Hybrid Vehicle Drive Controller Speed Regulation
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Solution Overview
Problem
Hybrid vehicles face challenges in mounting a sufficient battery to handle charging currents on two-wheeled vehicles due to limited space, leading to potential overheating and reduced battery life from excessive charging currents.
Innovation Solution
A drive controller that regulates the generator's speed and throttle opening to keep the rotational speed above 80% of the upper limit, reducing the charging current to the battery and preventing overcharging, thereby allowing effective battery charging without increasing battery volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sufficient battery is mounted to handle charging currents during low-speed high-load running, then the battery can accept excessive charging current, but the vehicle body space required increases which is not available in two-wheeled vehicles
Solution Approach 1:
The invention changes the operational parameters of the generator by controlling its rotational speed to remain above 80% of the upper limit. This parameter change allows the generator to produce sufficient power while limiting the charging current to safe levels, eliminating the need for an oversized battery
Solution Approach 2:
The control section continuously monitors the generator's rotational speed and adjusts control signals accordingly to maintain speed above 80% of the upper limit. This feedback mechanism ensures the charging current remains within safe boundaries while maximizing power generation efficiency
2Power
If the generator produces sufficient power during low-speed high-load running, then the charging current becomes excessive, but this causes battery overheating and reduced battery life
Solution Approach 1:
By maintaining generator rotational speed above 80% of the upper limit, the invention optimizes the generator's operating parameters to produce sufficient power while naturally limiting the charging current to prevent battery overheating
Solution Approach 2:
The invention converts the potential harmful effect of excessive charging current into a beneficial control mechanism. By using the generator's speed control to limit charging current, the system transforms what would be a dangerous condition into a means of protecting the battery
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 prevents overcurrent supply to the battery, extends battery life, and reduces the required battery volume, enabling hybrid drive unit control on two-wheeled vehicles with limited space while maintaining efficient energy management.
Implementation Method 1
a generator (270) driven by the engine (210) for generating electric power
Implementation Method 2
a battery (400) charged by the generator (270)
Data Source
AI summary
A hybrid vehicle includes an engine for generating power through fuel consumption, a generator driven at least by the engine for generating power, a battery charged by the generator, a motor driven by at least the electric power from the generator or the battery to generate power, and a drive wheel that is rotated by the power of at least one of the engine and the motor. The hybrid vehicle also includes a drive controller with a control section configured to regulate the speed of the generator driven by the engine, and configured to charge the battery with the power generated by the generator. The drive controller also comprises a battery current detector that produces a signal indicative of an amount of current supplied from the generator to the battery, the control section receiving said signal. The control section is configured to cause a throttle opening of the engine to decrease while controlling the generator to keep a rotational speed of the generator above about 80% of an upper rotational speed limit. In this manner, the drive controller inhibits the current supplied from the generator to the battery from exceeding a permissible charging current value set for the battery during the charging of the battery.