C-10, C-12 and C-15 On-highway Engines Caterpillar

Idle Parameters

Usage:

C-10 MBJ

"Idle Vehicle Speed Limit"

The "Idle Vehicle Speed Limit" is the maximum vehicle speed for setting or maintaining a set engine rpm in the idle mode. In order to enter the idle mode, the engine rpm must be set by the Set/Resume switch while the Cruise Control On/Off switch is in the ON position. If the vehicle speed signal exceeds this value, the engine will not maintain the set engine rpm.

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Table 1
Minimum	Maximum	Default
2 km/h (1 mph)	24 km/h (15 mph)	2 km/h (1 mph)

"Idle RPM Limit"

The "Idle RPM Limit" is the maximum engine rpm in idle mode. The idle mode occurs if the engine rpm is set by using the Cruise Control On/Off switch and the Set/Resume switch. The actual high limit of this parameter is determined by the programmed Top Engine Limit. The lower limit is determined by the programmed "Low Idle Engine rpm".

Programming this parameter to 600 rpm will prevent the engine from idling at a constant rpm above the programmed Low Idle rpm.

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Table 2
Minimum	Maximum	Default
600 rpm	TEL rpm	TEL rpm

"Idle/PTO RPM Ramp Rate"

The "Idle/PTO RPM Ramp Rate" determines the rate of increase or decrease of engine rpm. This parameter determines rates of increase or decrease in engine rpm for the following functions:

Idle rpm
PTO rpm

The parameter can be set to a value between 5 rpm and 1000 rpm in one rpm increments.

Note: The parameter affects both idle control and PTO control. The idle mode occurs if the engine rpm is set by using the Cruise Control On/Off switch and the Set/Resume switch. The PTO mode occurs if the engine rpm is set by using the "PTO On/Off" switch and the Set/Resume switch.

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Table 3
Minimum	Maximum	Default
5 rpm/sec	1000 rpm/sec	50 rpm/sec

"Idle/PTO Bump RPM"

The "Idle/PTO Bump RPM" determines the increment or the decrement in engine rpm when the ACCEL switch or the DECEL switch is briefly toggled. The "Idle/PTO Bump RPM" also pertains to the dedicated PTO and idle. If a "PTO Engine RPM Set Speed" has been programmed, the "Idle/PTO Bump RPM" pertains only to the control of the engine rpm that is initiated by using the "Cruise Control On/Off" input circuit. If a PTO Engine rpm Set Speed has been programmed, the "Idle/PTO Bump RPM" also pertains to the control of the engine rpm that is initiated by using the "PTO On/Off" circuit.

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