Abstract: A desired wastegate valve opening degree is set in accordance with a driving condition of an internal combustion engine; based on a detected rotation speed of the internal combustion engine and a set desired wastegate valve opening degree. An ECU determines whether or not supercharging air to the internal combustion engine is required. If the supercharging air is not required and if the opening degree of the wastegate valve becomes a desired valve, a driving current supplied to the wastegate actuator from a wastegate valve driving unit is stopped.

Abstract: Provided are a control device and a control method for an internal combustion engine, which enable a throttle-valve upstream pressure through simple calculation processing without being affected by a state of an opening degree of a wastegate valve (WGV). When a wastegate (WG) command value to a WGV driving section (212) for driving a WGV (33a) provided in a bypass passage (33) which bypasses a turbocharger (32) is to control supercharging to be weakened to the lowest level, the throttle-valve upstream pressure is estimated from an exhaust-gas amount. Otherwise, a value obtained by adding a preset value to an intake-manifold pressure is used as a throttle-valve upstream pressure estimate value. As a result, the throttle-valve upstream pressure is estimated with high accuracy by an inexpensive configuration without mounting a throttle-valve upstream pressure sensor, and then engine control is performed.

Abstract: In the control device, a relationship of a throttle-upstream pressure with respect to an exhaust-gas amount is used in a state where a supercharge pressure becomes the lowest by a WG-instruction value with respect to a WGV-control component 220 for driving a WGV 33a provided at a bypass passage 33 bypassing a turbocharger 32, and a relationship of a throttle-upstream pressure with respect to an aperture of a throttle valve 23, a rotational speed of an engine, and an intake-manifold pressure is used, and any of the throttle-upstream pressures, whichever is higher, being calculated in accordance with each of the relationship, is defined as a throttle-upstream-estimation value, whereby the throttle-upstream pressure is estimated by a cheap means with high accuracy so as to control the engine.

Abstract: Provided are a wastegate valve control device for an internal combustion engine and a wastegate valve control method for an internal combustion engine, which are capable of controlling a wastegate valve (WGV) to a desired open/closed state at low cost even when a reference position of the WGV is shifted from a full-closure position of the WGV. When a target WGV opening (control target value) is equal to or smaller than a threshold opening, a given opening is added to or subtracted from the target WGV opening while the WGV is controlled to perform an opening/closing operation based on the target WGV opening. By monitoring a change in throttle upstream pressure or driving current of a WGV actuator, an optimal target WGV opening corresponding to the shift of the reference position with respect to the full-closure position of the WGV is determined.

Abstract: Provided is a control device for an internal combustion engine, which improves acceleration performance while maintaining fuel performance in a non-supercharging operation range. A bypass passage (33) which bypasses a turbine (32c, 32d) of a supercharger is provided. In the bypass passage (33), a wastegate valve (33a) for adjusting a flow-path area of the bypass passage (33) by a wastegate actuator (33b) is provided. For an operation in the non-supercharging operation range, an opening degree of the wastegate valve (33a) is set to fully close the wastegate valve (33a) when a ratio of a pressure (Pb) of an intake manifold (22) and an atmospheric pressure (P1) is smaller than a threshold value.

Abstract: Provided are a control device and a control method for an internal combustion engine, which enable a throttle-valve upstream pressure through simple calculation processing without being affected by a state of an opening degree of a wastegate valve (WGV). When a wastegate (WG) command value to a WGV driving section (212) for driving a WGV (33a) provided in a bypass passage (33) which bypasses a turbocharger (32) is to control supercharging to be weakened to the lowest level, the throttle-valve upstream pressure is estimated from an exhaust-gas amount. Otherwise, a value obtained by adding a preset value to an intake-manifold pressure is used as a throttle-valve upstream pressure estimate value. As a result, the throttle-valve upstream pressure is estimated with high accuracy by an inexpensive configuration without mounting a throttle-valve upstream pressure sensor, and then engine control is performed.

