510
• loading of brake system
• oil temperature in the drivetrain (gearbox torque converter)
The experiment was conducted over a period of two weeks. First, a data sample was collected for a machine with an active lock-up function. Then, the lock-up function was blocked
in the transmission control software. In both cases data have been acquired by already mentioned on board monitoring system.
2.5 Presentation of acquired data
In the Fig. 5 a raw data from on-board monitoring system are presented. The analysed data
are related to such factors as breaking pressure, engine speed, position of the gas pedal
[0–100%], instantaneous fuel consumption, oil temperature of transmission and torque
converter, direction and current gear, average speed in every 1s, position of the brake pedal
[0–100%] and lock up on/off. Based on these data some basic (primary) and indirect (secondary) KPIs will be calculated. By visual inspection of raw data it is very hard to estimate the
influence of lockup system on temperature or fuel consumption. According to our experience, high variability of the data, their streaming character, random disturbance in the
signal during acquisition in real mining conditions etc., requires practically advanced signal
processing and analysis including validation, pre-processing, calculating basic features [5]
and finally high-level performance indicators [4, 5, 6, 8, 9].
3 METHODOLOGY
3.1 The lock up system and operational efficiency analysis—a brief review
The reason for installation of the lockup system in regarded machines was to improve effective engine-based braking while driving on underground workings with a high slope and to
minimize energy losses during stationary part of the process i.e. driving at constant speed on
straight, flat road.
The main purpose of these experiments was to verify whether the lock up will really provide
the effects for loaded machine driving and how big this impact is. The mechanical blocking
of the converter’s rotors should improve the efficiency of power transfer to the wheels, and
consequently reduce the fuel consumption. The use of lockup for heavy, low-speed machines
Figure 5. A raw data monitoring system– an example used in calculations.
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• loading of brake system
• oil temperature in the drivetrain (gearbox torque converter)
The experiment was conducted over a period of two weeks. First, a data sample was collected for a machine with an active lock-up function. Then, the lock-up function was blocked
in the transmission control software. In both cases data have been acquired by already mentioned on board monitoring system.
2.5 Presentation of acquired data
In the Fig. 5 a raw data from on-board monitoring system are presented. The analysed data
are related to such factors as breaking pressure, engine speed, position of the gas pedal
[0–100%], instantaneous fuel consumption, oil temperature of transmission and torque
converter, direction and current gear, average speed in every 1s, position of the brake pedal
[0–100%] and lock up on/off. Based on these data some basic (primary) and indirect (secondary) KPIs will be calculated. By visual inspection of raw data it is very hard to estimate the
influence of lockup system on temperature or fuel consumption. According to our experience, high variability of the data, their streaming character, random disturbance in the
signal during acquisition in real mining conditions etc., requires practically advanced signal
processing and analysis including validation, pre-processing, calculating basic features [5]
and finally high-level performance indicators [4, 5, 6, 8, 9].
3 METHODOLOGY
3.1 The lock up system and operational efficiency analysis—a brief review
The reason for installation of the lockup system in regarded machines was to improve effective engine-based braking while driving on underground workings with a high slope and to
minimize energy losses during stationary part of the process i.e. driving at constant speed on
straight, flat road.
The main purpose of these experiments was to verify whether the lock up will really provide
the effects for loaded machine driving and how big this impact is. The mechanical blocking
of the converter’s rotors should improve the efficiency of power transfer to the wheels, and
consequently reduce the fuel consumption. The use of lockup for heavy, low-speed machines
Figure 5. A raw data monitoring system– an example used in calculations.
!
'" wo_ WN
§•o;
-~o~
-~oj
I
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