Cooperative Power Steering Pump and Motor Control
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Solution Overview
Problem
Existing power steering devices lack cooperative control between the pump device and the electric motor on the input shaft, leading to inefficient steering assistance.
Innovation Solution
A power steering device is configured to control the driving of the electric motor on the input shaft based on the output of the electric motor controlling the pump device, enabling coordinated control between the two systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If independent control of pump device and electric motor is used, then control simplicity is maintained, but steering assistance efficiency deteriorates
Solution Approach 1:
The patent merges the control of the pump device and the electric motor into a unified cooperative control system. The control unit coordinates both actuators based on steering requirements, combining their effects to provide enhanced steering assistance while optimizing energy consumption. This resolves the contradiction by integrating control functions to improve efficiency without excessive complexity increase.
Solution Approach 2:
The control system is designed to perform multiple functions: it controls the pump device for hydraulic assistance, controls the electric motor for direct torque assistance, and coordinates both for cooperative operation. This multi-functional control approach allows the system to adapt to different steering conditions and optimize performance across various operating scenarios.
2Reliability
If cooperative control between pump device and electric motor is implemented, then steering assistance is improved, but control complexity increases
Solution Approach 1:
The cooperative control system incorporates feedback mechanisms where the control unit continuously monitors steering state, pump device output, and electric motor performance. Based on this feedback, the control unit dynamically adjusts the operation of both actuators to maintain optimal steering assistance while managing control complexity through adaptive coordination.
3Force
If both pump device and electric motor operate simultaneously, then steering torque is enhanced, but energy consumption increases
Solution Approach 1:
The control system dynamically adjusts the operation of the pump device and electric motor based on real-time steering requirements. During normal steering, only one actuator operates; during high-torque requirements, both operate cooperatively. This dynamic coordination enhances steering torque when needed while minimizing energy consumption during routine 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
This configuration enhances the cooperation between the pump device and the electric motor, resulting in improved steering assistance and energy efficiency by optimizing the hydraulic pressure and torque distribution within the power cylinder.
Implementation Method 1
a pump device (61), which pressurizes working fluid and supplies the working fluid to the power cylinder (7)
Implementation Method 2
an electric motor (5) on an input shaft (21), which is rotated by a steering operation on a steering wheel (200)
Data Source
AI summary
Provided is a power steering device capable of causing control that uses a pump device and control that uses an electric motor on an input shaft to cooperate with each other. The power steering device includes a power cylinder including a pair of hydraulic chambers partitioned by a piston and configured to generate a steering assist force for a steered wheel, a pump device configured to be driven through control by a first electric motor and configured to discharge working fluid, a rotary valve configured to selectively supply the working fluid supplied from the pump device to the pair of hydraulic chambers in accordance with relative rotation between the input shaft and the output shaft, a second electric motor provided so as to surround at least a part in an axial direction of the input shaft and configured to control the rotation of the input shaft, and a second electric motor control part installed in a control device and configured to output a control signal for controlling driving of the second electric motor based on a revolution number signal of the first electric motor.