Hybrid Engine Start Control for Sporty Acoustic Effect
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Solution Overview
Problem
Existing hybrid vehicle systems struggle to provide a consistent and sporty acoustic effect during internal-combustion engine starting, as the rotation speed overshoot is not adequately described, leading to discomfort for the driver due to varying engine states.
Innovation Solution
An internal-combustion engine starting device that includes a control unit to set a second rotation speed based on coolant temperature, allowing for a higher rotation speed difference between starting modes, enhancing the sporty sound effect and ensuring driver satisfaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed rotation speed overshoot of 200 to 500 rpm is used for starting the internal-combustion engine, then the starting control is simple, but the acoustic effect becomes unpleasant and causes driver discomfort due to varying engine states
Solution Approach 1:
The patent applies dynamics by making the target rotation speed variable rather than fixed. The control unit dynamically adjusts the target rotation speed based on real-time coolant temperature data from the water temperature sensor. This allows the rotation speed overshoot to adapt to varying engine states, ensuring a consistent sporty acoustic effect while eliminating driver discomfort.
Solution Approach 2:
The patent changes the parameter of target rotation speed based on coolant temperature conditions. When coolant temperature is below the third threshold value, the target rotation speed is set to a higher value to produce a sporty acoustic effect. When the temperature is above the threshold, a lower target rotation speed is used. This parameter change resolves the contradiction by maintaining acoustic quality across different operating conditions.
2Object-affected harmful factors
If the target rotation speed is increased to achieve a sporty acoustic effect, then the acoustic effect improves, but the risk of control failure increases
Solution Approach 1:
The patent uses parameter changes based on coolant temperature to balance acoustic effect and reliability. By setting the target rotation speed to a higher value only when coolant temperature is below the third threshold value, the system achieves a sporty acoustic effect while avoiding control failure. The temperature-based condition ensures the engine is in an appropriate state to handle the higher rotation speed.
Solution Approach 2:
The patent implements feedback by continuously monitoring coolant temperature through the water temperature sensor and using this information to adjust the target rotation speed. This closed-loop control ensures that the target rotation speed is appropriately set based on real-time engine conditions, preventing control failure while maintaining acoustic quality.
3Object-affected harmful factors
If a high rotation speed difference of 1,500 to 2,000 rpm is set, then the sporty acoustic effect is enhanced, but the control complexity increases
Solution Approach 1:
The patent manages control complexity by using a simple temperature threshold-based parameter change strategy. The control unit compares coolant temperature against a predetermined third threshold value and adjusts the target rotation speed accordingly. This straightforward approach enables a high rotation speed difference of 1,500 to 2,000 rpm to achieve a sporty acoustic effect without excessive control complexity.
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 system effectively sets a high rotation speed difference of up to 1,500 to 2,000 rpm, providing a consistent sporty acoustic effect and enhancing the driving experience by aligning the sound with the vehicle's operation characteristics.
Implementation Method 1
the control unit controls the motor to increase a rotation speed of the internal-combustion engine to a target rotation speed
Implementation Method 2
a cooling unit cooling the internal-combustion engine by a coolant
Implementation Method 3
a temperature acquiring unit acquiring a temperature of the coolant
Implementation Method 4
a rotation speed acquiring unit acquiring a rotation speed of the internal-combustion engine
Data Source
AI summary
Provided is an internal-combustion engine starting device in which a control unit controls a motor to realize a first starting mode of starting an internal-combustion engine by increasing a rotation speed of the internal-combustion engine to a predetermined first rotation speed NE1 by the motor and a second starting mode of starting the internal-combustion engine by increasing the rotation speed of the internal-combustion engine to a second rotation speed NE2 set higher than the first rotation speed NE1 and set based on a temperature of a coolant by the motor.