Earlier this month, GM outlined its electric path to zero emissions, and introduced SURUS—the Silent Utility Rover Universal Superstructure (SURUS)—a fuel-cell-powered, four-wheel steer concept vehicle on a heavy-duty truck frame that’s driven by two electric motors. (Earlier post.) Now, GM has provided a few additional insights into the construction of and role for SURUS.
SURUS leverages GM’s newest Hydrotec fuel cell system, autonomous capability and truck chassis components to deliver high-performance, zero-emission propulsion to minimize logistical burdens and reduce human exposure to harm. Benefits include quiet and odor-free operation, off-road mobility, field configuration, instantaneous high torque, exportable power generation, water generation and quick refueling times.
Fuel cell technology represents a key piece of General Motors’ zero emission strategy. It offers a solution that can scale to larger vehicles with large payload requirements and operate over longer distances. SURUS was designed to form a foundation for a family of commercial vehicle solutions that leverages a single propulsion system integrated into a common chassis.
The SURUS platform is equally well-suited for adaptation to military environments where users can take advantage of flexible energy resources, field configurability and improved logistical characteristics. GM is evaluating multiple applications for SURUS, such as:
- Utility trucks
- Mobile and emergency backup power generation
- Flexible cargo delivery systems
- Commercial freight
- Light- and medium-duty trucks, improving upon the Chevrolet Colorado ZH2 that has been evaluated by the US military under guidance of the US Army Tank Automotive Research, Development and Engineering Center (TARDEC) and is undergoing testing on bases (earlier post) (The ZH2 is the first fuel cell vehicle to wear the GM Hydrotec badge, a familial tie to the Ecotec gasoline engines.)
- Future military-specific configurations
SURUS will deliver highly mobile autonomous capability and agility in unpredictable terrain. Operating multiple vehicles in a leader-follower configuration could reduce manpower needed.
For future potential military uses, the system’s inherent low heat signature and quiet operation offer benefits in environments to reduce detection and risks. TARDEC has been in discussions with GM evaluating the commercial SURUS concept as a next step of the broader collaboration to evaluate fuel cell technology for future military applications.
|The Exportable Power Takeoff (EPTO) feature demonstrates how high-voltage DC from the fuel cell stack could be converted to both high- and low-voltage AC to power tools or equipment. Click to enlarge.|
SURUS redefines fuel cell electric technology for both highway and off-road environments. General Motors is committed to bringing new high-performance, zero-emission systems to solve complex challenges for a variety of customers.—Charlie Freese, executive director of GM Global Fuel Cell Business
The SURUS platform leverages GM’s vast experience in fuel cell technology, high-voltage batteries and electric drive systems, autonomous driving and vehicle manufacturing. The platform features:
- Two advanced electric drive units
- Four-wheel steering
- Lithium-ion battery system
- Gen 2 fuel cell system
- Hydrogen storage system capable of more than 400 miles of range
- Advanced propulsion power electronics
- GM truck chassis components
- An advanced, industry-leading suspension
The SURUS commercial platform draws on GM’s more than 50 years of research and development of fuel cell technology. The scalable and adaptable technology enables land, sea and air applications across commercial and military environments.
Since April 2017, the Army has been testing the commercial Chevrolet Colorado ZH2 on its US bases to determine the viability of hydrogen-powered vehicles in military mission tactical environments. The vehicle has been operating in off-road conditions to evaluate its power generation, reduced odor, acoustic and thermal signatures, high wheel torque, extended operating range and the potential to use the byproduct water.
Military testing has shown the ZH2 reduced acoustic non-detection distance by 90% compared to current military vehicle in operation. This means the ZH2 can get 10 times closer before being detected. Leaders also observed the potential advantages for stationary power generation over diesel generators, including a significant reduction in idle noise and fuel use. Testing will continue through spring 2018.
Partnerships remain an important part of GM’s electrification strategy. Last year, the US Navy unveiled a GM fuel cell-powered Unmanned Undersea Vehicle (UUV) for testing purposes that leverages GM fuel cell technology common with the Colorado ZH2.
General Motors aims to solve some of the toughest transportation challenges created by natural disasters, complex logistics environments and global conflicts. The company will display its Silent Utility Rover Universal Superstructure (SURUS), a flexible fuel cell electric platform with autonomous capabilities, at the fall meeting of the Association of the United States Army (AUSA) from 9-11 October 2017. The commercially designed platform could be adapted for military use.