Two-System Motor Brake Actuator with Capacitor Power
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Solution Overview
Problem
Vehicle brake systems without accumulators face challenges in achieving high responsiveness during sudden braking, as they rely on pumps driven by electric motors that require high power, leading to potential battery instability and adverse effects on other devices.
Innovation Solution
A vehicle brake system with a two-system motor electric motor, utilizing both a battery and a capacitor as power sources, where the capacitor assists in providing high power during sudden braking, restricting battery power usage to prevent instability and ensuring quick hydraulic braking force response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pump is driven by high power from the battery during sudden braking, then the hydraulic braking force response is improved, but the battery stability deteriorates and other devices are adversely affected
Solution Approach 1:
The power supply system is segmented into two independent power sources: battery and capacitor. The capacitor specifically supplies high power during sudden braking, while the battery provides stable baseline power, preventing the battery from being overloaded and maintaining its stability.
Solution Approach 2:
The capacitor acts as an intermediary power source between the battery and the pump motor. During sudden braking, the capacitor mediates by providing the additional high power needed, protecting the battery from direct high-power demands that would cause instability.
2Productivity
If the pump is driven by high power during sudden braking, then the responsiveness is improved, but the adverse effects on other devices increase
Solution Approach 1:
The electrical load is segmented between two power sources. The capacitor handles the high-power transient demand during braking, isolating other devices from the harmful effects of high current draw that would otherwise be drawn from the shared battery power source.
3Speed
If an accumulator is added to store high-pressure working fluid, then the responsiveness is improved, but the device complexity and cost increase
Solution Approach 1:
The mechanical hydraulic accumulator is replaced by an electrical capacitor-based power supply system. Instead of mechanically storing high-pressure fluid, the system electrically stores energy in the capacitor and converts it to mechanical power when needed, simplifying the overall system structure while achieving the same responsiveness goal.
Solution Approach 2:
The system changes the energy storage parameter from hydraulic pressure (mechanical) to electrical charge (electrical). This parameter change allows the use of a capacitor instead of an accumulator, reducing system complexity while maintaining the ability to deliver high power on demand.
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 configuration enables a vehicle brake system with enhanced responsiveness and stability, reducing the risk of battery instability and adverse effects on other devices, while maintaining cost-effectiveness by omitting the need for an accumulator.
Implementation Method 1
a capacitor (154)
Data Source
AI summary
A vehicle brake system including a hydraulic brake device that includes: a brake actuator including a pump and a two-system electric motor that includes first and second coils; a battery; a first drive circuit for supplying electric power from the battery to the first coil; a capacitor; and a second drive circuit for supplying electric power from the capacitor to the second coil, wherein, in a normal mode in which the pump is driven by power not greater than set power, the motor drives the pump by the electric power supplied from the battery to the first coil, and wherein, in a high power mode in which the pump is driven by power that exceeds the set power, the motor drives the pump by both of the electric power supplied from the battery to the first coil and the electric power supplied from the capacitor to the second coil.