Abstract: Provided are a wastegate valve control device for an internal combustion engine and a wastegate valve control method for an internal combustion engine, which are capable of controlling a wastegate valve (WGV) to a desired open/closed state at low cost even when a reference position of the WGV is shifted from a full-closure position of the WGV. When a target WGV opening (control target value) is equal to or smaller than a threshold opening, a given opening is added to or subtracted from the target WGV opening while the WGV is controlled to perform an opening/closing operation based on the target WGV opening. By monitoring a change in throttle upstream pressure or driving current of a WGV actuator, an optimal target WGV opening corresponding to the shift of the reference position with respect to the full-closure position of the WGV is determined.

Abstract: In a turbocharged internal combustion engine, an amount of cylinder suction air is calculated with sufficiently high accuracy to suitably control the internal combustion engine in consideration of influences of an exhaust pressure on a volumetric efficiency equivalent value without requiring a huge memory capacity, in fewer adaptive man hours, and under a low operation load. A correction calculation parameter is calculated using an exhaust pressure, an exhaust pressure for pre-correction volumetric efficiency equivalent value, and an intake manifold pressure, and a post-corrected volumetric efficiency equivalent value is calculated by correcting a pre-correction volumetric efficiency equivalent value using the correction calculation parameter. An amount of air entering a cylinder from an intake manifold is calculated on the basis of the post-correction volumetric efficiency equivalent value.

Abstract: Provided is a control device for an internal combustion engine, which improves acceleration performance while maintaining fuel performance in a non-supercharging operation range. A bypass passage (33) which bypasses a turbine (32c, 32d) of a supercharger is provided. In the bypass passage (33), a wastegate valve (33a) for adjusting a flow-path area of the bypass passage (33) by a wastegate actuator (33b) is provided. For an operation in the non-supercharging operation range, an opening degree of the wastegate valve (33a) is set to fully close the wastegate valve (33a) when a ratio of a pressure (Pb) of an intake manifold (22) and an atmospheric pressure (P1) is smaller than a threshold value.

Abstract: A desired wastegate valve opening degree is set in accordance with a driving condition of an internal combustion engine; based on a detected rotation speed of the internal combustion engine and a set desired wastegate valve opening degree, it is determined whether or not supercharging for the internal combustion engine is required; and in the case where it is determined that the supercharging is not required, a driving current for a wastegate valve driving unit is stopped when the opening degree of the wastegate valve becomes a desired value.

Abstract: Respective positive terminal electric potentials of exhaust gas sensors are sequentially selectively inputted to an analog input terminal of a multi-channel AD converter through a multiplexer. An offset voltage is applied to respective negative terminals of the exhaust gas sensors. This offset voltage is inputted to another input terminal of the multi-channel AD converter. A microprocessor detects a generating voltage of the exhaust gas sensors by the difference between a digital converting value of the positive terminal electric potential and a digital converting value of the negative terminal electric potential. The microprocessor also individually judges that each of the digital converting values is excessively small and excessively large. Thus, the microprocessor judges the existence of ground, sky short circuit and disconnection abnormalities of the negative terminal and the positive terminal.

Abstract: Respective positive terminal electric potentials of exhaust gas sensors are sequentially selectively inputted to an analog input terminal of a multi-channel AD converter through a multiplexer. An offset voltage is applied to respective negative terminals of the exhaust gas sensors. This offset voltage is inputted to another input terminal of the multi-channel AD converter. A microprocessor detects a generating voltage of the exhaust gas sensors by the difference between a digital converting value of the positive terminal electric potential and a digital converting value of the negative terminal electric potential. The microprocessor also individually judges that each of the digital converting values is excessively small and excessively large. Thus, the microprocessor judges the existence of ground, sky short circuit and disconnection abnormalities of the negative terminal and the positive terminal.

Abstract: An electronic throttle control unit for an engine can perform precise control by using a single inexpensive AD converter. The unit includes an electronic throttle that controls an engine, a throttle opening detection section that detects the throttle opening of the electronic throttle, and a control section that controls the throttle opening to a target value in accordance with an operating condition of the engine. The throttle opening detection section includes a throttle opening sensor that generates a sensor voltage corresponding to the throttle opening, an offset part that converts the sensor voltage into a plurality of voltages with offsets, a distribution circuit for distributing the voltages with offsets to a single path, an AD converter that AD converts the voltages distributed to the single path; and a distribution switching section that performs distribution switching control of the distribution part, wherein the distributed voltages are detected as a final throttle opening to be controlled.