Twin Mechanical Variable Lift Hydra - Ricardo
Twin Mechanical Variable Lift Hydra - Ricardo
Twin Mechanical Variable Lift Hydra - Ricardo
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<strong>Ricardo</strong> Advanced Research Engines – Single cylinders<br />
<strong>Ricardo</strong> Single Cylinder Research Engines<br />
<strong>Twin</strong> <strong>Mechanical</strong><br />
<strong>Variable</strong> <strong>Lift</strong> <strong>Hydra</strong><br />
The <strong>Ricardo</strong> <strong>Hydra</strong> is a light-duty single cylinder research engine<br />
ideal for combustion system studies or advanced research as well<br />
as component and product development.<br />
The <strong>Ricardo</strong> TMVL <strong>Hydra</strong> is a light duty<br />
single cylinder research engine designed for<br />
controlled auto-ignition combustion studies or<br />
similar advanced research.<br />
Homogeneous charge compression ignition<br />
(HCCI) or controlled auto-ignition (CAI) is a<br />
combustion mode where combustion initiates<br />
simultaneously at multiple sites and therefore<br />
there is little or no flame propagation. This<br />
leads to low temperature combustion and thus<br />
low NOx levels which is the key attraction of<br />
CAI.<br />
The TMVL <strong>Hydra</strong> achieves CAI in different ways<br />
but the most common is to use a high level<br />
of residual gas, either by retaining it or reinducting<br />
it via EGR.<br />
1 Trapping (Residual)<br />
1-2-3-4-1 External EGR<br />
1-2-1 Exhaust re-induction (Internal EGR)<br />
1-4-1 Intake re-induction<br />
Delivering Value Through Innovation & Technology<br />
www.ricardo.com
<strong>Ricardo</strong> Advanced Research Engines – Single cylinders<br />
The Valvetronic <strong>Variable</strong> Valve<br />
Actuation System<br />
The Valvetronic system provides variable lift, period and timing for the<br />
inlet valve and variable timing for the exhaust valve. It achieves this by<br />
using phasers for the inlet and exhaust camshafts and an additional<br />
mechanical lever to give variable lift and period for the inlet valve.<br />
<strong>Ricardo</strong> offers advanced single cylinder research engines as part of a package of equipment and services. The<br />
package can be built up as each customer requires, depending on which elements are needed.<br />
The Valvetronic valvetrain is used on the <strong>Ricardo</strong> TMVL CAI <strong>Hydra</strong> research engine. The original TMVL engine is a 4<br />
cylinder, 2.0 litre BMW N42 engine modified by <strong>Ricardo</strong> to use Valvetronic systems on both the inlet and exhaust<br />
valves. The TMVL engine has been used by <strong>Ricardo</strong> for research studies on SI and CAI combustion with port fuel<br />
injection.<br />
The TMVL <strong>Hydra</strong> is normally supplied with <strong>Ricardo</strong>’s own ECU, the rCube NVC controller.<br />
The <strong>Ricardo</strong> rCube ECU has been calibrated for both SI and CAI operating ranges. The calibration software<br />
is supplied with a pre-configured experiment. Using this experiment, it is possible to change the following<br />
parameters:<br />
• Operating mode<br />
• Fuelling (quantity and timing)<br />
• Spark timing<br />
• Valve lift (inlet and exhaust)<br />
• Valve timing (inlet and exhaust)<br />
• Fuel rail pressure<br />
• Throttle position<br />
• EGR valve position<br />
Engine Specification<br />
Bore<br />
86.0 mm<br />
Stroke<br />
86.0 mm<br />
Number of cylinders 1<br />
Capacity<br />
500 cc<br />
Compression ratio 10.5:1<br />
Valves / cylinder 4<br />
Combustion system<br />
Gasoline DI – homogeneous charge<br />
Aspiration<br />
Naturally aspirated<br />
Maximum speed<br />
4,500 rev/min<br />
Minimum speed<br />
1,200 rev/min<br />
Maximum power<br />
24 kW<br />
Maximum torque<br />
46 Nm<br />
Fuel injection system<br />
Bosch injector from VW FSI engine<br />
Valve actuation system<br />
BMW Valvetronic units<br />
ECU<br />
rCube NVC Unit<br />
If your company is interested in <strong>Ricardo</strong> research engines then please contact us<br />
for further information:<br />
Glen Hall<br />
Projects Coordinator Engineer<br />
T: +44 (0)1273 794469<br />
F: +44 (0)1273 794111<br />
Email: Glen.Hall@ricardo.com<br />
<strong>Ricardo</strong> UK Ltd<br />
Shoreham Technical Centre<br />
Shoreham-by-Sea<br />
West Sussex<br />
BN43 5FG<br />
Email: ResEng@ricardo.com<br />
Delivering Value Through Innovation & Technology<br />
www.ricardo.com