Aged exhaust gas oxygen sensor simulator
First Claim
1. An aged exhaust gas oxygen sensor simulator for inserting between an exhaust gas oxygen sensor and an electronic control module for testing the response of fuel control and emission systems to various levels of exhaust gas oxygen sensor degrading, comprising:
- input means for receiving a sensor signal from said exhaust gas oxygen sensor;
a summing amplifier adding said sensor signal and a delay signal and producing a summed signal at its outputa variable gain inverter having an inverting input, a noninverting input and an output;
a first control means connecting said summing amplifier output to said variable gain inverter inverting input for simulating a rich to lean transitiona second control means connecting said summing amplifier output to said variable gain inverter input for simulating a lean to rich transition; and
an integrator receiving said variable gain inverter output and delivering said delay signal to said summing amplifier and said electronic control module.
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Accused Products
Abstract
An aged exhaust gas oxygen sensor (EGO) simulator is inserted between an exhaust gas oxygen sensor and an electronic control module for testing the response of fuel control and emission systems to various amounts of exhaust gas oxygen sensor aging/degrading. The sensor signal is input to a summing amplifier where a delay signal is added. Positive and negative summing amplifier outputs go through vernier and decade controls, which add delay, and then to a variable gain inverter. The difference signal is integrated and output to the summing amplifier as the delay signal and output to a ground offset control for shifting the waveform up and down before going out to the control module. The vernier and decade controls add delays to mimic an aged/degraded exhaust gas oxygen sensor.
25 Citations
16 Claims
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1. An aged exhaust gas oxygen sensor simulator for inserting between an exhaust gas oxygen sensor and an electronic control module for testing the response of fuel control and emission systems to various levels of exhaust gas oxygen sensor degrading, comprising:
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input means for receiving a sensor signal from said exhaust gas oxygen sensor; a summing amplifier adding said sensor signal and a delay signal and producing a summed signal at its output a variable gain inverter having an inverting input, a noninverting input and an output; a first control means connecting said summing amplifier output to said variable gain inverter inverting input for simulating a rich to lean transition a second control means connecting said summing amplifier output to said variable gain inverter input for simulating a lean to rich transition; and an integrator receiving said variable gain inverter output and delivering said delay signal to said summing amplifier and said electronic control module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for simulating characteristics of a degraded exhaust gas oxygen sensor (EGO) for testing the response of fuel control and emission systems to various levels of EGO degrading, said EGO producing a sensor signal having lean-to-rich and rich-to-lean response rates, said device comprising:
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input means for matching impedances of said EGO and said device and preventing distortion of said sensor signal, said input means outputting a conditioned sensor signal; first means for adding said conditioned sensor signal and a delay signal and producing a summed signal; a variable gain inverter having an inverting input and an output; a first control means coupling said summed signal from said adding means to said inverting input of said variable gain inverter for adjusting said lean-to-rich and rich-to-lean response rates; a second control means connected to said adding means and said first control means for adjusting said lean-to-rich and rich-to-lean response rates; and an integrator connected to said output of said variable gain inverter and outputting said delay signal having lean-to-rich and rich-to-lean response rates simulating characteristics of a degraded EGO. - View Dependent Claims (14, 15, 16)
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Specification