摘要:
An oxygen sensor control apparatus (10) obtains a correction coefficient for calibrating the relation between oxygen concentration and an output value of an oxygen sensor (20), when a fuel cut operation of an internal combustion engine (100) is performed. The apparatus includes average output value calculation means; inter-fuel-cut average output value calculation means; and correction coefficient calculation means.
摘要:
In an oxygen sensor control apparatus, after start of fuel cut, the weighted average Ipd of corrected values obtained by multiplying the output value of a mounted oxygen sensor by a correction coefficient Kp is obtained as a representative value Ipe, representing the corrected values in the fuel cut period (S19). In the case where the number of times the representative value Ipe is continuously judged not to fall outside a second range (S21: NO) and to fall outside a first range (S23: YES) reaches 10 (a first number of times) (S26: YES), a new correction coefficient Kp is computed (S27). In the case where the number of times the representative value Ipe is continuously judged to fall outside the second range (S21: YES) reaches 4 (a second number of times smaller than the first number of times) (S29: YES), a new correction coefficient Kp is computed (S30).
摘要:
An occupant detection system includes a detection electrode provided in a vehicle seat, a phase difference measuring unit, a direct current measuring unit, and a detecting unit that detects an occupant. The phase difference measuring unit supplies a reference signal comprising a sinusoidal wave to the detection electrode via a resistive element, detects the potential of the detection electrode as an electrode signal, and measures a phase lag time of the electrode signal relative to the reference signal. The direct current measuring unit applies a steady DC voltage to the detection electrode via a resistive element, detects the potential of the detection electrode, and measures time it takes from start of application of the DC voltage to the time when the detection electrode reaches a given potential, as a charge time. The detecting unit detects an occupant based on the phase lag time and the charge time.
摘要:
An occupant detection system includes an electrode provided in a vehicle seat for detecting the capacitance derived from a human body, an oscillator circuit that supplies a sinusoidal signal S0 to the electrode via a resistive element, a first comparator circuit that digitizes the signal S0 using a threshold corresponding to a given phase so as to produce a phase signal D0, a second comparator circuit that detects the potential of the electrode as an electrode signal S1, and digitizes the electrode signal S1 using a threshold corresponding to a phase that is substantially the same as the given phase of the signal S0 so as to produce an electrode phase signal D1, and a control circuit that measures delay times of the electrode phase signal D1 relative to those of the phase signal D0, so as to determine the presence of a seated occupant based on the delay times.
摘要:
A sensor control circuit unit (1) includes a circuit board (70) which has opposite sides (70a) and (70b) facing in parallel with each other, and carries a signal detection circuit (28) for receiving a detection signal whose level is equal to or less than one μA and which changes in accordance with NOX concentration, a power supply circuit (35), and a heater circuit (40) for controlling a heater. The power supply circuit (35) and the heater circuit (40) are mounted on one side of the circuit board (70) toward one side (70a) of the opposite sides, and the signal detection circuit (28) is mounted in a mounting area on the other side of the circuit board (70) toward the other side (70b) of the opposite sides, the mounting area being different from a mounting area of the circuits (35) and (40). A ground conductor (24x) connected to the ground is continuously formed on a surface of the circuit board (70) on which the signal detection circuit (28) is mounted such that the ground conductor (24x) extends along at least the other of the opposite sides.
摘要:
A sensor control device including a circuit board separate from and electrically connectable to a gas sensor, the gas sensor including a detecting element configured to output a concentration response signal in response to the concentration of a specific gas component. The circuit board has mounted thereon: a detecting element driving unit; a temperature sensing element configured to output a temperature response signal in response to a temperature of the circuit board; a temperature calculating unit; and a concentration information correcting unit configured to correct gas concentration information calculated by the detecting element driving unit based on temperature information calculated by the temperature calculating unit.