TURBOCHARGER SYSTEM
10 STRUCTURE AND FUNCTION
FUNCTION OF KDOC
A: Flow of exhaust gas 1: Oxidation catalyst •
KDOC is installed in order to conform to the severe regulations of exhaust gas. KDOC has a function of oxidization of SOF (soluble organic fraction in particles of exhaust gas) , HC (unburnt combustible content), and CO (carbon monoxide) to clean the exhaust gas.
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Function of oxidation catalyst (1) Oxidizes SOF (soluble organic fraction in particles of exhaust gas) (2) Oxidizes HC (unburnt combustible content) (3) Oxidizes CO (carbon monoxide)
TYPES OF REGENERATION FUNCTIONS The regeneration function is a function for the urea SCR system to be maintained normally.
Active regeneration (engine exhaust temperature rise control + fuel dosing) •
Automatic regeneration •
The automatic regeneration is a function that starts the regeneration automatically upon receiving a request from the urea SCR system in order to maintain the urea SCR system normally by the fuel dosing (*2) when the engine controller enters the exhaust temperature rise control (*1) . The automatic regeneration is also performed by the command from the engine controller at a set time after the previous regeneration. *1: This is a control to increase the exhaust temperature of the engine by controlling the fuel injection timing, variable flow turbocharger, and exhaust throttle valve. *2: This is a fuel injection performed to accelerate the regeneration by increasing the exhaust temperature.
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Manual stationary regeneration •
The exhaust temperature may not reach a certain level depending on the operating condition of the machine even if the automatic regeneration is performed upon receiving a request from the urea SCR system when the exhaust temperature does not reach a certain level or when the operator disables regeneration. This is a regeneration function that is performed upon receiving a request for the manual stationary regeneration displayed on the machine monitor. This is a regeneration function performed by the operator on the machine monitor screen. There is also another regeneration function that is performed by a technician with operation on the machine monitor screen when replacing the engine controller or troubleshooting. (“Active Regeneration for Service”)
10-82
95LE-7 SERIES
