摘要:
This anomaly determination system is provided with an inlet pressure sensor (31) which detects the inlet pressure of a pressure loss unit (26) provided in the fluid passage (25) in a vehicle, an outlet pressure sensor (32) which detects the outlet pressure of the pressure loss unit (26), an atmospheric pressure sensor (33) which detects the atmospheric pressure, which is the pressure outside of the fluid passage (25), and an anomaly determination unit (35) which determines anomalies in the pressure loss unit (26). The anomaly determination unit (35) determines that there is an anomaly in the pressure loss unit (26) if the difference between the inlet and outlet pressure, the difference between the outlet and atmospheric pressure, and the difference between the outside and inlet pressure, detected when the flow rate in the fluid passage (25) is less than the minimum flow rate at which anomalies in the pressure loss unit (26) are detectable, are within an allowable range, and the pressure difference between the inlet pressure and outlet pressure when the flow rate is greater than or equal to the minimum flow rate is within a first pressure loss range.
摘要:
A fault detection device includes a wastegate valve (23), a control unit (31), a working gas amount computation section (35), and a determination section (38). The control unit (31) obtains a rotational speed (NE) of an engine (10), a boost pressure (Pb), and an intake air i temperature (Tin). The working gas amount computation section (35) computes a computed value (Gc) of a mass flow rate of working gas in the engine (10) by using the rotational speed (NE), the boost pressure (Pb), and the intake air temperature (Tin). The determination section (38) determines that the wastegate valve (38) has a fault when the computed value (Gc) is not a normal value (Gs).
摘要:
Based on entry/exit pressures of compressor 2a detected by atmospheric/boost pressure sensors 13 and 14, pressure ratio of compressor is calculated. Based on mass flow rate and entry temperature of intake air 4 detected by intake air flow-rate/temperature sensors 15 and 16 and entry pressure, volumetric flow rate of intake air is calculated in environmental condition at detection time using gas state equation, and is corrected into volumetric flow rate under standard environmental condition thorough multiplication by corrective coefficient based on entry temperature of intake air. Based on corrected value and calculated pressure ratio, rotational frequency of compressor under standard environmental condition is read out in light of operating characteristic diagram for compressor. Read-out rotational frequency is corrected into actual rotational frequency of compressor through multiplication by corrective coefficient based on entry temperature of intake air, which is determined as rotational frequency of turbocharger 2.
摘要:
An absolute value of a deviation of an actual EGR ratio, calculated in a current operational status of an engine 1, from a target EGR ratio set on the basis of current operational status of the engine 1 is acquired and is multiplied by a quotient, as gain, acquired from division of a feedback correction amount of opening degree of an EGR valve 12 by an upper limit of the feedback correction amount to determine normality when an acquired product is close to "0" and determine higher degree of abnormality the further the product is away from "0".
摘要:
This state quantity estimating device is configured to: calculate a total enthalpy, which is the energy imparted to air by an impeller, an adiabatic compression efficiency of a compressor, and a diffuser outlet flow velocity, which is the flow velocity of air at an outlet surface of a diffuser; allocate to internal energy and pressure energy, on the basis of the adiabatic compression efficiency, a value obtained by subtracting kinetic energy based on the diffuser outlet flow velocity from the total enthalpy; calculate a compression temperature, which is the temperature of air flowing into the outlet surface, by means of a calculation formula including as variables the internal energy and an inlet temperature which is the temperature of the air prior to compression by the impeller; and calculate a compression pressure, which is the pressure of air flowing into the outlet surface, by means of a calculation formula including as variables the pressure energy and an inlet pressure which is the pressure of the air prior to compression by the impeller.
摘要:
An anomaly determination unit includes an EGR amount acquisition section configured to acquire an actual amount of an EGR amount, which is a flow rate of EGR gas; an estimation amount computation section configured to compute an estimated amount of the EGR amount based on a working gas pressure, which is a pressure of working gas in which the EGR gas and intake air are mixed, an EGR temperature, which is a temperature of the EGR gas immediately upstream of an EGR valve, an EGR pressure, which is a pressure of the EGR gas immediately upstream of the EGR valve, and an opening degree instruction value for the EGR valve; and a determination section configured to determine the presence or absence of an anomaly in the EGR valve based on the divergence between the actual amount of the EGR amount and the estimated amount.
摘要:
With a precondition that intake temperature on an entry side of an intercooler 6, ambient temperature, EGR gas temperature on an entry side of an EGR cooler 14 and cooling water temperature into the EGR cooler 14 are determined to be normally detected, fault in an intake system is identified by comparing three elements, i.e., intercooler efficiency calculated on the basis of the intake temperature on entry and exit sides of the intercooler 6 and an ambient temperature, EGR cooler efficiency calculated on the basis of EGR gas temperature on entry and exit sides of the EGR cooler 14 and cooling water temperature, and any deviation of a calculated value of the intake temperature at an intake manifold 7 on the basis of a current EGR ratio, EGR gas temperature on the exit side of the EGR cooler 14 and intake temperature on the exit side of the intercooler 6.