Idle Stop Charge Control for Battery Recovery and Drivability
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Solution Overview
Problem
Conventional idle stop control systems compromise drivability and fuel efficiency due to increased engine load and lack of driver notification during battery charge reinforcement, and fail to maintain optimal throttle valve control during engine restarts.
Innovation Solution
Implementing a system with charge control means that executes advance/obtuse angle control and charging reinforcing control to increase dynamo power generation, while providing driver warnings and throttle valve driving suppressing control to maintain optimal engine output and battery charge, with output increasing control to enhance drivability and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If charging reinforcing control is executed to increase power generation amount, then battery charge amount is restored, but engine load increases and output transmitted to driving wheels is lowered
Solution Approach 1:
The patent dynamically adjusts the obtuse angle based on driver's throttle operation. When the driver operates the throttle, the system reduces or cancels the obtuse angle to prioritize engine output and drivability. When throttle operation is minimal, the system applies full obtuse angle control to maximize power generation. This dynamic adjustment resolves the contradiction by making the power generation enhancement adaptive to real-time driving conditions.
Solution Approach 2:
The system changes the phase angle parameter of the dynamo control based on driving conditions. By varying the obtuse angle degree according to throttle operation amount, the system optimizes the balance between power generation and engine output. This parameter change allows the same dynamo control system to serve dual purposes: maximizing charge when needed and minimizing load when driver demand is high.
2Loss of energy
If obtuse angle control is applied to increase power generation, then battery charging is enhanced, but drivability is deteriorated due to reduced acceleration feeling
Solution Approach 1:
The system dynamically responds to driver input by adjusting the obtuse angle in real-time. When the driver operates the throttle indicating a desire for acceleration, the system reduces the obtuse angle to restore engine power and acceleration feeling. This dynamic adaptation ensures that drivability is maintained when the driver needs vehicle performance, while still allowing power generation enhancement during gentle driving conditions.
Solution Approach 2:
The system uses throttle operation amount as feedback to adjust the obtuse angle control. By continuously monitoring driver input and adjusting the power generation control accordingly, the system creates a closed-loop control that prioritizes drivability when the driver indicates acceleration demand, while enabling enhanced charging during low-demand periods.
3Use of energy by moving object
If engine is stopped by idle stop control, then fuel consumption is reduced, but battery charge amount decreases
Solution Approach 1:
The system prepares for engine restart by controlling the dynamo to charge the battery before the engine is stopped by idle stop control. By executing advance charging when the engine is still running, the system ensures sufficient battery charge is available for the next restart, thereby enabling more frequent idle stop operations without compromising restart reliability.
Solution Approach 2:
The system maintains continuous useful action by coordinating idle stop control with dynamo charging cycles. During periods when the engine is running, the dynamo charges the battery continuously or periodically, ensuring that the battery is ready for the next idle stop event. This continuous preparation maintains the sustainability of idle stop control operations.
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 ensures excellent drivability and fuel efficiency by increasing engine output and power generation while notifying the driver of battery charge status, and optimizing throttle valve control during engine restarts, thus maintaining optimal engine performance and reducing fuel consumption.
Implementation Method 1
a dynamo (18) for generating electricity by a rotation driving force of an engine (14)
Data Source
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AI summary
The idle stop control device includes charge control means (46) for increasing and reducing a power generation amount of an ACG starter (18) in accordance with a charge state of a battery (19), and engine output control means (47) for controlling output of the engine (14a). When it is determined that stopping the engine by idle stop control is not suitable based on a charge state detected by charge state detecting means (41), the idle stop control device increases the power generation amount of the ACG starter (18) by the charge control means (46). When charging reinforcing control for increasing the power generation amount of the dynamo is executed by the charge control means (46), in response to this, the engine output control means (47) executes output increasing control for increasing, more than usual, the output of the engine (14a) with respect to the operation amount of the throttle grip (5).