V-Type Engine Control for Reliable Start-Up
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Solution Overview
Problem
Internal combustion engines with independent A-side and B-side common rail systems face unreliable start-up due to potential failures in rail pressure sensors, leading to undefined closed-loop pressure control and delayed start-up processes.
Innovation Solution
A method is implemented where the set torque is limited to a starting torque during engine start-up, blocking injection until both rail pressures exceed a predetermined threshold, and enabling injection only when verified engine speed and correct sensor readings are present, ensuring rapid and reliable pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the speed controller computes high set torque during start-up to overcome large speed control deviation, then the engine can start faster, but injection nozzles remain closed due to insufficient rail pressure causing delayed start-up process
Solution Approach 1:
The control system performs preliminary actions by blocking injection until rail pressure reaches the opening pressure threshold. This prevents fuel from being taken by injectors during the pressure buildup phase, ensuring that pressure increases rapidly without being depleted by premature injection attempts. The system prepares the rail pressure to the required level before enabling injection, thereby resolving the contradiction between needing high torque for fast start-up and requiring sufficient rail pressure for nozzle opening.
2Stability of the object's composition
If closed-loop rail pressure control is implemented with independent A-side and B-side systems, then pressure fluctuations are reduced, but sensor failure leads to undefined control state and unreliable start-up
Solution Approach 1:
The control system continuously monitors rail pressure through feedback from sensors and adjusts the set torque accordingly. During start-up, the system feedback-checks whether rail pressure has reached the opening pressure threshold before enabling injection. This feedback mechanism ensures that even if one sensor fails, the system can detect the pressure state and make appropriate control decisions, preventing undefined control states and ensuring reliable start-up while maintaining pressure stability.
3Power
If injection is electrically initiated during start-up with large speed control deviation, then high set torque is computed, but fuel is taken by injectors causing delayed pressure buildup
Solution Approach 1:
The control system applies preliminary anti-action by blocking the injection function until rail pressure reaches the required threshold. This prevents the harmful effect of fuel being taken by injectors during the pressure buildup phase. The system actively prevents injection activation when pressure is insufficient, thereby protecting the pressure buildup process from being depleted and ensuring rapid pressure increase to the opening pressure level, resolving the contradiction between high power output and pressure buildup.
Data Source
AI summary
Disclosed is a method for the control and regulation of a V-type internal combustion engine (1), comprising an independent common rail system on the A side and an independent common rail system on the B-side, in which the rotational speed of the internal combustion engine (1) is regulated in a speed control loop and a nominal torque as an adjusted variable of the rotational speed governor is limited during the starting procedure to a starting torque for representing a nominal injection null set.