Research by vehicle transmission specialist Antonov Automotive Technologies suggests that simple dual-speed drives can help alternators and other engine ancillaries operate more efficiently.
By more closely matching drive speed to the vehicle requirements there can be an improvement in the recharging of batteries according to the UK-based company, which addressed a crowd of industry experts at the Millbrook Proving Group at the inaugural Cenex event.
Autonov has introduced a mechanical module (AMM) which acts as a self-controlling automatic two-speed gearset that can be tuned to meet specific vehicle requirements. It can be applied as a dual-pulley unit to give a two-speed belt driven alternator, air conditioning pump and water conditioning pump. By accumulating energy savings, the system can reduce fuel consumption by 5.6 per cent.
According to Chris Baylis, operations director at Antonov, the product has been built as a reaction to consumer demand.
“Customers and legislators are placing more demands on vehicle electrical power, with lower emissions meaning smaller petrol and diesel engines, lower engine idle speeds and more stop-start systems,” he said. “Even daytime headlight legislation is increasing the electrical load.”
“Maximising the overall operating efficiency with fixed drive alternators, water-pumps, superchargers – indeed any crankshaft driven or electric motor ancillary – is becoming more and more difficult. At high engine speeds this can result in unacceptable losses or even excessive speeding outside their most efficient operating range.”
When applied to an alternator the Autonov dual-speed module can increase electrical output for regenerative braking and reduce engine idle speed without battery charging issues. The company is now working on a two-speed electric vehicle transmission.
