Compression Ignition Engine Start-Up with Preheated Fuel Rack Positioning
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Solution Overview
Problem
Starting a compression ignition engine when cold can be challenging due to the slow adjustment of the fuel rack to the desired fuel injection position, often exacerbated by ice buildup in cold climates, leading to prolonged cranking times.
Innovation Solution
A warm-up routine that includes preheating the engine with a glow plug and moving the fuel rack to the start-up position during this routine, followed by cranking, ensuring the fuel rack is in the correct position before engine start, and maintaining it until the engine starts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the fuel rack is adjusted to the start-up fuel injection position during the warm up routine, then the engine start time is reduced, but the fuel rack adjustment speed is limited by ice buildup in cold climates
Solution Approach 1:
The fuel rack is moved to the start-up fuel injection position during the warm up routine, which occurs before the engine cranking begins. This preliminary positioning ensures that when cranking starts, the fuel rack is already in the correct position and can immediately deliver the required fuel quantity, eliminating the delay that would occur if adjustment happened during cranking.
Solution Approach 2:
The patent anticipates the problem of slow fuel rack adjustment due to ice buildup in cold climates by proactively positioning the fuel rack during the warm up routine. This preliminary anti-action counteracts the expected delay caused by ice, ensuring the fuel rack is ready before cranking begins and preventing extended start times.
2Productivity
If the fuel rack actuator moves the fuel rack during the warm up routine, then the fuel delivery is optimized for start-up, but the fuel rack may not reach the desired position instantaneously in cold climates
Solution Approach 1:
The fuel rack positioning is performed during the warm up routine, which is a preparatory phase before engine operation. This timing allows the system to optimize fuel delivery settings in advance, ensuring the fuel rack is in the correct position for start-up fuel injection while accounting for the slow adjustment speed in cold conditions.
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
Enables quick and successful engine start with reduced unnecessary cranking time by ensuring the fuel rack is in the correct position at the end of the warm-up routine, thus facilitating rapid fuel delivery and engine ignition.
Implementation Method 1
using a glow plug of the compression ignition engine to perform a warm up routine to preheat the compression ignition engine
Data Source
AI summary
A method of starting a compression ignition engine is provided. The method comprises using a glow plug of the compression ignition engine to perform a warm up routine to preheat the compression ignition engine. During the warm up routine, a fuel rack actuator of the fuel rack is actuated which controls the quantity of fuel to be injected into the compression ignition engine such that the fuel rack is in a start-up fuel injection position by the end of the warm up routine. Following the end of the warm up routine, the compression ignition engine is cranked until the compression ignition engine starts, wherein the fuel rack actuator maintains the start-up fuel injection position of the fuel rack until the compression ignition engine has started.