# US 10,309,298 B2 · Control device of an engine

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- Number: US 10,309,298 B2
- Document ID: US10309298B2
- Status: Granted
- Kind: B2
- Application number: 15/217,916
- Filed: 2016-07-22
- Published: 2017-02-02
- Granted: 2019-06-04
- Earliest claimed: 2015-07-29
- Assignees: Mazda Motor Corporation
- Applicants: Mazda Motor Corporation
- Inventors: Takafumi Nishio
- Web page: https://patentgrep.com/patent/US10309298B2

## CPC

- F02B 37/183: {Arrangements of bypass valves or actuators therefor}
- F02B 33/40: of non-positive-displacement type
- F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere}
- F02B 39/08: Non-mechanical drives, e.g. fluid drives having variable gear ratio
- F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)}
- F02D 41/1401: {characterised by the control or regulation method (F02D41/1473, F02D41/1477 take precedence)}
- F02D 41/1445: {the characteristics being related to the exhaust flow}
- F02D 41/2464: {Characteristics of actuators}
- F02M 35/10157: {Supercharged engines}
- F02D 2041/1409: {using at least a proportional, integral or derivative controller}
- F02D 2041/1422: {Variable gain or coefficients}
- F02D 2041/1433: {using a model or simulation of the system}
- F02D 2200/0406: Intake manifold pressure
- Y02T 10/12: Improving ICE efficiencies
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

To improve the controllability of the feedback control of the boost pressure, an ECU comprises a valve control part that feedback controls a boost pressure of a turbocharger based on a deviation between a target boost pressure and an actual boost pressure, and a determination part that determines whether or not the exhaust state in an exhaust passage can achieve the target boost pressure, and the feedback control includes at least an integral term, and when the determination part determines the exhaust state cannot achieve the target boost pressure, the valve control part reduces the influence of the deviation on the calculation of integral term compared with that when the exhaust state can achieve the target boost pressure.

## Claims

### Claim 1

A control system of an engine, the system comprising:
a turbocharger having a turbine that is provided to an exhaust passage and a compressor that is provided to an intake passage,
a turbine bypass passage for diverting exhaust around the turbine,
a wastegate valve that is provided to the turbine bypass passage for controlling a flow rate of the exhaust flowing in the turbine bypass passage, and
a control device executed on a processor including:
a valve control part, executed on the processor, for performing a feedback control of a boost pressure of the turbocharger based on a deviation between a target boost pressure and an actual boost pressure, and
a determination part, executed on the processor, for obtaining a target turbine flow rate that is a target value of the flow rate of the exhaust flowing to the turbine from the target boost pressure, for obtaining an exhaust total flow rate discharging from the engine, and for determining whether or not the exhaust total flow rate discharging from the engine in the exhaust passage is greater than or equal to the target turbine flow rate, such that the target boost pressure will be achieved, the target turbine flow rate being based on the target boost pressure,
wherein the feedback control includes at least an integral term, and when the determination part determines that the exhaust total flow rate is smaller than the target turbine flow rate such that the target boost pressure will not be achieved, the valve control part controls an opening degree of the wastegate valve so as to reduce an influence of the deviation on a calculation of the integral term compared to that when the exhaust total flow rate is greater than or equal to the target turbine flow rate such that the target boost pressure will be achieved.

### Claim 2 (depends on 1)

The control system of the engine according to claim 1,
wherein the valve control part calculates the integral term that is a correction amount corresponding to an integrated value from a time integration of a driving force deviation of the compressor calculated from the boost pressure, and when the determination part determines that the exhaust total flow rate is smaller than the target turbine flow rate such that the target boost pressure will not be achieved, the valve control part stops the calculation of the integrated value of the driving force deviation.