The updated Allison Transmission H40EP and H50EP Hybrid Systems feature enhancements including Allison Fourth Generation Electronic Controls, a second-generation DPIM2 (Dual Power Inverter Module 2) unit, the latest ESS2 (Energy Storage System 2), and new Allison HyValue™ performance features. Furthermore, Allison has taken the next major technological step with the introduction of DC to DC converter capabilities.
Fourth Generation Electronic Controls
Allison’s latest microprocessor controls feature hardware which is common to all high-volume Allison commercial transmissions. The controls have greater processing power and memory capability with memory expansion that allows for further technology evolution.
DPIM2 (Dual Power Inverter Module 2)
The second-generation DPIM2 (Dual Power Inverter Module 2) unit features enhanced internal hardware with superior redundancy for greater reliability. Externally, this new unit is fully interchangeable with all prior production units, giving users maximum maintenance flexibility.
ESS2 (Energy Storage System 2)
Allison’s second-generation ESS2 (Energy Storage System 2) utilises the latest Nickel Metal Hydride battery cell technology from Panasonic. The high-capacity cells are common to both the Allison Hybrid H40EP and H50EP Systems. Allison has used Panasonic Nickel Metal Hydride batteries in the ESS since the start of production in 2003, and it has proven itself in more heavy-duty hybrid buses than any other brand or battery chemistry.
The EV Drive™ module is a Two-Mode Parallel Hybrid that automatically delivers benefits typical of parallel hybrid or series hybrid technologies. The continuously variable drive features an infinite number of ratios and automatically adjusts ratios to operate at optimum power curves to attain the best performance and fuel economy. The EV Drive™ automatically chooses one of an infinite number of ratios to run engines at their most efficient points for low fuel consumption, low emissions and low noise.
The H40/50EP System also has the Allison HyValue™ performance features HyGain™, HyIdle™, and HyTraction™. With Allison’s HyGain™ feature, fleets can adjust the acceleration rate to fit their operating requirements. Adjusting HyGain™ downward further increases fuel economy. HyGain™ allows OEMs and fleets to adjust bus acceleration to one of five settings. Lowering the setting reduces acceleration and further reduces fuel consumption, as well as lowering engine speed and noise.
DC to DC converter
Allison has also taken the next major technological step with the introduction of DC to DC converter capability. A solid-state DC to DC converter eliminates the traditional alternator to provide greater reliability while lowering operational costs and maintenance issues. The DC to DC converter will not use the ESS2 for storing energy, thereby maintaining outstanding hybrid battery life. DC to DC converters have the nickname of “beltless alternator” since they are solid-state devices that maintain electrical efficiencies of 91-95 percent. Having such a high electrical efficiency, these converters replace large belt-driven alternators, and do not require any type of mechanical belt drive system or associated maintenance requirements. The DC to DC converter powers not only traditional 12/24-volt loads, but also accommodates the electric radiator, charge-air-cooling and hybrid drive electric fans providing better efficiency and eliminating hydraulic fan drives.
The following DC-DC converter capabilities are available:
• 250 Amp-at-Idle DC-DC Converter
(equivalent to some 400 amp belt driven alternators)
• 300 Amp-at-Idle DC-DC Converter
(equivalent to some 450 and 500 amp belt driven alternators)
There are over 4,600 buses and coaches equipped with the Allison Hybrid EP System in operation around the world providing over 600 million kilometres of reliable, fuel efficient and low emission service. These hybrid buses are operating in over 216 cities worldwide and have saved an estimated 75 million litres of fuel as well as eliminating over 197,000 metric tons of CO2.
About Allison Transmission
Allison Transmission is the world’s largest manufacturer of fully-automatic transmissions for medium- and heavy-duty commercial vehicles, medium- and heavy-tactical U.S. military vehicles and hybrid-propulsion systems for transit buses. Allison transmissions are used in a variety of applications including on-highway trucks (distribution, refuse, construction, fire and emergency), buses (primarily school and transit), motor homes, off-highway vehicles and equipment (primarily energy and mining) and military vehicles (wheeled and tracked). Founded in 1915, the Allison business is headquartered in Indianapolis, Indiana, U.S.A. and employs approximately 2,750 people. Regional headquarters with dedicated support staff are located in China, The Netherlands, Brazil, India and Japan. With a global presence in 80 countries, Allison has over 1,500 independent distributor and dealer locations. More information about Allison is available at www.allisontransmission.com.
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