Method for monitoring a pressure sensor in a direct injection system
AssigneesContinental Automotive France, Continental Automotive GmbH
InventorsYves Agnus, Nicolas Girard, Tet Kong Brian Chia
Life of this patent
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Abstract
A method for monitoring a pressure sensor in a direct injection system including at least one common rail, a high-pressure fuel pump, a hydraulic circuit connecting the high-pressure pump to the common rail, a passive pressure-limiting valve connected to the hydraulic circuit, configured to open once the pressure in the hydraulic circuit is greater than a threshold pressure, so as to discharge the fuel, including the steps of detecting the opening of the pressure-limiting valve, measuring the pressure PMES corresponding to the time of opening of the pressure-limiting valve and comparing the measured pressure PMES to the threshold pressure P1 in order to detect a drift in the pressure sensor.
Claims8
A method for monitoring a pressure sensor in a direct injection system comprising at least one common rail, a pressure sensor configured to measure a pressure PMES in the common rail, a high-pressure fuel pump comprising a high-pressure piston and a flow control valve having electrical control, a hydraulic circuit connecting the high-pressure pump to the common rail, a control unit configured to control the flow control valve so that the pressure PMES in the common rail is equal to a setpoint pressure, a passive pressure-limiting valve connected to the hydraulic circuit, configured to open once the pressure in the hydraulic circuit is greater than a threshold pressure P1, so as to discharge the fuel, the method comprising the following steps implemented in the control unit:
- a) detecting the opening of the pressure-limiting valve;
- b) measuring the pressure PMES corresponding to a time of opening of the pressure-limiting valve;
- and
- c) comparing the measured pressure PMES to the threshold pressure P1 in order to detect a drift in said pressure sensor.
A direct injection system, comprising at least one common rail, a pressure sensor configured to measure the pressure PMES in the common rail, a high-pressure fuel pump comprising a high-pressure piston and a flow control valve having electrical control, a hydraulic circuit connecting the high-pressure pump to the common rail, a control unit configured to control the flow control valve so that the pressure PMES in the common rail is equal to a setpoint pressure, a passive pressure-limiting valve connected to the hydraulic circuit, configured to open once the pressure in the hydraulic circuit is greater than a threshold pressure P1, so as to discharge the fuel, the method comprising the following steps implemented in the control unit, wherein the control unit is configured to detect the opening of the pressure-limiting valve, to measure the corresponding pressure PMES at the time of opening the pressure-limiting valve and to compare the measured pressure PMES to the threshold pressure P1, in order to detect a drift in said pressure sensor.
Dependencies are inferred from the claim text.