Abstract: A communication module includes an input/output switch, a duplexer, a transmit filter, and a receive filter. In the duplexer, a second side is disposed at a position farther from the input/output switch than a first side in a second direction orthogonal to a first direction. Any one of the transmit filter and the receive filter is disposed adjacent to the input/output switch in the first direction.

Abstract: A transmit-and-receive module includes a multiplexer, a power amplifier, and a low-noise amplifier. The multiplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.

Abstract: A duplexer includes first and second filter circuits and first and second wirings. The first filter circuit allows a signal of a first frequency band to pass therethrough between a first terminal and a common terminal and includes a first resonator which is connected at one end to a line disposed between the first terminal and the common terminal to branch off from the line. The second filter circuit allows a signal of a second frequency band, which is different from the first frequency band, to pass therethrough between a second terminal and the common terminal. The first wiring is connected at one end to the common terminal and is opened at the other end. The second wiring is connected at one end to the other end of the first resonator and is grounded at the other end. The first wiring is electromagnetically coupled with second wiring.

Abstract: A duplexer includes first and second filter circuits and first and second wirings. The first filter circuit allows a signal of a first frequency band to pass therethrough between a first terminal and a common terminal and includes a first resonator which is connected at one end to a line disposed between the first terminal and the common terminal to branch off from the line. The second filter circuit allows a signal of a second frequency band, which is different from the first frequency band, to pass therethrough between a second terminal and the common terminal. The first wiring is connected at one end to the common terminal and is opened at the other end. The second wiring is connected at one end to the other end of the first resonator and is grounded at the other end. The first wiring is electromagnetically coupled with second wiring.

Abstract: A duplexer includes first and second filter circuits and first and second wirings. The first filter circuit allows a signal of a first frequency band to pass therethrough between a first terminal and a common terminal and includes a first resonator which is connected at one end to a line disposed between the first terminal and the common terminal to branch off from the line. The second filter circuit allows a signal of a second frequency band, which is different from the first frequency band, to pass therethrough between a second terminal and the common terminal. The first wiring is connected at one end to the common terminal and is opened at the other end. The second wiring is connected at one end to the other end of the first resonator and is grounded at the other end. The first wiring is electromagnetically coupled with second wiring.

Abstract: A ladder filter includes a series arm resonator and parallel arm resonators including a first parallel arm resonator defining a pass band together with the series arm resonator, and a second parallel arm resonator. Each of dimensions, in an overlap width direction, of gap regions between the overlap width region and first and second busbars in the second parallel arm resonator is larger than a dimension, in the overlap width direction, of a gap region in the first parallel arm resonator. A resonant frequency of the second parallel arm resonator is in a frequency range of not lower than a resonant frequency of the series arm resonator.

Abstract: A transmit-and-receive module includes a duplexer, a power amplifier, and a low-noise amplifier. The duplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.

Abstract: A transmit-and-receive module includes a duplexer, a power amplifier, and a low-noise amplifier. The duplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.

Abstract: A transmit-and-receive module includes a duplexer, a power amplifier, and a low-noise amplifier. The duplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.

Abstract: A control device for a diesel engine includes a variable geometry supercharger with a variable supercharge pressure mechanism and an EGR valve configured to adjust an EGR gas amount. In the control device, when the diesel engine is determined to be accelerating, a maximum exhaust pressure is set such that an increased amount of an engine torque by increasing a fuel injection amount in association with acceleration is greater than an increased amount of pumping loss increased with increasing exhaust pressure due to an actuation of the variable supercharge pressure mechanism in association with acceleration. A target control variable for the variable supercharge pressure mechanism and a target control variable for the EGR valve are controlled on the basis of the maximum exhaust pressure.

Abstract: A transmit-and-receive module includes a duplexer, a power amplifier, and a low-noise amplifier. The duplexer includes a transmit filter and a receive filter. The power amplifier and the low-noise amplifier are integrated with each other. In a Smith chart, impedance in a receive band of the receive filter seen from a receive terminal intersects a line connecting a center point of noise figure circles and a center point of gain circles. The center point of the noise figure circles represents the impedance at which the noise figure of the low-noise amplifier is minimized. The center point of the gain circles represents the impedance at which the gain of the low-noise amplifier is maximized.

Abstract: A ladder filter includes a series arm resonator and parallel arm resonators including a first parallel arm resonator defining a pass band together with the series arm resonator, and a second parallel arm resonator. Each of dimensions, in an overlap width direction, of gap regions between the overlap width region and first and second busbars in the second parallel arm resonator is larger than a dimension, in the overlap width direction, of a gap region in the first parallel arm resonator. A resonant frequency of the second parallel arm resonator is in a frequency range of not lower than a resonant frequency of the series arm resonator.

