UEGO control circuit board portion with ASIC
First Claim
1. A UEGO sensor control circuit package for a UEGO sensor comprises:
- a sensor interface for at least one sensor;
an ASIC coupled to the sensor interface and internally comprising a proportional-integral-derivative (P-I-D) control for at least one sensor, a SPI communications control for communicating with an engine control module, a heater control, a power supply voltage generator, sensing cell drivers delivering a pumping current in response to said P-I-D control, and output buffers for replicating said pumping current from each sensor; and
an output receiving said replications of said pumping current and converting it to an input for said engine control module, said output including a clamp for limiting maximum voltage applied to said engine control module.
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Accused Products
Abstract
A method and apparatus for controlling universal exhaust gas oxygen (UEGO) sensors comprises an application specific integrated circuit (ASIC) that includes a sensor control utilizing proportional-integral-derivative control loop, sensor drivers for generating pumping currents that reflect the changes of voltages representative of oxygen levels in the reference and test chambers of the UEGO sensor, a communication circuit for communicating with an engine control module, and output buffers for conditioning replications of the pumping current for delivery to an output circuit. In addition to the ASIC, a sensor interface conditions the sensor signals and an output circuit transforms the pumping circuit replications to compatible inputs for the engine control module. Preferably, all of the circuits are formed on a portion of a circuit board in the engine control module. A trim compensation circuit compensates for sensor deviation from an ideal performance standard. The output circuit clamps the voltage range to avoid undesirable inputs to the engine control module.
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Citations
21 Claims
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1. A UEGO sensor control circuit package for a UEGO sensor comprises:
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a sensor interface for at least one sensor;
an ASIC coupled to the sensor interface and internally comprising a proportional-integral-derivative (P-I-D) control for at least one sensor, a SPI communications control for communicating with an engine control module, a heater control, a power supply voltage generator, sensing cell drivers delivering a pumping current in response to said P-I-D control, and output buffers for replicating said pumping current from each sensor; and
an output receiving said replications of said pumping current and converting it to an input for said engine control module, said output including a clamp for limiting maximum voltage applied to said engine control module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A UEGO sensor control circuit package for operating an engine control module in response to sensor outputs, the control circuit package comprising:
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a sensor interface for two UEGO sensors;
an ASIC internally comprising a proportional-integral-derivative control for said two sensors, an SPI communications control for communicating with said engine control module, a heater control, a power supply voltage generator, and output buffers for replicating a pumping current for each UEGO sensor;
an output receiving said replications of said pumping current and converting it to an input for said engine control module; and
wherein said interface, said ASIC and said output are mounted on a portion of a circuit board contained in said engine control module. - View Dependent Claims (13, 14, 15)
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16. A method for installing a universal exhaust gas oxygen sensor control circuit in a motor vehicle with an engine having exhaust gases in contact with at least one universal exhaust gas oxygen sensor comprising:
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packing a plurality of circuits in a special application integrated circuit including a proportional-integral-derivative control, a communications control for communicating with an engine control module processor, and output buffers for replicating a pumping current at each sensor;
interfacing said specific application integrated circuit with each said sensor through a signal conditioning circuit; and
coupling said buffers to a converting circuit for generating a fixed range output voltage through a clamping circuit for limiting maximum voltage input to said engine control module. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification