Diagnostic system for internal combustion engine
AssigneeHitachi, Ltd.
InventorMasahiko Wakairo
Life of this patent
Estimating the term…
Abstract
A diagnostic system for an internal combustion engine including a plurality of cylinder banks. The system includes a throttle position sensor mounted in each of the cylinder banks, for detecting a throttle opening of a throttle valve of an associated one of the cylinder banks. The throttle openings of the cylinder banks are controlled in accordance with a common target. An ECU makes a check to determine whether the detected throttle openings are same. The ECU determines in accordance with the comparison whether or not there is abnormality in at least one of the throttle valves and the throttle position sensors.
Claims12
A diagnostic system for an internal combustion engine including a plurality of cylinder banks each mounting thereon an actuator for adjusting a common control variable in relation to an associated one of the cylinder banks, the diagnostic system comprising:
- a sensor mounted in each of the cylinder banks, to collect information needed to determine an estimate of the control variable in relation to an associated one of the cylinder banks;
- and
- a control unit configured to be connected electrically to the sensors, and to the actuators, for performing the following:
- controlling the actuators in accordance with a common target for the control variables of the cylinder banks;
- determining the estimates of the control variables;
- comparing the estimates of the control variables with each other;
- and
- determining whether or not there is abnormality in at least one of the sensors and the actuators, in accordance with the comparison of the estimates of the control variables.
A diagnostic system for an internal combustion engine including a plurality of cylinder banks each mounting thereon actuating means for adjusting a common control variable in relation to an associated one of the cylinder banks, the diagnostic system comprising:
- sensing means for being mounted in each of the cylinder banks, to collect information needed to determine an estimate of the control variable in relation to an associated one of the cylinder banks;
- and
- control means for being connected electrically to the sensing means, and to the actuating means, for performing the following:
- controlling the actuating means in accordance with a common target for the control variables of the cylinder banks;
- determining the estimates of the control variables;
- comparing the estimates of the control variables with each other;
- and
- determining whether or not there is abnormality in at least one of the sensing means and the actuating means, in accordance with the comparison of the estimates of the control variables.
A method of controlling a diagnostic system for an internal combustion engine including a plurality of cylinder banks each mounting thereon an actuator for adjusting a common control variable in relation to an associated one of the cylinder banks, the diagnostic system including a sensor mounted in each of the cylinder banks, to collect information needed to determine an estimate of the control variable in relation to an associated one of the cylinder banks, the method comprising:
- controlling the actuators in accordance with a common target for the control variables of the cylinder banks;
- determining the estimates of the control variables;
- comparing the estimates of the control variables with each other;
- and
- determining whether or not there is abnormality in at least one of the sensors and the actuators, in accordance with the comparison of the estimates of the control variables.
Dependencies are inferred from the claim text.