摘要:
In flow detection by a thermal-type flow measuring instrument (1), a flow rate value with reduced measurement error due to temperature variation can be obtained even under environment where a fluid temperature and a circuit temperature are different. A measurement error due to temperature variation of the fluid of the thermal-type flow measuring instrument (1) can be corrected on the basis of a temperature of the fluid by adjusting the measurement error to be constant ratio irrespective of the flow rate. On the other hand, a temperature characteristic of the circuit is adjusted to be substantially zero %.
摘要:
In flow detection by a thermal-type flow measuring instrument (1), a flow rate value with reduced measurement error due to temperature variation can be obtained even under environment where a fluid temperature and a circuit temperature are different. A measurement error due to temperature variation of the fluid of the thermal-type flow measuring instrument (1) can be corrected on the basis of a temperature of the fluid by adjusting the measurement error to be constant ratio irrespective of the flow rate. On the other hand, a temperature characteristic of the circuit is adjusted to be substantially zero %.
摘要:
Disclosed is a method and apparatus for controlling a throttle valve (8) driven by a D.C. motor (3) in an internal combustion engine (1), in which the D.C. motor (3) is driven until a valve position sensor (4) detecting the angular position of the throttle valve generates an output signal which coincides with the output signal of an accelerator pedal sensor (6) detecting the amount of depression of an accelerator pedal of a vehicle. The value (i₁) of motor current required for causing very slight displacement of a return spring (12) provided for returning the throttle valve toward a predetermined angular position is utilized for automatically compensating various factors of fluctuation attributable to friction, inertia, etc. of means (10, 12) driving the throttle valve. A small-capacity microprocessor is used to control the D.C. motor so that the throttle valve can operate with high accuracy and high-speed response capability without being adversely affected by changes in the operating condition as well as secular variations.
摘要:
In a heating resistor type air flow measurement apparatus, a flow correction data is read out from a primary memory and stored in a secondary memory, and then an air flow signal is calibrated by the flow correction data stored in the secondary memory, when starting the apparatus up. The apparatus has a diagnosis unit (33) for determining whether or not the flow correction data stored in the primary memory is correct, wherein the determination processing of the flow correction data by the diagnosis unit (33) is performed at during any time at least including the starting-up point of the apparatus. There is no fear that the engine control based on the abnormal flow correction data continues.
摘要:
By employing command value signals for controlling the opening timing of an exhaust valve (11) or an intake valve (10) and means (20) for measuring flow rates of an intake air of a flow direction which flows through an intake manifold (19) of an internal combustion engine (1), an air flow rate corresponding to the command value signal is measured. A valve mechanism (40, 41) includes the intake valve (10) and the exhaust valve (11) for each cylinder (1a) of the internal combustion engine (1) and is controlled by a valve control means (30) for controlling the valve mechanism (40, 41). A failure diagnosis of an operating status of the valve mechanism (40, 41) can be performed.
摘要:
In a heating resistor type air flow measurement apparatus, a flow correction data is read out from a primary memory and stored in a secondary memory, and then an air flow signal is calibrated by the flow correction data stored in the secondary memory, when starting the apparatus up. The apparatus has a diagnosis unit (33) for determining whether or not the flow correction data stored in the primary memory is correct, wherein the determination processing of the flow correction data by the diagnosis unit (33) is performed at during any time at least including the starting-up point of the apparatus. There is no fear that the engine control based on the abnormal flow correction data continues.
摘要:
Disclosed is a method and apparatus for controlling a throttle valve (8) driven by a D.C. motor (3) in an internal combustion engine (1), in which the D.C. motor (3) is driven until a valve position sensor (4) detecting the angular position of the throttle valve generates an output signal which coincides with the output signal of an accelerator pedal sensor (6) detecting the amount of depression of an accelerator pedal of a vehicle. The value (i₁) of motor current required for causing very slight displacement of a return spring (12) provided for returning the throttle valve toward a predetermined angular position is utilized for automatically compensating various factors of fluctuation attributable to friction, inertia, etc. of means (10, 12) driving the throttle valve. A small-capacity microprocessor is used to control the D.C. motor so that the throttle valve can operate with high accuracy and high-speed response capability without being adversely affected by changes in the operating condition as well as secular variations.
摘要:
By employing command value signals for controlling the opening timing of an exhaust valve (11) or an intake valve (10) and means (20) for measuring flow rates of an intake air of a flow direction which flows through an intake manifold (19) of an internal combustion engine (1), an air flow rate corresponding to the command value signal is measured. A valve mechanism (40, 41) includes the intake valve (10) and the exhaust valve (11) for each cylinder (1a) of the internal combustion engine (1) and is controlled by a valve control means (30) for controlling the valve mechanism (40, 41). A failure diagnosis of an operating status of the valve mechanism (40, 41) can be performed.