Caterpillar Inc.

Caterpiller Inc.

Prasanna Mohan Ballal

Daniel Reese Puckett

Shawn M Damm

Kranti Kumar Nellutla

Michael E Sattler

Bryan Moore

Bradley Scott Bashore

Julia H Jenks

Oskar Turner

Joseph P Fuller

A method for detecting reverse flow for a dual fuel engine is disclosed. The engine may include an intake manifold, a liquid fuel supply line and a gaseous fuel supply line, the gaseous fuel supply line including a gaseous fuel supply and a gaseous fuel rail. The method may include: operating the dual fuel engine in a liquid fuel only mode via the liquid fuel supply line; determining a reverse flow in the gaseous fuel supply line; and outputting an indication of reverse flow in response to the determination of reverse flow.

Reverse flow detection system

Systems and methods for reverse flow detection for a dual fuel engine are disclosed. The engine may include an intake manifold, a liquid fuel supply line and a gaseous fuel supply line, the gaseous fuel supply line including a gaseous fuel supply and a gaseous fuel rail. The method may include: receiving sensed values of gaseous fuel supply pressure, intake manifold pressure, and gaseous fuel rail pressure; determining a threshold value based on the sensed value of gaseous fuel supply pressure; determining a reverse flow in the gaseous fuel supply line based on the sensed values of gaseous fuel supply pressure and gas rail pressure and the determined threshold value; and outputting an indication of reverse flow in response to the determination of reverse flow.

Systems and methods for reverse flow detect

Fuel is injected by energizing a solenoid of a fuel injector for an on-time that terminates at a first end-of-current timing. An end-of-current trim is determined at least in part by estimating a duration between an induced current event in a circuit of the solenoid and a valve/armature interaction event. An induced current event occurs when an armature abruptly stops, and a valve/armature interaction event occurs when the armature couples with or de-couples from the valve member. Fuel is injected in a subsequent injection event by adjusting the end-of-current timing by the end-of-current trim.

End-of-current trim for common rail fuel system

End-of current trim for common rail fuel system

Growing community of inventors

Peoria, IL, United States of America

Prasanna Mohan Ballal