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Electric transmission for crawler bulldozer
In the construction industry, completing work on time plays a crucial role. One of the key pieces of equipment on a construction site is the bulldozer.
Tracked bulldozers have a complex and expensive-to-maintain transmission. Diesel fuel prices and supply are unstable nowadays. These factors can lead to abnormal situations.
Switching to an electric transmission increases the reliability of a bulldozer by simplifying its design—enabling in-place turning, smooth traction control, and cruise control without complex mechanical gears. A hybrid powertrain offers savings on fuel and maintenance.
One of our projects is an electric transmission for a track-type ripper bulldozer.
Composition and principle of operation:
01
Hybrid drive
The bulldozer's hybrid drive is based on RUBRUKS HVM-PM1-65 permanent magnet synchronous generator and the bulldozer's diesel engine.
The RUBRUKS NTPI-600-50 AC-DC converter is used to convert alternating voltage generated by a generator into direct current.
02
Electric drivetrain
The electric transmission is implemented by two RUBRUKS GMV-55-360-WG24 gearmotors, which drive the bulldozer's wheels.
Two ensure the control of electric motors tractive inverter RUBRUKS NTPI.
04
Management
System component management is performed via the CAN information exchange protocol. RUBRUKS CL3-2C CAN logger records data from the CAN bus for analysis and diagnostics.
05
CAN bus control
The control elements are also connected via a CAN bus. To select the direction of travel, RUBRUKS DMS-3L-CAN Driving Mode Selector. Engine speed is controlled by the RUBRUKS AP-2AO accelerator pedal.
Comparative Cost of Ownership:
| Diesel bulldozer | Hybrid bulldozer | |
|---|---|---|
| Average fuel consumption | 12 L/hr | 3.78 gallons/hour |
| Work shift duration | 8 AM | 8 AM |
| Total fuel consumption | 96 L/day | 72 L/day |
| Fuel cost | 57 RUB/L | 57 RUB/L |
| Total fuel cost | 5,472 rubles/day | 4,104 rubles/day |
| Saving | 1,368 rubles/day | |
| Saving | 451,440 rubles/year | |
| Bulldozer price | 10,000,000 rubles | 12,500,000 rubles |
| Price difference | -2,500,000 RUB | 2,500,000 rubles |
| Operating standard | 330 days/year | 330 days/year |
| Service life | 8 L | 8 L |
| Cost of ownership | 20,446,080 rubles | 19,334,560 rubles |
| Saving | 1,111,520 rubles | |
| Saving | 5 % |
Possible modifications:
01
Energy storage system based on battery modules RUBRUKS HVB. Allows the bulldozer to move entirely on electric power with the internal combustion engine turned off.
On-board charger RUBRUKS RBC2-600-22 used to charge batteries from a 1- or 3-phase AC power supply.
The maintenance of the operating temperature of the battery modules is the responsibility of temperature control unit.
02
380V 50Hz network for powering external consumers. Implemented by connecting RUBRUKS NPI DC-AC Converters to the high-voltage line of the system.
Consumers connect to outlets that are brought out to the distribution board.
03
Radio channel for remote control. Consists of a radio channel unit and an interface unit.
Bulldozer operation is controlled from a remote control.
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