Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 192
14.3 Emissions Critical Components Monitoring & Protection
Tier 4 Final /Stage IV Emissions standards stipulate that the use of operator
inducements are mandatory for all SCR equipped non road engines. The
term Inducement covers any actions intended to alert / prompt the operator of
a machine to repair or perform maintenance on the emissions control system.
Examples of inducements are use of engine warning lamps, engine torque or
power derates and engine speed limiting etc.
14.3.1 Inducement Strategy High Level Overview
The 1204F to 1206F engine inducement strategy can be split into four distinct
escalation sections;
• Warning indicators
• Specific Fault messages
• Engine Torque derates
• Final engine inducement strategies including forced engine idle down
or shutdown.
The areas of the emissions system covered by the legislation and therefore
forming part of the specific Inducement strategy are;
• Low DEF Level
• Poor DEF Quality (Q)
• Dosing Interruption (D)
• System Tampering (T)
• Impeded EGR (E)
Whilst the requirement for specific Inducement strategies relating to the
engine emissions system are required by both the EU and EPA, the
mandatory implementation requirements for each legislation do vary. For this
reason Perkins has implemented a combined inducement strategy, which
meets both emissions standards.
14.3.2 Combined EU/EPA Inducement Strategy Operation
The combined EU/EPA Inducement strategy can be segmented into specific
responses for;
• DEF Quality, Tampering and Dosing Interruption
• Impeded EGR
• Low DEF Level
In the event of one or more of these conditions becoming active the engine
control system will raise an engine diagnostic or event code for the specific
item or system causing the problem. In addition to this diagnostic code the
engine will also raise further codes to indicate that the inducement strategy
has been operated. The initial Diagnostic / event code is designed to activate
the engine warning indicator as with all engine related problems. The second
set of codes shown below are responsible for activation of the operator
annunciation strategy shown in sections 14.3.2.1, 14.3.2.2 and 14.3.2.3.