# US 2013/0158833 A1 · Sensors bias detection for electronic returnless fuel system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158833 A1 - Document ID: US20130158833A1 - Status: Published application - Kind: A1 - Application number: 13/326,385 - Filed: 2011-12-15 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: GM Global Technology Operations LLC - Inventors: YOUSSEF A. GHONEIM; MARK N. HOWELL - Web page: https://patentgrep.com/patent/US20130158833A1 ## CPC - F02D 41/222: {relating to the failure of sensors or parameter detection devices} - F02D 41/3082: {Control of electrical fuel pumps} - F02D 41/3809: {Common rail control systems (common rail apparatus F02M55/025, F02M63/0225)} - F02D 2041/2027: {Control of the current by pulse width modulation or duty cycle control} - F02D 2041/223: {Diagnosis of fuel pressure sensors} - F02D 2041/224: {Diagnosis of the fuel system} - F02D 2200/0602: Fuel pressure - F02D 2200/0604: Estimation of fuel pressure - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) ## Abstract A method for isolating an actual sensor bias in a fuel delivery system having a fuel pump includes monitoring first, second and third fuel pump parameters, detecting first and second fuel pump sensor biases based on the monitored first, second and third fuel pump parameters, modeling a fourth fuel pump modeled parameter based on the monitored second and third fuel pump parameters, and isolating the actual sensor bias in one of the detected first and second fuel pump biases based on the monitored third fuel pump parameter and the modeled fourth fuel pump modeled parameter. ## Claims ### Claim 1 Method for isolating an actual sensor bias in a fuel delivery system having a fuel pump comprising: monitoring first, second and third fuel pump parameters; detecting first and second fuel pump sensor biases based on the monitored first, second and third fuel pump parameters; modeling a fourth fuel pump modeled parameter based on the monitored second and third fuel pump parameters; and isolating the actual sensor bias in one of the detected first and second fuel pump biases based on the monitored third fuel pump parameter and the modeled fourth fuel pump modeled parameter. ### Claim 2 (depends on 1) The method of claim 1 wherein the monitored first fuel pump parameter comprises a pump current measured by a current sensor; the monitored second fuel pump parameter comprises a pump pressure measured by a pressure sensor; the detected first fuel pump sensor bias comprises a current sensor bias; and the detected second fuel pump sensor bias comprises a pressure sensor bias. ### Claim 3 (depends on 1) The method of claim 1 wherein the monitored third fuel pump parameter comprises a pump voltage; and the modeled fourth fuel pump modeled parameter comprises a modeled angular pump speed. ### Claim 4 (depends on 3) The method of claim 3 wherein the pump voltage is monitored in response to a pulse width modulation voltage to the fuel pump. ### Claim 5 (depends on 1) The method of claim 1 wherein detecting first and second fuel pump sensor biases based on the monitored first, second and third fuel pump parameters comprises: modeling a first fuel pump modeled parameter based on the monitored second fuel pump parameter and the monitored third fuel pump parameter and modeling a second fuel pump modeled parameter based on the monitored first fuel pump parameter and the monitored third fuel pump parameter; comparing the modeled first fuel pump modeled parameter to the monitored first fuel pump parameter to determine a first fuel pump parameter difference; comparing the modeled second fuel pump modeled parameter to the monitored second fuel pump parameter to determine a second fuel pump difference; detecting the first fuel pump sensor bias when the first fuel pump parameter difference deviates from a first detected bias threshold; and detecting the second fuel pump sensor bias when the second fuel pump parameter difference deviates from a second detected bias threshold. ### Claim 6 (depends on 5) The method of claim 5 further comprising: filtering the first and second fuel pump differences ### Claim 7 (depends on 1) The method of claim 1 wherein isolating the actual sensor bias in one of the detected first and second fuel pump sensor biases comprises isolating a fictitious sensor bias in the other one of the detected first and second fuel pump sensor biases based on the monitored third fuel pump parameter and the modeled fourth fuel pump modeled parameter. ### Claim 8 (depends on 7) The method of claim 7 further comprising: flagging the isolated actual sensor bias in one of the detected first and second fuel pump sensor biases; and resetting the fictitious sensor bias as a non-detected fuel pump sensor bias in the other one of the detected first and second fuel pump sensor biases. ### Claim 9 (depends on 1) The method of claim 1 wherein isolating the actual sensor bias in one of the detected first and second fuel pump sensor biases comprises: determining an unbiased fourth fuel pump parameter based on the monitored third fuel pump parameter; comparing the modeled fourth fuel pump modeled parameter and the unbiased fourth fuel pump parameter; and isolating the actual sensor bias in one of the detected first and second fuel pump sensor biases based on the comparing. ### Claim 10 (depends on 9) The method of claim 9 wherein the unbiased fourth fuel pump parameter comprises an unbiased angular pump speed. ### Claim 11 (depends on 9) The method of claim 9 