Diesel Fuel Pump Cold Start Control via Temperature Adaptation
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Solution Overview
Problem
Existing fuel pumps for diesel engines face challenges in starting reliably at low temperatures due to increased fuel viscosity, leading to potential false starts and inadequate fuel delivery, as they do not account for temperature-dependent viscosity changes.
Innovation Solution
The integration of a temperature sensor system within the control electronics allows for selection of temperature-dependent start programs, utilizing existing temperature sensors and ohmic resistance measurements to determine fuel temperature and adjust current intensity, ensuring reliable start-up and operation even at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard start program is used for fuel pump operation, then the fuel pump can operate efficiently at normal temperatures, but it fails to deliver adequate fuel at low temperatures due to increased fuel viscosity
Solution Approach 1:
The control system dynamically selects between a standard start program and a low-temperature start program based on detected fuel temperature. This dynamic adaptation ensures the fuel pump operates with appropriate current intensity and timing for the current thermal conditions, resolving the contradiction between efficient normal operation and reliable cold-temperature starting.
Solution Approach 2:
The invention changes operational parameters (current intensity, pulse duration, timing) based on fuel temperature. The low-temperature start program modifies these parameters to provide higher current intensity and extended pumping duration, enabling the fuel pump to overcome increased fuel viscosity at low temperatures while maintaining efficient operation at normal temperatures.
2Reliability
If temperature-dependent control is implemented, then reliable fuel delivery at low temperatures is achieved, but additional temperature sensors and control complexity are required
Solution Approach 1:
The control unit performs multiple functions: it manages the fuel pump operation, detects fuel temperature (using existing sensors or ohmic resistance measurements), and selects appropriate start programs. This multi-functionality eliminates the need for separate temperature sensing systems, achieving cold-start reliability without significantly increasing device complexity.
Solution Approach 2:
The control system uses existing components (temperature sensors already present in the electronic components or ohmic resistance measurements of the electric motor) to determine fuel temperature. This self-service approach allows temperature-dependent control without requiring additional dedicated temperature sensors, maintaining simplicity while achieving reliable cold-temperature operation.
3Reliability
If higher current intensity is used during low-temperature starting, then fuel pump start-up reliability is improved, but energy consumption and motor stress increase
Solution Approach 1:
The low-temperature start program uses extended periodic pumping actions with higher current intensity only during the critical start-up phase. After successful fuel delivery is established, the system transitions to normal operation with standard current levels. This periodic high-intensity approach ensures reliable cold-temperature starting while minimizing overall energy consumption and motor stress.
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 and reliable fuel delivery to the internal combustion engine by optimizing start programs based on fuel viscosity, protecting the electric motor and control electronics, and reducing the risk of false starts, without the need for additional temperature sensors.
Implementation Method 1
The electronic control system is connected to a temperature sensor system that is present in it and is designed as a temperature sensor, in order to determine the temperature of the fuel
Implementation Method 2
an electric motor for driving the pump stage
Implementation Method 3
the pump stage is designed as a displacement pump
Data Source
Figure 1~2
AI summary
The invention relates to a fuel pump (3) for diesel fuel which has different start programmes for supplying an electric motor (4) driving a pump step (5). Selection takes place in accordance with the temperature of the fuel and the frequency of false starts. As a result, the fuel pump (3) has a high degree of operational reliability.