PWM Pump Control Signal for Urea Injection Pressure Management
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Solution Overview
Problem
Existing systems for controlling heavy goods vehicle urea pumps used for NOx emission reduction lack simplicity in controlling the pump's operation, including direction and diagnosis, and do not effectively manage outlet pressure, leading to potential issues like blockages and leaks.
Innovation Solution
A method and system using a Pulse Width Modulation (PWM) control signal from an Electronic Control Module (ECM) to manage the electric motor driving the pump, allowing for simultaneous control of pump operation, including rotation direction and pressure, with integrated diagnostic capabilities to detect anomalies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PWM control signal is used to control pump operation, then control simplicity and connection reduction are improved, but the ability to independently control speed, direction, and pressure is worsened
Solution Approach 1:
The PWM control signal is designed to perform multiple functions simultaneously: it controls motor speed through duty cycle modulation, determines rotation direction through frequency coding, and enables diagnostic communication. This multi-functional approach allows a single signal to replace what would traditionally require separate control lines for speed, direction, and diagnostics.
Solution Approach 2:
The control system utilizes different parameters of the PWM signal (duty cycle, frequency, pulse width) to encode multiple control commands. By varying these parameters, the system can distinguish between different operating modes (forward, reverse, stopping) and transmit diagnostic information without requiring additional physical connections.
2Ease of operation
If traditional multi-signal control systems are used, then independent control of speed and direction is improved, but the number of connections and control complexity is worsened
Solution Approach 1:
The PWM signal serves as a universal control medium that handles speed regulation, direction control, and diagnostic communication through a single connection. The controller interprets different aspects of the PWM signal (duty cycle for speed, frequency for direction) to achieve independent control of multiple pump parameters without requiring multiple separate control lines.
3Device complexity
If outlet pressure is not controlled, then pump operation simplicity is improved, but the risk of blockages and leaks is worsened
Solution Approach 1:
The system incorporates a pressure sensor that continuously monitors the outlet pressure of the pump. This pressure information is fed back to the controller, which compares the actual pressure against a reference value and adjusts the PWM duty cycle to maintain proper pressure levels. This feedback mechanism prevents both blockages (by detecting excessive pressure) and leaks (by ensuring sufficient pressure).
Solution Approach 2:
The control system automatically regulates pump outlet pressure through the PWM control signal without requiring manual intervention. The controller continuously monitors pressure conditions and self-adjusts the pump operation to maintain optimal pressure, thereby preventing blockages and leaks autonomously.
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
Enables efficient and reliable operation of urea pumps by simplifying control through a single signal connection, ensuring accurate pressure management and real-time anomaly detection, thereby preventing issues like blockages and leaks.
Implementation Method 1
A method and system using a Pulse Width Modulation (PWM) control signal from an Electronic Control Module (ECM) to manage the electric motor driving the pump
Data Source
AI summary
Method for controlling the operation of a pump driven by an electric motor and controlled by a controller, according to which an electronic control module (ECM) sends, to the controller, a PWM (Pulse Width Modulation) control signal having a duty cycle that varies as a function of the desired operating conditions for the pump and according to which the controller acts on the electric motor to apply said operating conditions to the pump.