DE19633681C2 - Lambda-controlled additional mixture generator for G-Kat retrofitting of internal combustion engines - Google Patents

Description

State of the art

• 1. Lambda controlled air bypass system from the company Paul Wurm, Am Wildbädle 4, 70329 Stuttgart.
• 2. Lambda controls from different manufacturers intervene in existing injection systems.
• 3. Installation of new complete engines in old driving witness (oldtimer) including the catalysts.

State of the art problems

1 .: Reaction only in the "lean" direction by adding air possible.

Re 2: The majority of end-of-life vehicles have carburettors as a mixture generator.

To 3 .: Only makes sense with high-quality "classic cars".

General problems

• - limited market value of end-of-life vehicles,
• - According to studies by TÜV and the like Organizations poorer maintenance of the old vehicles by their owners,
• - planned exhaust gas laws for 2- and 3-wheelers vehicles.

Conclusion

A retrofit kit must therefore

• - be inexpensive and low-maintenance
• - Emergency running properties have around the operating to ensure safety
• - be universally applicable

These problems are addressed by the invention in Connection with a standard catalyst solved.  

Explanations on the status of technology

The retrofit kit consists of a metal supported catalyst, a lambda probe, one electronic control unit and an air Valve. The valve can have an opening cross-section and be set in the clock frequency. Precondition for a perfect function is the previous vote of the existing a mixture generator on a continuous bold characteristic.

The control unit records the engine speed and the state of the escaping exhaust gases and thus the from existing mixture generator generated mixture Status.

By adding filtered air with the help of the air valve between the throttle valve and The combustion chamber becomes a mixture with lambda 1 generated.

DE 195 45 714 A1

This system works according to the same Principle like the Paul Wurm system. Other plants based on this principle The companies provide work: GAT, Gehringer and G + M.

DE 40 01 334 A1

The invention is that at least a connection between the computer and measurement probes of an injection control interrupted becomes. An additional computer determines with the help a lambda sensor to the computer Injection control signal to be conducted with it a mixture with lambda equal to 1 is generated.

DE 39 31 391 C1

This invention regulates the mixture of one Injection engine on lambda equal to 1 by the control pressure of the injection system ver will change.

Note: All variants listed here influence existing mixture formers and are unable to create their own mixture to create.  

Advantage of the invention

Universally applicable because regardless of the previous existing mixture generator.

The environmental impact of producing a New vehicle or an internal combustion engine is higher than the burden of after armor brought to similar emissions End-of-life vehicle.

Another important advantage of the invention is that it is not working properly Mixed bidders through the regulated addition mixture can be compensated. (Aging, poor maintenance of end-of-life vehicles)

Great potential for retrofittable old vehicles testify.  

Explanation of the drawings

Fig.

1 drawing of the control valve

1

casing

2nd

Adjusting screw

3rd

Injector

4

Shut-off valve

Fig.

2 Arrangement of the mixture generator on one Internal combustion engine

Fig.

3 signal flow

Fig.

4 microcomputers

1

Controller

2nd

Watchdog

3rd

Shut-off valve

4

Injector

software

The control program is a spin in the controller number monitoring overrides warm-up, Transitional areas and the shutdown of the Controllers controls. This monitoring switches hysteresis controlled between warming up, transition areas and shutdown back and forth.

Warm up

Switch-on limit is over 950 rev / min corresponds to normal state lambda = 1

Transition area

Switching limit is below 750 rev / min Prevents engine shutdown in cold start after Push mode etc. The PWM signal (pulse width modulation) switches to a medium one Pulse width ratio; corresponds to one constant mixture enrichment.

Shutdown

Switch-off limit is less than 500 rev / min Regulation is started at high speed waste and engine standstill switched off.

The above speed values are dependent from the internal combustion engine and adjustable. The ones listed here apply to VW Beetles with 1.6 l displacement, 37 KW (50 HP).  

Function of the watchdog link

Signals from the controller become dependent from pulses from the controller to the valves passed on or blocked:

A. Program runs perfectly and B. Speed pulses are received episode

Controller gives impulses for functionality from and signals for the valves, watchdog link passes signals for valves

A. or B. not available episode

Watchdog link switches power supply both valves off, d. H. the engine is running again unregulated in the original condition. With that Engine damage due to too rich or too lean Mixture prevented.

Claims (2)

1. Lambda-controlled additional mixture generator for internal combustion engines with carburetor or a spraying system, characterized in that the total mixture is set to the value lambda equal to 1 by means of the additional mixture generator regardless of the existing mixture generator and regardless of its control circuit by adding an additional mixture between throttle valve and combustion chamber. 2. Lambda-controlled additional mixture generator for Internal combustion engines according to claim 1, there characterized in that the mixture former consists of a control valve in which with an adjustable filtered airflow and injected fuel an additional mixture is formed and an electronic rule circle that depends on the Lamda probe voltage, engine speed and the operating condition the injector and that Shut-off valve for emergency operation regulates.