Electric Pump Control for Abnormal Sensor Conditions
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Solution Overview
Problem
Existing electric pump control systems face difficulties in maintaining required pump performance when oil temperature sensors and pump characteristics are abnormal, struggling to balance responsiveness and power consumption.
Innovation Solution
An apparatus and method that include a reference pump characteristic setting unit, an indicated current setting unit, and a control unit to adjust motor current and rotation number, ensuring pump performance is maintained by setting a target rotation number and adjusting motor current within specific ranges to maintain required performance while optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor current is increased to secure pump performance, then pump performance is improved, but power consumption increases
Solution Approach 1:
The control unit dynamically adjusts motor current based on the relationship between current and rotation number, selecting operating points that maintain pump performance while minimizing power consumption. The system continuously monitors pump performance and adjusts current accordingly, rather than using a fixed high current setting.
Solution Approach 2:
The system changes operating parameters (current and rotation number) based on the pump characteristic and operating conditions. By utilizing the reference pump characteristic that defines the relationship between current and rotation number, the system selects optimal parameter combinations that balance performance and energy efficiency.
2Speed
If motor rotation number is increased to improve responsiveness, then responsiveness is improved, but power consumption increases
Solution Approach 1:
The control unit dynamically adjusts motor rotation number based on the pump characteristic curve, selecting the minimum rotation number required to achieve the desired pump performance. This dynamic adjustment ensures responsiveness while avoiding excessive speed and energy consumption.
Solution Approach 2:
The system utilizes the reference pump characteristic to determine the optimal rotation number parameter for each operating condition. By changing rotation number according to the characteristic curve rather than maintaining a fixed high speed, the system achieves responsiveness with minimized energy consumption.
3Measurement precision
If oil temperature sensor or pump characteristic is abnormal, then detection accuracy deteriorates, but pump performance control is compromised
Solution Approach 1:
The control unit continuously monitors pump performance and adjusts motor current and rotation number based on feedback from the pump characteristic. When temperature sensor readings are abnormal, the system uses the reference pump characteristic as a feedback mechanism to maintain accurate performance control, compensating for sensor inaccuracies.
Solution Approach 2:
The system prepares a reference pump characteristic that defines the relationship between current and rotation number for various operating conditions. This reference serves as a pre-prepared compensation mechanism that cushions against detection errors, allowing the system to maintain accurate control even when temperature sensors provide abnormal readings.
Data Source
AI summary
In an apparatus for controlling an electric pump supplying operating oil to a driving system or the like of a vehicle, control satisfying both responsiveness and reduction in power consumption is performed even in a case in which an oil temperature sensor and a pump characteristic are abnormal. After starting of the electric pump, feedback control is performed in which a rotation number Nm of a driving motor is settled in a target rotation number Na set to satisfy predetermined performance. After satisfying a predetermined condition in which the motor rotation number Nm is in a stable state, motor current Im is settled in an indicated current Ip within a range of being equal to or less than a current limit value IL while the motor rotation number Nm is maintained equal to or greater than a required rotation number Np corresponding to the indicated current Ip.