Emulator of lambda probe and MAF SK-04
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- Emulator of lambda probe and MAF
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Emulator lambda probe and MAF SK-04 is designed to recreate (emulate) the signals of lambda probes and any analog signal in the range 0 ... 5V. It is possible to correct the mixture in certain modes of the motor using a computer.
Reconstruction of the signal zirconium lambda probe is performed by analyzing the signals from the mass flow sensor (MAF) and the fuel injector, and then comparing them with the table. The base table is written by the manufacturer or during the self-learning process of the emulator (Figure 2). Using the emulator's capabilities, the fuel mixture can be corrected. As agreed, emulators can be supplied for a titanium lambda probe with a signal of 0 ... 5 Volts.
It is possible to switch the emulation tables of the lambda probe using an external switch. This is necessary, for example, when switching to a power or economy mode, propane or gasoline (for HBO).
The analog signal is reconstructed in accordance with a 3-dimensional map. The table (map) lists the voltage values at the output of the emulator, which are tied to the frequency of rotation, the injection time or the air flow. This function can be used to emulate the sensor's MAF (MFR) signal even if it is not present. This approach allows you to get rid of this sensor. The MAF signal can be converted by converting the signal from the MAP, which is installed if necessary (the price of the MAP sensor from the Daewoo Lanos car is about $ 25).
Emulator SK-04 is equipped with software that allows you to connect it to a computer, read and write all parameters in real time, read fuel consumption, make adjustments without stopping the engine. Provides data for graphics. It is possible to save and record signal emulation tables (Figure 1). Due to the fact that it is possible to adjust the tables, it is possible to correct the fuel mixture separately at different operating modes of the motor.
The device can operate with MAF, having both an analog output and a pulse output.
Figure 1. Write the parameters of the time injector.
The lambda emulator and MAF program can output (as a graph) to the monitor screen and save the following parameters to the file:
Frequency of rotation, injection time, voltage from MAF (readings MAP are recalculated in relative amount of air), voltage from lambda, fuel consumption is instantaneous and general.
Figure 2. The curve of the lambda probe emulator (oxygen sensor).
This chart with the table determines the ratio of fuel and air to emulate the lambda signal. If an absolute pressure sensor (MAP) is used, the voltage from it is converted into a relative air flow rate.
If a mass air flow (MAF) sensor is used, the current fuel quantity is compared with the voltage from the DMRV.
Figure 3. Emulation of the analog signal MAF according to the 3-D table.
The output signal is formed on the basis of:
1. Frequency of rotation of a cranked shaft;
2. You can choose one of the following:
a) Input voltage;
b) Estimated air flow (calculated based on the rotational speed and the readings of the external MAP sensor);
d) Time of injection of fuel
Figure 4. Emulation of the analog signal MAF on a 2-dimensional table.
The output signal is generated based on the estimated airflow or voltage at the emulator input. You can also specify that the signal would be generated based on fuel consumption.
What does the emulator provide?
- Allows to get rid of zirconium or titanium lambda probe
- It allows to replace the standard air flow sensor (MAF sensor) with a cheap absolute pressure sensor (MAP - $ 25)
- Ability to obtain fuel savings or power increase with appropriate adjustment of the fuel mixture
- Receive from the table any signal with a level from 0 to 5V, which can be used for almost any purpose.