DIGITAL ENGINE KEN SHOULDERS. (USING HOMOGENOUS CHARGE COMPRESSION IGNITION) by BODEGA, CA

Transcription

1 DIGITAL ENGINE (USING HOMOGENOUS CHARGE COMPRESSION IGNITION) by KEN SHOULDERS BODEGA, CA

2 DIGITAL ENGINE SCHEMATIC

3 SEQUENCE: 1. Close main 2-way valves, V2 & V3, between the hydraulic cylinder and their sources. 2. Establish proper air pressure for accumulator #2 and high-pressure storage accumulator #1. 3. Open stroke end valve V4 in hydraulic cylinder. 4. Add air pressure and small amount of gas fuel to combustion cylinder through V1 to move it to BDC thus emptying fluid in hydraulic pump end of cylinder. Close V1. 5. Close BDC dump valve V4. 6. Open 2-way valve V3 to drive piston into compression region. 7. At proper position in compression cycle, fire spark for ignition of fuel and air. 8. Record pressure vs. time in combustion chamber, compression chamber and highpressure storage chamber. 9. Record bounce characteristic of piston vs. time by using piston position indicator to determine loss of energy during cycle.

4 THE COMPONENTS NEEDED FOR THE TEST ARE: 1. Cylinder for combustion and hydraulic pumping. 2. Piston for combustion and hydraulic pumping. 3. Small valve to dump the hydraulic fluid at BDC, V4. 4. Air admission system to push the combustion piston to BDC vent ports, V1. 5. Fuel mixer for air admission system. 6. Main electrically operated 2-way valves in the hydraulic flow path, V2 & V3. 7. Spark ignition system. 8. Detector of piston position (multi-electrode capacity diode bridge). 9. Pressure indicator for combustion chamber (capacity diode bridge). 10. Pressure indicator (capacity diode bridge) and fluid level for both high-pressure accumulator #1 and compression accumulator #2.

5 SCHEMATIC OF FLUID VOLUME BALANCE

6 DESCRIPTION OF FLUID COMPONENTS Vol. 1: High-pressure hydraulic cylinder at end of combustion chamber piston. Vol. 2: High-pressure accumulator (2,500 psi). Vol. 3: Low-pressure accumulator (100 psi). Vol. 4: Compression stroke driver to Vol. 1. V1: Main 3-way valve for switching fluid into and out of Vol. 1. V2: 3-way valve for charging compression stroke driver and relieving return stroke. V3: 2-way valve for recharge of Vol. 4 (This could be a 3-way valve to isolate Vol.1). V4: 3-way valve for driving compression stroke and relieving return stroke. VOLUMES: The volume of Vol. 4 must be slightly larger than Vol. 1. The volume of Vol. 2 & 3 must be slightly larger than Vol. 1.

7 CERAMIC CYLINDER, PISTON & SLEEVE VALVE Aluminum Oxide Ceramic Piston Diameter = or- 5 micro inches

8 HYDRAULIC VALVE FLOW TEST Fluid outlet valve Fluid collector Fluid pressure gage Ceramic cylinder Gas pressure gage Fluid outlet Orifice & Bunsen valve Gas outlet valve Fluid inlet Fluid inlet valve Gas outlet Spark plug Gas inlet Gas inlet valve

9 CAPACITY PRESSURE TRANSDUCER (FOR CYLINDER HEAD AND FLUID HEAD) Shielding cover Bypass capacitor Diodes Capacitor ground electrode Adjustment hole Capacitor adjusting screw Base Resistors Ceramic type, capacity pressure transducer (10 MHz input) Pressure tube Pressure inlet tube

10 SLEEVE VALVE RADIAL FLOW TEST Silicone rubber Bunsen valve Fluid collector Sleeve valve parts under test Slider Hydraulic head on test unit Expanded View of Radial Flow Test Fig. 1

11 PRESSURE TRANSDUCER (FOR CYLINDER HEAD) Fuel valve Ceramic plates Aluminum block Fuel/air line Ceramic piston RF lead to capacity gage Capacity diaphragm Fuel/air inlet Combustion chamber RF lead to capacity gage Ground lead of capacity gage Piston Ceramic diaphragm Spark lead Spark lead

12 PRESSURE GAGE TEST UNIT Fuel/air inlet Valve disc Capacity electrode Piston Metallized ceramic plate Pressure screw Cylinder Exhaust Ground electrode Mount plate Spark electrode

13 IMPULSE OSCILLATOR (USING SOLID CERAMIC PISTON) Valve disc Right side driver unit Fuel/air inlet Exhaust hole Piston Cylinder Capacity type pressure gage Spark gap

14 IMPULSE SLEEVE VALVE (COMPRESSION END ON RIGHT) Valve plate Spark electrodes (4 sets) Exhaust vents Sleeve valve Fuel inlet & exhaust plate Valve casing Switch Exhaust holes

15 IMPULSE SLEEVE VALVE (COMBUSTION END ON LEFT) Fuel inlet valve Switch Valve casing Fuel lines

16 Spark electrodes IMPULSE SLEEVE VALVE (ENLARGED VIEWS OF COMBUSTION END) Exhaust holes Fuel holes Exhaust Exhaust holes Fuel valve Fuel/air inlet Fuel lines

17 [DigEng Valve Timing] 6/12/02 Engine exhaust and intake sleeve valves operate independently under computer control as dictated by piston position and pressure sensors. Description of Components: Vol. 1: High-pressure hydraulic cylinder at end of combustion chamber piston. Vol. 2: High-pressure accumulator (2,500 psi). Vol. 3: Low-pressure accumulator (100 psi). Vol. 4: Compression stroke driver to Vol. 1. V1: Main 3-way valve for switching fluid into and out of Vol. 1. V2: 3-way valve for charging compression stroke driver and relieving return stroke. V3: 2-way valve for recharge of Vol. 4 (This could be a 3-way valve to isolate Vol.1). V4: 3-way valve for driving compression stroke and relieving return stroke. Valve Timing Diagram All valves shown below function by using a single sleeve valve located over the Compression Stroke Driver