Direct Injection Engine Start Control Device Reducing Sparking Frequency
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Solution Overview
Problem
Direct injection engines face increased electric power consumption due to multiple sparking during startup, as the timing of fuel atomization and vaporization is not consistently optimal, leading to inefficiencies in ignition timing.
Innovation Solution
A start control device for direct injection engines that reduces the number of sparks by learning the ignition timing based on ion current detection, using an electric motor for assist if necessary, and optimizing cylinder phases for efficient startup, thereby minimizing electric power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sparking is performed uniformly a constant number of times for every engine start, then the reliability of engine starting is improved, but the electric power consumption increases
Solution Approach 1:
The patent applies dynamics by making the number of sparking times variable rather than constant. The control device dynamically adjusts the number of sparking operations based on detected engine conditions (rotation speed, temperature, starting history) to achieve reliable starting while minimizing electric power consumption. This resolves the contradiction by adapting the sparking strategy to actual needs rather than using a fixed uniform approach.
Solution Approach 2:
The patent changes the parameter of sparking frequency and number of times based on detected engine conditions. By monitoring rotation speed, temperature, and starting history, the system adjusts the sparking parameters (number of times, interval periods) to match actual engine state, thereby reducing unnecessary sparking operations and electric power consumption while maintaining reliable starting.
2Stability of the object's composition
If multiple sparking is performed to account for variable fuel atomization timing, then the stability of combustion is improved, but the electric power consumption increases
Solution Approach 1:
The patent implements feedback by detecting engine conditions (rotation speed, temperature, starting history) and using this information to adjust the number of sparking times and interval periods. This feedback mechanism ensures that sparking operations are optimized based on actual combustion conditions, maintaining stable combustion while avoiding excessive sparking that would increase electric power consumption.
Solution Approach 2:
The system dynamically adjusts sparking parameters based on real-time engine conditions. By making the number of sparking times and interval periods variable according to detected conditions, the system maintains stable combustion across varying operating conditions without requiring a fixed high number of sparking operations, thus reducing electric power consumption.
3Device complexity
If a constant number of sparking times is used for all starting conditions, then the control simplicity is maintained, but the adaptability to different starting conditions deteriorates
Solution Approach 1:
The patent makes the control system dynamic by adjusting the number of sparking times and interval periods based on detected engine conditions such as rotation speed, temperature, and starting history. This dynamic adaptation allows the system to handle various starting conditions effectively while the control device maintains overall simplicity through automated condition-based adjustment.
Solution Approach 2:
The system changes sparking parameters (number of times, interval periods) based on detected engine conditions. This parameter adaptation enables the control device to respond to different starting conditions (cold start, warm start, high rotation, low rotation) appropriately, improving versatility while the control logic remains systematic and manageable.
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
The solution reduces electric power consumption during engine startups by optimizing sparking frequency and using assistive torque from an electric motor, ensuring reliable ignition and improved fuel efficiency.
Implementation Method 1
an ignition determining portion detecting an ignition in a predetermined cylinder based on an ion current generated when combustion is caused in the predetermined cylinder
Implementation Method 2
an electric motor coupled to the direct injection engine and raising the rotation of the direct injection engine at a start of the direct injection engine
Implementation Method 3
a time required for atomization or vaporization of fuel
Data Source
AI summary
A start control device of a vehicular direct injection engine provided in a vehicle is configured to execute an ignition start to raise rotation of the direct injection engine at a start of the direct injection engine by fuel injection and multiple sparking performed for a predetermined cylinder in an expansion stroke out of multiple cylinders of the direct injection engine, the start control device of a vehicular direct injection engine reduces the number of times of sparking for the predetermined cylinder at the time of an ignition start of the direct injection engine as compared to an ignition start performed before the current ignition start based on ignition timing of the ignition start performed before the current ignition start.