ELECTROHYDRAULICCAMLESS ENGINE

SHIJIL.P.K M7A 7352

WORKING OF CAM ENGINES

• Crank shaft turn the cam shaft• Cam lobe pushes down the pushrod and it opens

the valve• Return motion is carried out due to spring action

on push rod• This results in closing of the valve

(Animation)

NEED FOR CAMLESS ENGINES

• In a conventional engine, the camshaft controls intake and exhaust valves.

• Valve timing, valve lift, and event duration are all fixed values specific to the camshaft design.

• Cams open and close the valves at the same precise moment in repeated cycle of operations

• They do so regardless of whether the engine is idling or spinning at maximum rpm.

• So the engine designers can achieve optimum performance at only one speed.

• The camshaft limits engine performance in that timing, lift, and duration cannot be varied.

OVERVIEW

• Five sensors are used Sensing the speed of the engine Sensing the load on the engine Exhaust gas sensor Valve position sensor Current sensor.

•Sensors send signals to the ECU.

•Electronic Control Unit Consits of a microprocessor provided with a software algorithm. Issues signals to the solid-state circuitry

•This signals controls the actuator

• 3 vital components – Sensors, Electronic Control Unit and Actuator

1. Hydraulic pendulum

Hydraulic pendulum involves conversion of potential energy into kinetic energy and back into potential energy with minimal energy loss

ASSOCIATED CONCEPTS

2. Valve opening and closing

3. Valve motion control

Valve lift can be controlled by varying the duration of the solenoid voltage pulse

COMPONENTS

• Engine valve• Solenoid Valve• Lift Modifier• Low Pressure Pump• High Pressure Pump• Cool Down Accumulator

Sketches

ADVANTAGES• Independent control of all aspects of valve motion, valve lift,

valve open duration etc• Freedom to optimize all parameters of valve motion based on

driving condition • Reduced engine size and weight• Better fuel economy (almost by 7-10%)• Higher torque and power• Improved idle stability• Lower exhaust emissions (NO x emission reduced by 30%)• Better breathing at low engine speeds

CONCLUSION

• System employs the hydraulic pendulum principle, which contributes to low hydraulic energy consumption.

• The electro hydraulic valve train is integral with the cylinder head, which lowers the head height and improves the engine packaging.

• Substantial improvements in performance, fuel economy, and emissions over and above what is achievable in engines with camshaft-based valve trains.

• Further research and development are needed to take full advantage of this system

THANK YOU