Steering Device Secondary Pump Hydraulic Supply Control
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Solution Overview
Problem
Conventional steering devices face difficulties in applying sufficient steering assist force when the hydraulic fluid supply to the power cylinder is deficient, particularly during idling stop or hydraulic system malfunctions.
Innovation Solution
A secondary pump driven by a second electric motor is introduced to supplement hydraulic fluid supply when the primary pump's hydraulic pressure is insufficient, ensuring continuous steering assist force by increasing the rotation number of the second motor in such conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pump driven by an engine is used to supply hydraulic fluid to the power cylinder, then the steering device can be kept simple in structure, but the supply of hydraulic fluid becomes deficient at idling stop or during hydraulic system malfunction
Solution Approach 1:
The hydraulic pump system is segmented into two independent pumps: a first pump driven by the engine and a second pump driven by a second electric motor. This segmentation allows each pump to operate independently, ensuring that hydraulic fluid supply can be maintained even when the engine-driven pump is unavailable during idling stop or malfunction conditions.
Solution Approach 2:
The control device changes the operating parameters of the second pump by increasing the rotation number of the second electric motor when hydraulic fluid supply from the first pump becomes deficient. This parameter adjustment ensures sufficient hydraulic pressure is maintained in the power cylinder during critical operating conditions.
2Reliability
If the rotation number of the second motor is increased to supplement hydraulic fluid supply, then steering assist force can be maintained, but energy consumption increases
Solution Approach 1:
The rotation number of the second electric motor is dynamically adjusted based on real-time detection of hydraulic fluid supply conditions. The control device increases the rotation number only when the first pump's supply is deficient, and maintains normal operation when supply is sufficient, thereby optimizing energy consumption while ensuring steering assist reliability.
Solution Approach 2:
The control device implements a feedback mechanism that monitors the hydraulic fluid supply status from the first pump and automatically adjusts the second pump's operation accordingly. This feedback-controlled approach ensures the second motor operates at increased rotation number only when necessary, minimizing unnecessary energy consumption while maintaining steering assist force reliability.
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 enables the provision of steering assist force to the second shaft even when the hydraulic fluid supply is deficient, thereby maintaining steering performance and preventing decreases in steering device efficiency.
Implementation Method 1
A steering assist force is applied to the second shaft based on a hydraulic pressure supplied to a power cylinder by using a pump driven by an engine
Data Source
AI summary
A steering device includes: a steering mechanism including a steering shaft, and a transmitting mechanism; and a controller including a first hydraulic passage state judging section, a first electric motor control section, and a second electric motor control section; the first hydraulic passage state judging section configured to judge a state of the hydraulic fluid in a first hydraulic passage in which the hydraulic fluid discharged from the first pump flows, the first electric motor control section configured to control and drive the first electric motor based on a driving state of a vehicle, and the second electric motor control section configured to increase a rotation number of the second electric motor when the first hydraulic passage state judging section judges that a supply of the hydraulic fluid in the first hydraulic passage is deficient.