wherein isolating the actual sensor bias in one of the detected first and second fuel pump sensor biases comprises: determining a difference between the modeled fourth fuel pump modeled parameter and the unbiased fourth fuel pump parameter; and isolating the actual sensor bias in the detected first fuel pump sensor bias when the determined difference is not greater than an actual sensor bias threshold. ### Claim 12 (depends on 9) The method of claim 9 wherein isolating the actual sensor bias in one of the detected first and second fuel pump sensor biases comprises: determining a difference between the modeled fourth fuel pump modeled parameter and the unbiased fourth fuel pump parameter; isolating the actual sensor bias in the detected second fuel pump sensor bias when the determined difference is at least the actual sensor bias threshold plus an absolute value of the detected second fuel pump sensor bias as a function of the third fuel pump parameter. ### Claim 13 (depends on 1) The method of claim 1 wherein the fuel delivery system is an electronic returnless fuel system. ### Claim 14 (depends on 13) The method of claim 13 wherein the electronic returnless fuel system maintains a desired fuel system pressure by applying closed-loop correction derived from the monitored first and second fuel pump parameters as feedback. ### Claim 15 Method for isolating an actual sensor bias in an electronic returnless fuel delivery system having a fuel pump including a pressure sensor and a current sensor comprising: monitoring a pump pressure, a pump current and a pump voltage; detecting biases in the current sensor and the pressure sensor based on the monitored pump pressure, the monitored pump current and the monitored pump voltage; modeling an angular pump speed based on the monitored pump pressure and the monitored pump voltage; determining an unbiased angular pump speed based on the monitored pump voltage, comparing the modeled angular pump speed and the unbiased angular pump speed; determining a change in angular pump speed based on a difference between the modeled angular pump speed and the unbiased angular pump speed; and isolating an actual sensor bias in one of the detected biases in the current sensor and the pressure sensor and isolating a fictitious sensor bias in the other one of the detected biases in the current sensor and the pressure sensor based on the determined change in the angular pump speed. ### Claim 16 (depends on 15) The method of claim 15 wherein isolating the actual sensor bias in one of the detected biases in the current sensor and the pressure sensor and isolating the fictitious sensor bias in the other one of the detected biases in the current sensor and the pressure sensor based on the determined change in angular pump speed, comprises: isolating the actual sensor bias in the detected bias in the current sensor and isolating the fictitious sensor bias in the detected bias in the fuel pump pressure sensor when the determined change in angular pump speed is less than an actual bias sensor threshold. ### Claim 17 (depends on 15) The method of claim 15 wherein isolating the actual sensor bias in one of the detected biases in the current sensor and the pressure sensor and isolating the fictitious sensor bias in the other one of the detected biases in the current sensor and the pressure sensor, comprises: isolating the actual sensor bias in the detected bias in the pressure sensor and isolating the fictitious sensor bias in the detected bias in the current sensor when the determined change in angular pump speed is at least an actual bias sensor threshold plus an absolute value of the detected bias in the fuel pump pressure sensor as a function of the pump voltage. ### Claim 18 (depends on 15) The method of claim 15 wherein the electronic returnless fuel delivery system maintains a desired fuel system pressure by applying closed-loop correction derived from the monitored pump pressure measured by the pressure sensor and the monitored pump current measured by the current sensor as feedback. ### Claim 19 (depends on 15) The method of claim 15 wherein isolating the actual sensor bias in one of the detected biases in current sensor and the pressure sensor and isolating the fictitious sensor bias in the other one of the detected biases in the current sensor and the pressure sensor comprises: flagging the isolated actual sensor bias in one of the detected biases in the current sensor and the pressure sensor; and removing the fictitious sensor bias from a detected bias in the other one of the detected biases in the current sensor and the pressure sensor. ### Claim 20 An apparatus for isolating an actual sensor bias in an electronic returnless fuel delivery system including a first sensor and a second sensor comprising: an internal combustion engine; and an electronic returnless fuel delivery system comprising: a fuel tank; a fuel pump positioned within the fuel tank and supplying fuel from the fuel tank to the engine; and a controller in communication with the fuel pump monitoring first, second and third fuel pump parameters, detecting first and second fuel pump sensor biases based on the monitored first, second and third fuel pump parameters, modeling a fourth fuel pump modeled parameter based on the monitored second and third fuel pump parameters, and isolating the actual sensor bias in one of the detected first and second fuel pump biases based on the monitored third fuel pump parameter and the modeled fourth fuel pump modeled parameter.