Variable Displacement Hydraulic Pump Control for Stable Auxiliary Power
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Solution Overview
Problem
Existing systems for controlling auxiliary power sources in vehicles struggle to maintain precise frequency and voltage output, especially under varying engine speeds, leading to mechanical failures and increased warranty returns.
Innovation Solution
A control system featuring a variable displacement hydraulic pump and motor connected by a fluid circuit with a control circuit that maintains constant rotational speed, incorporating valves for fine flow control and a system controller for remote communication, enabling precise electrical output characteristics and extended system lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hydraulic valve system is used to control fluid flow to the hydraulic motor, then the system can operate with simpler components, but the frequency and voltage output become unstable under varying engine speeds
Solution Approach 1:
The patent replaces the mechanical hydraulic valve control system with an electronic control system. The electronic controller receives signals about engine speed and auxiliary power source speed, then electronically adjusts the hydraulic pump's displacement to maintain constant motor speed and stable electrical output, eliminating the instability inherent in mechanical valve systems.
Solution Approach 2:
The patent uses a variable displacement hydraulic pump to provide precise fluid flow control to the hydraulic motor. By varying the pump displacement electronically based on feedback signals, the system maintains constant motor speed despite engine speed variations, ensuring stable frequency and voltage output from the auxiliary power source.
2Adaptability or versatility
If the engine speed varies to meet different vehicle power demands, then the vehicle can operate efficiently under different conditions, but the auxiliary power source output frequency and voltage become unstable
Solution Approach 1:
The patent implements a dynamic control system where the electronic controller continuously monitors both engine speed and auxiliary power source speed, then dynamically adjusts the hydraulic pump displacement in real-time. This allows the system to adapt to varying engine speeds while maintaining constant auxiliary power source output, ensuring stable frequency and voltage despite changes in vehicle power demands.
Solution Approach 2:
The system uses feedback control where the electronic controller receives signals about the actual speeds of both the engine and auxiliary power source, compares them to desired values, and automatically adjusts the hydraulic pump displacement to eliminate any deviation. This feedback mechanism ensures stable electrical output even when engine speed varies to meet different vehicle power demands.
3Measurement precision
If a constant speed hydraulic motor is used to drive the auxiliary power source, then precise frequency and voltage output can be maintained, but the system becomes more complex and prone to mechanical failure
Solution Approach 1:
The patent replaces complex mechanical constant-speed control mechanisms with an electronic control system. The electronic controller manages the variable displacement hydraulic pump to maintain constant motor speed, achieving precise frequency and voltage output without the mechanical complexity and associated reliability issues of traditional mechanical constant-speed devices.
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 control system provides stable and precise electrical output, reduces mechanical failures, and lowers warranty costs by maintaining constant rotational speed and flow control, enhancing the reliability and longevity of auxiliary power sources.
Implementation Method 1
a variable displacement hydraulic pump drivably connectable to a primary power source, the pump having an inlet for receiving fluid, an outlet for discharging fluid under pressure
Implementation Method 2
a hydraulic motor having an inlet for receiving fluid under pressure and an outlet for discharging spent fluid, the motor being drivably connectable to an auxiliary power source
Data Source
AI summary
A control system includes a variable displacement hydraulic pump, the pump having an inlet for receiving fluid, an outlet for discharging fluid under pressure, and a pump displacement input, a hydraulic motor having an inlet and an outlet, a fluid circuit including a supply conduit for conducting fluid discharged by the pump to the motor and a return conduit for returning fluid discharged by the motor to the pump, a pump displacement control cooperating with the pump displacement input in order to vary a displacement of the pump, a control circuit in communication with the pump displacement control for controlling the pump output such that the motor is driven at a constant rotational speed, and a system controller in communication with the control circuit and a remote location to transmit and receive information to and from the remote location.