the high-pressure pump (20), fuel is fed into a high-pressure region (42) in which at least one injector (44) is provided, by means of which fuel is injected into the internal combustion engine. The fuel injection is controlled by means of an electric control device (46). Arranged in the low-pressure region is a pressure sensor (56) which is connected to the control device (46), and the electric drive (14) of the feed pump (10) is activated by the control device (46) in order to set a feed quantity of the feed pump (10) which is variable as a function of at least one operating parameter of the internal combustion engine and/or of the high-pressure pump (20). The drive (14) of the feed pump (10) is in particular activated by the control device (46) in such a way that, at a high load of the internal combustion engine and/or at a high rotational speed and/or at a high fuel temperature, a greater fuel quantity is fed by the feed pump (10) into the low-pressure region than at a low load and/or a low rotational speed and/or a low fuel temperature.