HOOD GP 2232344 - Caterpillar

Table 10
Core Parameters    
Parameters     Enabled     Disabled/Enabled    
Software Units     Metric     English/Metric    
Choke     Yes     Yes/No    
Landfill Module     No     Yes/No    
Electric Starters     No     Yes/No    
Actuators     90 Degrees     90 Degrees, 42 Degrees, Cat Hydrax    Note: These values are for reference only. These values will vary depending on the application specific information, such as the separate circuit water temperature. Refer to the Personality Module drawing for the application specific alarm and shutdown levels.Air/Fuel Ratio Control
The G3600 Engine does not have a carburetor. The air flow and the fuel flow are independently controlled. The governor has complete control of the fuel flow. This leaves the air flow as the only parameter for adjusting the air/fuel ratio. The air flow is controlled by the exhaust wastegate system in order to maintain the desired air/fuel ratio or the desired combustion burn time (BT). Fuel Flow
The ECM will calculate the fuel flow by using the following inputs:
measured fuel manifold pressure
measured fuel manifold temperature
measured air inlet manifold pressure
measured air inlet manifold temperature
engine speed
BTU settingAir Flow
The ECM calculates the air flow based on the measured inlet manifold air pressure, the measured inlet manifold temperature, and the engine speed.Desired Air/Fuel Ratio
The desired air/fuel ratio varies depending on engine speed and load. These values are stored in application specific maps in the Personality Module. These maps were created to achieve optimum engine performance (efficiency and emissions) as the engine speed and load varies.
Illustration 16 g00314965
Example Air/Fuel RatioEngine Control MapCombustion Burn Time (BT)
Combustion Burn Time is the time measured for combustion flame propagation from the ignition spark in the precombustion chamber to the combustion sensing probe. The probe is mounted in the main combustion chamber.
Illustration 17 g00314967
Cylinder Ignition And Sensor (1) Combustion sensor. (2) Precombustion chamber. (3) Gas ignition spark plug.In-cylinder combustion sensing for each cylinder, allows the engine to respond rapidly to changes in ambient conditions, fuel quality or speed and load changes. This results in a more precise control of the engine emissions and the fuel consumption. The combustion sensor is a nonconventional 14 mm (.55 inch) spark plug. The spark plug operates in conjunction with an electronic combustion buffer. This measures the actual time between the spark and the passage of the flame across the sensor. This information is averaged and compared with a desired map setting in the personality module. Corrections for variations in fuel quality, temperatures, etc. are made automatically as well as more quickly and accurately than manual adjustments.
Illustration 18 g00497861
Basic Combustion Probe SystemThe measured combustion burn time signals are sent to the ECM on two separate circuits. One circuit is dedicated to the Cylinder No. 1. Another circuit sends the signals for the remaining cylinders to the ECM. The signals are received by the ECM in the firing order sequence. Air Flow Control
Once the ECM has determined a desired air flow, the ECM modulates the exhaust bypass valve by changing the position of the wastegate actuator. When