Vehicle Control System for Dynamic Engine Restart Threshold
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Solution Overview
Problem
In vehicles equipped with power steering devices that can travel with the engine stopped, there is a risk of overlapping power requests from the starting device and power steering device, leading to increased weight and capacity requirements for the electric storage device, necessitating a solution to secure power supply while reducing the storage device's capacity.
Innovation Solution
A vehicle controlling system that includes an engine, an electric storage device, a generator, a starting device, and a power steering device, where the engine is started based on vehicle speed, and the power supply capability is adjusted to ensure simultaneous operation of the starting and power steering devices, with the option of inertial running to conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large capacity electric storage device is used to supply power to both the starting device and power steering device simultaneously, then the power supply capability is improved, but the weight of the electric storage device increases
Solution Approach 1:
The patent dynamically adjusts the engine restart threshold speed based on vehicle speed and power consumption conditions. When vehicle speed is high and power consumption is low, the engine restart is delayed, allowing the electric storage device to be smaller. When vehicle speed is low or power consumption is high, the engine restarts earlier to ensure adequate power supply. This dynamic control enables use of a smaller electric storage device while maintaining sufficient power supply capability.
Solution Approach 2:
The patent changes the operational parameters of the engine restart control based on real-time conditions. The restart threshold speed is adjusted as a variable parameter rather than a fixed value, adapting to changes in vehicle speed, power consumption rate, and state of charge of the electric storage device. This parameter adjustment allows optimization of the balance between power supply capability and electric storage device capacity.
2Use of energy by moving object
If the engine is stopped to allow inertial running, then fuel efficiency is improved, but the power supply capability to the power steering device may be insufficient
Solution Approach 1:
The system dynamically determines whether to maintain engine stop condition or restart the engine based on real-time monitoring of vehicle speed, power consumption, and electric storage device state. During inertial running, if power consumption increases or vehicle speed drops below the restart threshold, the engine automatically restarts to ensure sufficient power supply to the power steering device, while otherwise maintaining the stopped state for fuel efficiency.
Solution Approach 2:
The patent implements a feedback control mechanism where the engine control unit continuously monitors vehicle operating conditions and adjusts engine operation accordingly. The restart decision is based on feedback from sensors measuring vehicle speed, power consumption rate, and battery state of charge, creating a closed-loop control system that balances fuel efficiency and power supply capability.
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 secures power supply to the power steering device while reducing the electric storage device's capacity, improving fuel efficiency and ensuring stable operation by optimizing power distribution and reducing the engine stop prohibition region based on the storage device's power capability.
Implementation Method 1
a generator that generates power by rotating in conjunction with a rotation of the engine
Implementation Method 2
a starting device that starts the engine by consuming power from the electric storage device
Data Source
AI summary
A vehicle controlling system starts an engine by a starting device based on a vehicle speed, and changes a predetermined vehicle speed, which is a vehicle speed when the engine is started, in response to a state of an electric storage device, when an execution of inertial running in which the engine is stopped to allow the vehicle to run with inertia. Power consumed by a power steering device is changed in response to a vehicle speed. The predetermined vehicle speed is a lower limit vehicle speed in a vehicle speed range in which the electric storage device can output power consumed by the starting device when the engine is started and power consumed by the power steering device at the same time, or a vehicle speed close to the lower limit vehicle speed in the vehicle speed range.