High Pressure Fuel Pump Cooling via Intermittent Direct Injection
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Solution Overview
Problem
High pressure fuel pumps in internal combustion engines experience temperature and pressure build-ups during periods of direct injection disablement, leading to potential damage and noise issues due to prolonged exposure to elevated conditions.
Innovation Solution
Implementing a method to intermittently reactivate the high pressure fuel pump and direct injectors during warm idling conditions, adjusting fuel flow to maintain the pump temperature within a desired range, and resuming port injection once the temperature is below the threshold, thereby reducing component damage and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If direct injection is disabled during warm idling to reduce noise and emissions, then NVH impact and particulate matter emissions are reduced, but high pressure fuel pump temperature rises causing potential internal damage
Solution Approach 1:
The system implements periodic reactivation of the high pressure fuel pump and direct injectors during warm idling conditions. When the pump temperature exceeds a threshold, the system temporarily enables direct injection operation to cool the pump, then disables it again when temperature returns to normal range. This periodic on-off action allows the system to maintain pump temperature within safe limits while minimizing the overall NVH impact and emissions.
Solution Approach 2:
The system changes the operational parameters of the fuel injection system by dynamically adjusting between port injection only mode and direct injection mode based on pump temperature conditions. This parameter change allows the system to switch between different injection modes to control pump temperature, balancing the trade-off between noise reduction and pump durability.
2Object-generated harmful factors
If direct injection is continuously disabled to minimize ticking noise, then NVH impact is reduced, but fuel trapped in the DI fuel rail expands due to high temperatures causing pressure build-up
Solution Approach 1:
The system uses periodic reactivation of the direct injection system to relieve pressure build-up in the DI fuel rail. By temporarily enabling direct injection when temperature and pressure thresholds are exceeded, the system allows trapped fuel to be circulated and cooled, preventing excessive pressure accumulation while maintaining minimal noise operation during normal warm idling conditions.
Solution Approach 2:
The system implements feedback control by monitoring DI fuel rail temperature and pressure conditions, and reactively adjusting direct injection operation accordingly. When temperature and pressure exceed thresholds, the system activates direct injection to cool and depressurize the fuel rail, then deactivates it when conditions return to normal, creating a closed-loop control system that balances noise and pressure management.
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 effectively cools the high pressure fuel pump, reduces the risk of internal damage, and minimizes objectionable noise associated with direct injection system operation.
Implementation Method 1
fuel flow through the HPP and the DI system may be continuously adjusted based on an expected (e.g., modeled) HPP temperature to provide sufficient flow to cool the HPP
Data Source
AI summary
Methods and systems are provided for temperature control of a high pressure pump (HPP) of a direct injection system. When direct injection is disabled, the HPP and the associated direct injectors are intermittently operated when the HPP temperature rises above a modeled threshold temperature. The HPP and injectors are operated until the HPP temperature falls below the modeled threshold temperature.