HiTechRedNeck73
09-19-2008, 02:34 PM
How they work -Simplified
Titania sensors do NOT have the ability to produce a self-voltage. Instead, the engine ECU supplies a base reference voltage. If the air/fuel ratio is rich, the resistance in the sensor is low. When the fuel mixture is lean, resistance in the sensor is high. The ECU then uses this high or low signal to adjusts the fuel flow through the fuel injectors. The speed with which it can change from reading a rich to lean or lean to rich air/fuel mixture is called its cross count. The higher or faster the cross counts, the better the sensor.
How they work –Simple details
Your engine will produce the greatest power and the fewest emissions when the air/fuel mixture is kept at a ratio of 14.7 to 1. This is referred to as “stoichiometric”. To try to keep the air/fuel mixture at this ratio, the ECU sends a base or reference voltage to power the titania sensor. It then looks for the signal back from the sensor which will be measured by the amount of resistance ranging from a low resistance of 1000 ohms (when the engine air/fuel mixture is too rich) to a high resistance of over 20,000 ohms (when the air/fuel ratio is considered too lean). The ECU reads the resistance voltage being reported from the sensor and makes adjustments to the fuel through the fuel injectors accordingly. Unlike the newer zirconia sensor, the titania sensor does not require outside reference air to do its job, it is a sealed environment sensor
ok, so here is a wiring schematic of what your typical 4-wire sensor does...
http://www.supermotors.net/getfile/672743/fullsize/423.jpg
here is the closeup of the eletro-chemical schematic...
http://www.supermotors.net/getfile/672741/fullsize/306.jpg
here is what it sends back to the ECM (engine computer)...
http://www.supermotors.net/getfile/672740/fullsize/305.jpg
here is what it all looks like to us...
http://www.supermotors.net/getfile/672739/fullsize/304.jpg
basically, it measures the resistance across the ions of oxygen that make it into the sensor, and then uses that resistance to return a voltage (from the ECU reference voltage) back to the ECU for processing... the ECU looks the voltage up in the fuel table, and thinks it knows how much air and fuel went into the engine in the first place... then it adjusts accordingly....
Titania sensors do NOT have the ability to produce a self-voltage. Instead, the engine ECU supplies a base reference voltage. If the air/fuel ratio is rich, the resistance in the sensor is low. When the fuel mixture is lean, resistance in the sensor is high. The ECU then uses this high or low signal to adjusts the fuel flow through the fuel injectors. The speed with which it can change from reading a rich to lean or lean to rich air/fuel mixture is called its cross count. The higher or faster the cross counts, the better the sensor.
How they work –Simple details
Your engine will produce the greatest power and the fewest emissions when the air/fuel mixture is kept at a ratio of 14.7 to 1. This is referred to as “stoichiometric”. To try to keep the air/fuel mixture at this ratio, the ECU sends a base or reference voltage to power the titania sensor. It then looks for the signal back from the sensor which will be measured by the amount of resistance ranging from a low resistance of 1000 ohms (when the engine air/fuel mixture is too rich) to a high resistance of over 20,000 ohms (when the air/fuel ratio is considered too lean). The ECU reads the resistance voltage being reported from the sensor and makes adjustments to the fuel through the fuel injectors accordingly. Unlike the newer zirconia sensor, the titania sensor does not require outside reference air to do its job, it is a sealed environment sensor
ok, so here is a wiring schematic of what your typical 4-wire sensor does...
http://www.supermotors.net/getfile/672743/fullsize/423.jpg
here is the closeup of the eletro-chemical schematic...
http://www.supermotors.net/getfile/672741/fullsize/306.jpg
here is what it sends back to the ECM (engine computer)...
http://www.supermotors.net/getfile/672740/fullsize/305.jpg
here is what it all looks like to us...
http://www.supermotors.net/getfile/672739/fullsize/304.jpg
basically, it measures the resistance across the ions of oxygen that make it into the sensor, and then uses that resistance to return a voltage (from the ECU reference voltage) back to the ECU for processing... the ECU looks the voltage up in the fuel table, and thinks it knows how much air and fuel went into the engine in the first place... then it adjusts accordingly....