Circuit for determining the internal resistance of a linear lambda probe
AssigneeSiemens Aktiengesellschaft
InventorStephan Bolz
Life of this patent
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Abstract
A device for measuring the probe impedance of a linear lambda probe of an internal combustion engine which is caused by an AC current measurement signal which is fed into the lambda probe, comprises a voltage amplifier for amplifying an AC voltage which drops across the probe impedance, and a rectifier for rectifying the amplified AC voltage, wherein the rectifier is a synchronous demodulator, by which in each case the upper and lower amplitude of the AC voltage signal is sampled with its frequency, filtered and stored, and by which the difference of the stored signals is amplified with a gain factor and made available as output signal at its output for controlling the temperature of the lambda probe.
Claims16
A device for measuring the probe impedance of a linear lambda probe of an internal combustion engine which is caused by an AC current measurement signal which is fed into the lambda probe, comprising
- a voltage amplifier for amplifying an AC voltage which drops across the probe impedance, and
- a rectifier for rectifying the amplified AC voltage, wherein the rectifier is a synchronous demodulator, by which in each case the upper and lower amplitude of the AC voltage signal is sampled with its frequency, filtered and stored, and by which the difference of the stored signals is amplified with a gain factor and made available as output signal at its output for controlling the temperature of the lambda probe.
A method for measuring the probe impedance of a linear lambda probe of an internal combustion engine, comprising the steps of:
- feeding an AC current measurement signal into the lambda probe;
- amplifying an AC voltage which drops across the probe impedance, and
- rectifying the amplified AC voltage by means of a synchronous demodulator, by which in each case the upper and lower amplitude of the AC voltage signal is sampled with its frequency, filtered and stored, and by which the difference of the stored signals is amplified with a gain factor and made available as output signal at its output for controlling the temperature of the lambda probe.
Dependencies are inferred from the claim text.