Jet brake

Technical Field

This research looks for developing active / passive safety in automotive field through creating new philosophy of safety as add to current design. Background Art

When the brake pedal is depressed, hydraulic or pneumatic force presses brake pads against rotating wheel disc to slow down rotating wheel, due to that friction force would be generated between tire and road called braking force. This braking force is responsible for stopping vehicle body itself.

This force is limited, which equivalent to 90%: 80% of vehicle weight and reduces to 50% or 30% on wet ground.

This force with vehicle inertia force produces momentum on vehicle body, this leads vehicle to make yaw during braking on oil or turn over during tire exploded.

Although modern vehicles include ABS, EBS, and ECS ...etc, the braking force is still equal friction force between tire and road.

Disclosure of Invention

If we assembly four or two jet motors under vehicle floor horizontally, jet force can be generated during emergency brake (Fig.1 ,2).

Adding jet force to conventional braking force will reduce braking distance. (Active safety)

Jet force can absorb majority of vehicle kinetic energy before crash, which could protect cabin from deforming. (Passive safety)

Jet force is not limited where we can control its value by changing velocity or quantity of hot gas flow rate.

Jet brake is safer, where it affects direct on vehicle body, so no braking momentum will be produced. There are different types of fuel can produce hot gas of jet force:

Fjrjsf type is solid fuel such as the fuel uses for rocket motor. But the splid fuel can't control gas flow rate.

Second typ _^ e is compressed air with injected gasoline inside combustion chamber as planes jet engine, where we store the compressed air(Fig.3,4). Assume: .01 kg/cm2

From Isentropic flow table at M= 2:

M* = 1.63 P _e /Po=0.127 TZTo= 0.555 AJA*=1M

To = 576/ 0.555= 10^7 ⁰ K Po = 1.01/0.127= 8.6 Kg/cm ² m ^* exit = (P«dt /R* T _exit )*Vexit *A _exit Kg/Sec

A _exit = 48 cm ² D/jet= 5.5 cm A ^* = 48/1.68= 29 cm

Thrust _total = m ^' _e /g (V _e -V ₁ ) + A ₆ (P _e -P _a ) = 590 Kg _f

Third type is pressurized hot water heated by exhausted gas of I.C.E. at critical point (221 bar/374 °c) to produce hot steam immediately(Fig.5).

The exit velocity of steam can calculate from Ve = 91.5 _\ J Io - Ie m/s Also we can pump hot water at atmosphere pressure inside c.ch. includes special catalyst to separate hydrogen from oxygen generating hot gas.

Forth type (monopropellant) peroxide hydrogen is injected inside jet motor chamber includes silver net as a catalyst to separate oxygen from

hydrogen peroxide generating heat, which heated water to steam (Fig.5).

Fifth type (Bipropellant) consists of peroxide hydrogen with alcohol & water and platinum as activator (Fig.6,7).

H2O2 + (alcohol + water) — EI ►H20+OHeat -wHot steam + O Also we can inject gasoline or liquid nitrogen or liquid hydrogen / liquid oxygen inside simple combustion chamber as (Fig.8).

How the system works: During normal running, pumps (15) (Fig.6) suck liquid fuel from tanks

(2) and deliver it again to same tanks (No load operation). Distronic system (6) detects emergency brake, microprocessor orders direction valves to let fuel deliver to jet motors (1) under pressure.

Hot steam will flow from jet nozzle (4) at very high velocity generating jet force on vehicle body to absorb majority of its kinetic energy.

When microprocessor detects that vehicle completely stopped, direction valves move to no load position again.

Timing of generating hot steam from peroxide hydrogen is about (15 ms).

The total system timing including microprocessor and valves times is about (40 ms), where driver reaction time about (750 ms).

(7cm) diameter of each nozzle, (lOLitter) fuel and (920m/s) as velocity of hot steam /gas is enough to produce (1000 kgf) as jet force.

Brief Description of Drawings

(1) Jet motor.

(2) Propellant store container.

(3) Rotary adjustor to keep jet motor horizontally. (4) Jet Nozzle.

(5) Shuttle.

(6) Distronic system.

(7) Shuttle mechanism.

(8) Shuttle mechanism valve. (9) Injection Fuel system.

(10) High pressurized gas tank.

(11) Regulator valve.

(12) Directional / Non-return valves.

(13) Heat exchanger by exhausted gas. (14) Injection Orifices or nozzle.

(15) Fuel pump.

(16) Catalyst (silver net).

Best Mode for Carrying out the invention

The best mode of this research to apply in all vehicles ranges, which could achieve better active and passive safety by giving vehicle more add in critical status at high speed.

Industrial Applicability

• Manufacture jet motor casing.

• Manufacture silver net and welded it inside casing. • Manufacture nozzle and welded it with casing.

• Manufacture Injection Orifices, then fitted it inside casing. • Assembly jet motor under floor with chassis.

• Assembly stander fuel tank under floor or luggage compartment.

• Assembly stander fuel pump with engine compartment.

• Connect the three parts with stander valves and high pressure tubes.

• Connect the system with Distronic system.

• Test the system on load position.

• Fill the tank with propellant.

• Test the complete system on test road.