Abstract: A control device for a diesel engine includes a variable geometry supercharger with a variable supercharge pressure mechanism and an EGR valve configured to adjust an EGR gas amount. In the control device, when the diesel engine is determined to be accelerating, a maximum exhaust pressure is set such that an increased amount of an engine torque by increasing a fuel injection amount in association with acceleration is greater than an increased amount of pumping loss increased with increasing exhaust pressure due to an actuation of the variable supercharge pressure mechanism in association with acceleration. A target control variable for the variable supercharge pressure mechanism and a target control variable for the EGR valve are controlled on the basis of the maximum exhaust pressure.

Abstract: In an engine (10) comprising a fuel injector (12) which performs a post injection after performing a main injection into a cylinder and an exhaust valve (15) which opens and closes to discharge an exhaust gas, a controller (70) controls the fuel injector (12) to start the post injection during a period where a gas velocity in the cylinder along a cylinder axis increases after the exhaust valve (15) opens. A duration (t) of the post injection is controlled according to a crank angle at which the post injection is to be performed such that a breakup distance (L) at the end of which the injected fuel atomizes does not become larger than a distance (S) from an injection hole (12a) to a cylinder liner (10c), thereby ensuring that the injected fuel is supplied to an exhaust passage (23) without adhering to the cylinder liner (10c).

Abstract: To prevent an increase in torque when the fixed state of a throttle valve is released. When diagnostics reads fixed diagnostics flag 1 indicating that the throttle valve is in a fixed state, control value ATVO that can maintain throttle aperture RTVO is set (S11, S12) based on detected value RTVO for the throttle aperture in the current fixed state, fuel injection volume TiO that is calculated according to new air volume Q is secured at fuel injection volume TiL or greater in order to achieve the engine torque for when fail-safe control is executed, and when air-fuel ratio?is less than the lower limit value?L, causing an increase in the amount of smoke, control is executed to suppress the occurrence of said smoke.

Abstract: A particulate accumulation amount estimating system is configured to accurately estimate an amount of particulate matter accumulated in a particulate filter based on the pressure difference across the particulate filter even when ash is accumulated in the particulate filter. The particulate accumulation amount estimating system is configured to estimate a particulate accumulation amount of particulate matter accumulated in the particulate filter based on a pressure difference that was detected across the particulate filter and an effective area change of the particulate filter that was detected due to the accumulation of ash in the particulate filter. The estimate of the particulate accumulation amount based on the pressure difference across the filter will be lower as the estimate value of the ash accumulation amount becomes larger.

Abstract: To prevent an increase in torque when the fixed state of a throttle valve is released. When diagnostics reads fixed diagnostics flag 1 indicating that the throttle valve is in a fixed state, control value ATVO that can maintain throttle aperture RTVO is set (S 11, S 12) based on detected value RTVO for the throttle aperture in the current fixed state, fuel injection volume TiO that is calculated according to new air volume Q is secured at fuel injection volume TiL or greater in order to achieve the engine torque for when fail-safe control is executed, and when air-fuel ratio), is less than the lower limit valueXL, causing an increase in the amount of smoke, control is executed to suppress the occurrence of said smoke.

Abstract: In an engine (10) comprising a fuel injector (12) which performs a post injection after performing a main injection into a cylinder and an exhaust valve (15) which opens and closes to discharge an exhaust gas, a controller (70) controls the fuel injector (12) to start the post injection during a period where a gas velocity in the cylinder along a cylinder axis increases after the exhaust valve (15) opens. A duration (t) of the post injection is controlled according to a crank angle at which the post injection is to be performed such that a breakup distance (L) at the end of which the injected fuel atomizes does not become larger than a distance (S) from an injection hole (12a) to a cylinder liner (10c), thereby ensuring that the injected fuel is supplied to an exhaust passage (23) without adhering to the cylinder liner (10c).

Abstract: This is a method for regenerating the NOx catalyst in a NOx purifying system provided in the exhaust passage with a direct reduction type NOx catalyst which directly decomposes the NOx during lean-condition operation and is regenerated at rich-condition operation, and the method prohibiting the rich-condition control when the temperature detected by a catalyst temperature detecting means is within the predetermined temperature range. Thus, when the exhaust gas are temporarily made rich-condition for catalyst regeneration which means recovering the NOx purifying ability of the direct reduction type NOx catalyst arranged in the exhaust passage of the engine, the NOx is prohibited from being discharged into the atmospheric air, and also the purifying ability can surely be recovered.

Abstract: A particulate accumulation amount estimating system is configured to accurately estimate an amount of particulate matter accumulated in a particulate filter based on the pressure difference across the particulate filter even when ash is accumulated in the particulate filter. The particulate accumulation amount estimating system is configured to estimate a particulate accumulation amount of particulate matter accumulated in the particulate filter based on a pressure difference that was detected across the particulate filter and an effective area change of the particulate filter that was detected due to the accumulation of ash in the particulate filter. The estimate of the particulate accumulation amount based on the pressure difference across the filter will be lower as the estimate value of the ash accumulation amount becomes larger.