Diesel Engine High-Pressure Pump Torque Control for Capacity Limits
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Solution Overview
Problem
Diesel engine high-pressure pumps are often temporarily beyond capacity, leading to faulty diagnosis and unnecessary replacement, as they are not designed to handle additional fuel demands such as particulate filter regeneration, resulting in permanent engine torque limitation solutions that are not satisfactory.
Innovation Solution
A method for controlling engine torque in diesel engines that involves monitoring the pump's capacity through volume and pressure commands, detecting temporary beyond-capacity states, and limiting torque to prevent faulty diagnosis, allowing other fuel-dependent functions to continue while gradually restoring normal torque operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pump is dimensioned to meet specific torque specifications, then the pump can deliver a determined volume of compressed fuel for torque generation, but the pump cannot handle additional fuel demands for functions like particulate filter regeneration, leading to faulty diagnosis when temporarily beyond capacity
Solution Approach 1:
The system dynamically monitors pump operation parameters (pressure, volume, speed) in real-time and adjusts the torque limitation strategy based on the actual beyond-capacity condition. The control unit continuously evaluates whether the pump is in a faulty state or temporarily beyond capacity by comparing measured parameters against expected values, and dynamically modifies engine torque commands accordingly.
Solution Approach 2:
The system implements feedback control by continuously monitoring pump pressure, volume delivered, and speed, then using this information to diagnose pump state and adjust torque commands. The control unit receives feedback from sensors measuring pump output and compares it against the commanded injection parameters to determine whether the pump is faulty or temporarily overloaded.
2Reliability
If the engine torque is permanently limited to prevent pump beyond-capacity states, then the pump never ends up beyond capacity, but the engine torque is permanently limited which is not satisfactory for temporary additional fuel demands
Solution Approach 1:
The system transitions from static torque limitation to dynamic torque management. Instead of permanently reducing torque, the control unit dynamically adjusts torque commands based on real-time pump status. When the pump is detected to be in a beyond-capacity state, torque is temporarily limited; when the pump recovers, normal torque operation is restored.
Solution Approach 2:
The system implements periodic monitoring and adjustment of torque based on combustion cycle timing. The control unit evaluates pump capacity at specific intervals during the combustion cycle and adjusts torque commands accordingly, allowing temporary torque limitation during beyond-capacity periods while maintaining normal operation during capacity-sufficient periods.
3Reliability
If the quantity of fuel to be injected is fixed at a maximum value to ensure pump capacity compliance, then the pump is never beyond capacity, but the engine torque is permanently limited
Solution Approach 1:
The system replaces fixed maximum fuel quantity with dynamic fuel injection control. The control unit continuously adjusts the commanded fuel volume based on real-time pump performance monitoring, allowing the system to operate at optimal fuel quantities for torque generation while preventing pump beyond-capacity states through active management rather than fixed limitations.
Data Source
AI summary
Disclosed is a method for controlling an engine torque for a diesel engine, characterized in that the engine torque control is implemented in an injection system. The injection system in question includes a high-pressure pump controlled by an engine control unit, the high-pressure pump supplying a fuel supply rail, the pump being dimensioned to be capable of delivering a capacity volume of compressible fuel for each combustion cycle of the diesel engine. It also includes a pressure sensor for measuring the pressure of the fuel in the fuel rail.