Green Car Congress Lotus Engineering Develops Sound Simulation …

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Lotus Electric Cars

5 August 2008

The Safe Hybrid system. Click to

Lotus Engineering has developed to synthesize external sound on and hybrid vehicles to counteract the concern these ‘quiet’ pose to pedestrians and cyclists. applied the technology to a standard Prius to create a ‘Safe Hybrid technology demonstrator

The solution that Lotus has is a novel reapplication and development of its Synthesis technology. Sound is one element in the Lotus suite of active noise technologies, three main systems of which can be used individually or in Active Road Noise Engine Order Cancellation and Synthesis.

To synthesize the engine sound, a speed signal is taken the vehicle and a waterproof loudspeaker is positioned adjacent to the radiator the sound to emanate from the of the vehicle. When the car is operating on the motor only, throttle and dependent synthesized sound a realistic engine sound in of the vehicle. Once the vehicle has the sound is not heard.

The technology was around the behavior of a conventional using an existing engine which makes it instantly with the pitch and frequency to identify vehicle distance and If the hybrid’s engine starts at higher speeds or throttle or lower battery levels, the system automatically stops the synthesis.

When the powertrain control switches the car back to running on the motor only, the synthesis instantaneously sets the system again. It is all completely automatic and the hears almost none of the sound.

In order to generate the sound, recordings of a suitable engine were made and to establish the characteristic frequencies at engine speeds. These are then entered into the controller in the form of a ‘voice’ outputs the sound through an and out through the loudspeakers.

Lotus Electric Cars

Lotus Active Noise . Active Road Noise (ARNC) and Engine Order (EOC) look to reduce levels in the cabin, particularly at that are audibly unpleasant. In the of road noise, the system broadband noise levels at below 250Hz whereas EOC harmonic frequencies generated by events in the engine.

Input from the engine (for or sensors mounted to the suspension (for ARNC) are fed into the controller, as are sound signals, by microphones located in the cabin. The algorithms of the controller then what sound is needed to cancellation and the speakers of the in-car system are used to put this the cabin. All this occurs in the of a few hundredths of a second and repeats and constantly through the control seamlessly and instantaneously adapting to in speed or road condition.

The cancellation system operates on the signals so other noise in the such as the audio system and are not interfered with or cancelled. The is a quieter, more pleasant

The third system, Sound enhances the sound in the cabin. The system uses engine signal, a throttle position and the in-car entertainment system to add In this way a car could be made to sportier or be given the sound of, say, a flat 6 or V8 engine.

with EOC and ARNC, the interior in the cabin can be tuned to enhance the experience and match the brand of the vehicle.

Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars
Lotus Electric Cars

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