new V-Charge

Torotrak’s V-Charge is a variable drive supercharger for gasoline and diesel engines. V-Charge allows downsized engines to maintain their superior emissions levels, whilst retaining the driving feel, urgency and enjoyment of a larger engine. Compact and easy to install, V-Charge offers a substantial cost advantage over more complex devices.

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Technology Background

Adding forced induction to downsized engines is acknowledged as one of the most effective ways of reducing CO2 emissions and as a result, the automotive industry is rushing to downsize. Typically, a three-cylinder 1-litre engine will now replace a four cylinder 1.6-litre model, with a pressure charging device added to emulate the performance of the larger engine, while retaining superior fuel economy.

However, mass uptake of this technology is hampered by the issue of “turbo lag” that conventional boosting devices produce. The driver experiences this as poor responsiveness and driving feel at low speed and so finding a low cost solution to this problem is an industry priority.

Torotrak has developed V-Charge specifically to address this flaw.

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How V-Charge Delivers

By accurately and rapidly varying boost pressure independently of engine speed, V-Charge ensures that the engine responds instantly to any driver demand. The optimum mass of air can always be delivered to the cylinders, at any engine speed, without any of the lag often associated with turbochargers. This remains true even at very low engine speeds where conventional boosting systems often struggle to deliver.

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V-Charge Features

  • “Cold Side” Installation - no need for exotic materials; freedom of system location; doesn’t impede exhaust gas
  • High Ratio - typically provides a compressor speed to engine speed ratio range of 9 to 90
  • Industry Standard Control – the ratio is controlled by a low force, low cost electromechanical actuator, which is fully compatible with engine ECUs and therefore integrates fully with the existing engine management strategy
  • Industry Standard Belt Drive - can be driven by a conventional belt drive that is easily integrated with the existing auxiliary belt drive on most engines

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V-Charge Benefits

  • Rapid response and “Time to Torque” - delivers from 0 to 95 per cent of target torque in just 400 milliseconds and removes boost just as quickly when not required. This minimises energy use and creates ‘lag free’ driveability at low engine speeds, with excellent transient response
  • Exceptional Refinement - extremely smooth and near silent operation with unparalleled levels of Noise Vibration and Harshness (NVH) refinement;  no requirement to bypass or vent air via a wastegate
  • Superior Performance -  the ability to vary speed outperforms complex multistage turbochargers whilst using only a simple fixed geometry compressor. Location on the inlet side of the engine means no impediment to exhaust gas flow
  • Low Cost, Small Package - compact and power dense package comprises a small, two roller, single cavity traction drive variator. Low component count and innovative manufacturing techniques provide a highly competitive cost, while the variable speed drive also removes the need for additional air handling subsystems
  • Proven Boosting Technology – this is the same as the compressor stage of a conventional fixed geometry turbocharger and is easily matched to any engine

 

 

 

 

 

 

 

 

V-Charge V2.5 Unit

The V-Charge unit
 

 

 

Torotrak-0021-2 (Large)

Our V-Charge demonstrator vehicle
 

 

 

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V-Charge Exploded View
 

 

 

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V-Charge disc and roller