Integrated Electrical Pump Sensorless Pressure Control
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Solution Overview
Problem
In hybrid electric vehicles, the use of an Integrated Electrical Pump (IEP) requires a pressure sensor to maintain hydraulic pressure, which occupies space and increases costs.
Innovation Solution
An integrated electrical pump with a pressure control system that includes a motor, oil pump, and a pressure control module to control hydraulic pressure based on motor speed, oil temperature, and pressure command, allowing for the omission of a pressure sensor by using a position and speed calculation module, torque compensation module, and PI controller for closed-loop control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure sensor is installed in the integrated electrical pump to maintain hydraulic pressure, then the hydraulic pressure control reliability is improved, but the device occupies more space and increases cost
Solution Approach 1:
The patent extracts the pressure sensing function from a separate pressure sensor component and integrates it into the motor's existing position sensor. The position sensor normally detects rotor position for motor control, but its output signals are repurposed to also indicate hydraulic pressure conditions. This extraction principle eliminates the need for a separate pressure sensor, reducing device volume while maintaining pressure control reliability.
Solution Approach 2:
The patent makes the position sensor multi-functional by using it for both motor control (position detection) and hydraulic pressure monitoring. The same sensor hardware serves dual purposes: controlling motor operation and indicating when hydraulic pressure needs maintenance. This universality principle reduces the total number of components without compromising either motor control or pressure management functionality.
2Reliability
If a pressure sensor is installed in the integrated electrical pump to maintain hydraulic pressure, then the hydraulic pressure control reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent makes the position sensor multi-functional by using it for both motor control (position detection) and hydraulic pressure monitoring. The same sensor hardware serves dual purposes: controlling motor operation and indicating when hydraulic pressure needs maintenance. This universality principle reduces the total number of components without compromising either motor control or pressure management functionality.
Solution Approach 2:
The patent merges the pressure sensing function with the existing motor control system by utilizing the position sensor's output signals for both purposes. Instead of adding a separate pressure sensor, the system combines pressure monitoring capabilities into the already-present motor control electronics, reducing component count and manufacturing complexity.
3Device complexity
If traditional hydraulic pressure control methods are used, then the system structure is simple, but the control accuracy and response time are insufficient
Solution Approach 1:
The patent implements a feedback control mechanism where the position sensor continuously monitors rotor position and provides real-time information to the control system. This feedback enables the motor controller to adjust motor operation in response to changing hydraulic pressure conditions, achieving accurate pressure control without complex additional hardware. The feedback loop maintains pressure within desired ranges by dynamically adjusting motor-driven pump operation.
Solution Approach 2:
The system uses its own existing position sensing infrastructure to provide pressure control functionality without requiring external sensing equipment. The motor control system serves dual purposes: controlling motor operation and monitoring hydraulic pressure conditions. This self-service approach maintains simple system structure while achieving improved control accuracy through intelligent use of existing components.
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 accurate control of hydraulic pressure without a pressure sensor, saving space and reducing costs while improving control accuracy and response time.
Implementation Method 1
an oil pump driven by the motor
Implementation Method 2
a pressure control system controls a hydraulic pressure of the oil pump according to a motor speed of the motor
Data Source
AI summary
An integrated electrical pump comprises a motor, an oil pump driven by the motor, and a pressure control system. The pressure control system controls a hydraulic pressure of the oil pump according to a motor speed of the motor, an oil temperature and a pressure command. An oil pressure control method of the integrated electrical pump is also provided.