Hitachi has launched two new rigid-body dump trucks for use at large-scale mining operations - the 180 ton-payload EH3500AC-3 and 220 ton-payload EH4000AC-3 - completing its’ EH AC-3 series. Both models are equipped with an AC drive system coupled with a load-responsive IGBT inverter that was developed with Hitachi Group technologies.
The Hitachi Drive Control System includes various sensors to provide information on driving conditions. The result is reduced tyre slippage on acceleration and lock-up during braking. The system also prevents chassis oscillation in a front-rear direction and tyre skid while steering.
Hitachi plans to offer two engine choices from different manufacturers - Cummins and MTU - and this option will also extended to the EH5000AC-3 rigid dump truck which was introduced in February 2013. A new evacuator exhaust valve for the engine suction filter and electric grease pump are among the features added to improve daily maintenance.
In the wide-berth cab, which is capable of housing two full-size seats, a large multi-lingual LCD display provides the operator with information and warnings such as travelling speed, engine turnover and hauling performance. Levers and switches for operating the dump body are located in the centre console, making it possible operate it with one hand.
The mainframe’s structural design, including the cab support, has been improved based on operating information gathered from Hitachi trucks globally. A temperature sensor has been added to the alternator and drive motor. This triggers an alarm if abnormal conditions are detected and restricts operation to prevent sudden damage to the machine.
Improvements have also been made to the nominal payload measurement system, and errors have been reduced by reflecting changes in fuel weight within the fuel tank in the nominal payload.
Hitachi says it has also achieved a high level of interchangeability for common engine and hydraulic system components used across its AC drive dump trucks and ultra-class hydraulic excavators.
Meanwhile, the Hitachi Construction Machinery Group is set to use Nissan Motor’s around view monitor (AVM) and moving object detection (MOD) technology for its trucks, following a licensing agreement. The agreement will enable Hitachi to provide AVM and MOD technology to its massive haul trucks and hydraulic excavators working at large open pit mines.
The technologies jointly developed by Nissan and Clarion form the building blocks of autonomous driving technology that will operate commercially viable Nissan Autonomous Drive vehicles by 2020.
In real-time, the AVM-MOD technology detects any movement or workers in the area when drivers start operating the vehicle, drop cargo, back up to load cargo, or when a hydraulic shovel is used in close proximity to the vehicle. This enables the driver to work with situational awareness leading to safety improvement. The parking support system AVM offers the driver a bird’s eye view of the vehicle’s surroundings in real-time using four exterior cameras.
According to Nissan, the driving assistance technology MOD, evaluates the images from the AVM cameras and warns the driver with visual and audio alerts when it detects moving objects around the vehicle.
AVM and MOD technologies were launched on the market in 2007 and 2010, respectively.