An audible pedestrian warning system will be offered in the world’s first hybrid vehicle as standard. Infiniti said that this system, which is installed in Infiniti’s upcoming M35h model, features a variable pitch and volume tone synthesizer. It is computer-controlled and it works automatically from 0-19 mph. Infiniti clams that this warning sound is a 'sine-wave', audible to all age groups and produces a minimal level of noise pollution.
Whether the sound is in high or low frequency depends on the vehicle speed and if the M35h is accelerating or decelerating. The car is powered by a 3.5-litre V6 petrol engine with 302bhp and this is paired with the hybrid’s 67bhp electric motor. The car has a 0-60mph sprint time of 5.9 seconds and it has a fuel economy figure of 39mpg.
The Infiniti M35h will become the world’s first hybrid to feature an audible pedestrian warning system as standard when it goes on sale in six months’ time. The ground-breaking high performance hybrid model, which can travel further and faster in silent electric-only mode than other hybrids, utilises a range of distinctive sounds to help ensure the safety of other road users. Infiniti broke new ground when it rolled out the Infiniti M35h in 2012.
For instance, the M35h was the first of its kind to feature a pedestrian warning system, which was basically a necessity due to the car’s extremely silent electric mode. The system warns pedestrians as well as other vehicles of the M53h’s presence through a variety of sounds that road users can definitely recognize. The system was standard to all models of the M53h, and employed a speaker mounted on the front bumper of the unique sedan.
This synthesizer system is centrally controlled by the car’s computer. As soon as the vehicle is started, the system is automatically engaged up until the vehicle attains a cruising speed of 30 kilometers per hour. If the car slows down to 25 kilometers after cruising, the system is reactivated. The revolutionary acoustic system is the result of the collaboration between the Infiniti team and a team of psychologists that specialized in studying pedestrian behavior and the effects of noise to the human psyche.
The result was a system that employed a variety of sound effects aimed to be effective but not contributing to noise pollution in the highway. Specifically, the M35h’s warning system makes use of a sine-wave sound that operates at the 600Hz to 2.5kHZ frequency range. The system also employs variable volume when playing the sounds in the pedestrian warning system. When the car is started up, the system turns up the volume to the highest level to warn nearby cars and pedestrians that the M35h is ready to roll out.
When the driver is reversing the M35h, the system emits an on-and-off sound that warns pedestrians but does not shock them into doing something drastic. A testimony to the efficiency and noise-reducing capacity of the M35h’s engine is the fact that it does not generate noise at all even when running in 80 kph!
As for the electric power plant’s capacity and range, tests reveal that the car can run in full electric mode for as long as half the total time it is taken out on long-distance riding in differing road conditions. Every M35h that rolled out to European customers by spring of 2011 carried the Approaching Vehicle Sound for Pedestrian feature as a standard. This system, along with a host of other safety features like the Dynamic Safety Shield, makes the M35h a safe and efficient vehicle to drive.
Not only is it silent and safe, the M35h also featured unparalleled fuel efficiency and carbon emissions. The Direct Response Hybrid technology pairs the car’s 68 PS electric motor with a 225 kW 3.5-liter petrol V6 engine.
This combination makes for an impressive 5.9-second sprint to 100 km/h from a standstill, whiile emitting virtually no carbon monoxide. As for fuel consumption, it takes 100 kilometers for 7.3 liters to be consumed. These features make the Infiniti M35h a direct challenge to the top European executive car models from other brands.