Abstract:
An object is to enable low fuel-consumption operation of an engine by controlling a back pressure and a power generation amount taking account of a trade-off relationship between deterioration of fuel efficiency due to an increase in pumping loss due to a back-pressure rise of the engine and improvement of fuel efficiency due to recovery of exhaust energy by a turbo compound. A control system includes: a turbocharger 5; a turbine generator 7; a power-generation-amount control unit 51 of the turbine generator 7; a back-pressure control unit 53 configured to control a back pressure of the engine; and a turbo controller 17 including a power-generation-mode setting unit 31 to set the turbine generator to a low fuel-consumption mode, the turbo controller 17 being configured to, in the low fuel-consumption mode, control the power-generation-amount control 51 unit and the back-pressure control unit 53 so that the engine 3 continues low fuel-consumption operation, on the basis of a relationship between an increase in pumping loss due to a back-pressure rise for rotating the turbine generator 7 and a recovery amount of exhaust energy by the turbine generator 7.
Abstract:
The present invention relates to a control device (26) for a turbocharger (17) for supplying compressed intake air to an internal combustion engine (1). The control device includes: a storage part (27) configured to pre-store a map (33); a detection part (28) configured to a characteristic parameter; a calculation part (29) configured to obtain an efficiency η of the turbocharger on the basis of the detected characteristic parameter; a determination part (30) configured to determine presence of deterioration of the turbocharger by comparing the detected characteristic parameter and the obtained efficiency η with the map (33); and an informing part (31) configured to inform a user of a maintenance request.
Abstract:
In an control apparatus of an internal combustion engine, a technique is provided in which a proper amount of EGR gas can be supplied while making narrower a range within which exhaust pulsation propagates. In the control apparatus of an internal combustion engine including an EGR passage (41) that connects between an intake passage (4) and an exhaust passage (8) of the internal combustion engine (1) so as to circulate a part of an exhaust gas from the internal combustion engine (1) as an EGR gas, and an EGR valve (42) that is arranged at a location between opposite ends of the EGR passage (41) so as to adjust a flow rate of the EGR gas by adjusting a passage area of the EGR passage (41), provision is made for an opening and closing device (46) of a normally open type that opens and closes the EGR passage (41) at an upstream side of the EGR valve (42), and a change unit (90) that changes a degree of opening of the opening and closing device (46).
Abstract:
An internal combustion engine control apparatus includes a turbocharger (21), an intake air quantity detecting section, an intake air pressure detecting section, a turbine rotational speed limit determining section and a turbine control section. The turbine rotational speed limit determining section determines a turbine rotational speed limit pressure ratio (Pratio_Comp_limit) between the upstream-side intake air pressure (P_in_Comp) and a downstream-side intake air pressure (P_out_Comp) in the air intake passage (3) at a downstream side of the compressor (23) for a turbine rotational speed limit that corresponds to the intake air quantity (Gair) detected by the intake air quantity detecting section. The turbine rotational speed limit determining section further calculates a turbine over rotation suppressing boost pressure (P_out_Comp_limit) of the turbine compressor (23) using the upstream-side intake air pressure (P_in_Comp) and the turbine rotational speed limit pressure ratio (Pratio_Comp_limit). The turbine control section controls the turbocharger (21) based on the turbine over rotation suppressing boost pressure (P_out_Comp_limit).
Abstract:
A method for controlling an internal combustion engine (1) supercharged by means of a turbocharger (12) provided with a turbine (13) and with a compressor (14); the control method includes the steps of determining a pressure objective downstream of the compressor (14); determining a critical threshold (M critica ) of the reduced mass flow rate (Q AHR ), said critical threshold (M critica ) delimiting, on a reduced mass flow rate/compression ratio plane, a critical area close to the achievement of sonic conditions; and filtering, by means of a first filter, the pressure objective downstream of the compressor (14) when the current reduced mass flow rate (Q AHR ) is higher than the critical threshold (M critica ).
Abstract:
One embodiment may include a method of controlling exhaust gas recirculation (EGR) in a turbocharged compression-ignition engine system including a high pressure (HP) EGR path and a low pressure (LP) EGR path. The method may include determining a target total EGR fraction for compliance with exhaust emissions criteria, and determining a target HP/LP EGR ratio to optimize other engine system criteria within the constraints of the determined target total EGR fraction. The determining of the target HP/LP EGR ratio may include using at least engine speed and load as input to a base model to output a base EGR value, using at least one other engine system parameter as input to at least one adjustment model to output at least one EGR adjustment value, and adjusting the base EGR value with the at least one EGR adjustment value to generate at least one adjusted EGR value.
Abstract:
Device (10) for controlling the speed of a turbosupercharger (7) in an internal-combustion engine comprising: a compressor (9); a turbine (8) for driving the compressor (9) in rotation under the action of the exhaust gases of the engine (2); and a wastegate valve (12) for regulating the flow rate of the exhaust gases at input to the turbine (8) in such a way as to control the speed of rotation thereof; the control device (10) comprising: a calculating unit (15), which receives at input a set of parameters comprising a pre-set limit speed of rotation (N tc ) of the turbosupercharger (7), the air pressure (P AMB ) measured at input to the compressor (9), and the mass flow rate (Q AH ) of the compressor (9), and is designed to process said parameters for determining, through a pre-determined map (15a) that characterizes operation of the compressor (9), a limit supercharging pressure (S P1 ) correlated to the air pressure obtainable at output from the compressor (9) in a condition of rotation of the turbine (8) at a speed substantially equal to the pre-set limit speed of rotation (N tc ); a comparison unit (16) designed to verify whether a required objective supercharging pressure (P OB ) satisfies a pre-set relation with the calculated limit supercharging pressure (S P1 ); and a driving unit (17), which, in the case where the pre-set relation is satisfied, is designed to govern the wastegate valve (12) for controlling the speed of the turbine (8) as a function of the limit supercharging pressure (S P1 ) so as to limit the speed of rotation of the turbosupercharger (7) to a value substantially equal to the limit speed of rotation (N tc ).
Abstract:
An object of the invention is to prevent, in an internal combustion engine (1) equipped with a supercharger (8), excessive increase in the turbine expansion ratio resulting from a decrease in the atmospheric pressure, while reducing the decrease in the supercharging pressure. A filter (12) for trapping PM in the exhaust gas is provided in an exhaust passage (6, 7) downstream of a turbine (8b). A filter regeneration control for removing PM deposited in the filter (12) by oxidizing the PM is performed. The amount of PM deposited in said filter at which the execution of the filter regeneration control is terminated after the start of the execution of the filter regeneration control is larger when the atmospheric pressure around the vehicle equipped with the internal combustion engine is low than when it is high.
Abstract:
A control device (10) for a supercharging system for supplying compressed intake air to an engine (6) includes: an engine controller (10A) including an engine signal input part (10A1) and an engine control part (10A2) configured to control an operational state of the engine and to compute a target boost pressure of a supercharger (4); and a turbo controller (10B2) including a turbo signal input part (10B1) and a turbo control part (10B2) configured to compute a margin of the supercharger. The control device is configured to compute a target boost-pressure corrected value by correcting the target boost pressure in accordance with a magnitude of the margin computed by the turbo control part, and to control a boost-pressure control unit (12) so that the boost pressure of the supercharger reaches the target boost-pressure corrected value.