PATENT CLAIM ANALYSIS

Application Number: 15873042
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2019-01
Patent Classification: ["060", "602000"]

Abstract:
In a control device for an internal combustion engine, when a target pre/post compressor pressure ratio calculated by a target pre/post compressor pressure ratio calculation part is more than a turbine-limit-time pre/post compressor pressure ratio calculated by a turbine-limit-time pre/post compressor pressure ratio calculation part, an upper limit of the target pre/post compressor pressure ratio is limited by the turbine-limit-time pre/post compressor pressure ratio, and a change rate of the target pre/post compressor pressure ratio is limited by a change rate limit value during a change rate limitation period after upper limit limitation processing starts, thereby preventing the target pre/post compressor pressure ratio from being suddenly fluctuated by a sudden fluctuation in a compressor passage flow rate, and suppressing the occurrence of the over rotation of the turbine and the control hunting.

Claim (Index 1):
A control device for an internal combustion engine, which is configured to control an internal combustion engine provided for a vehicle,\n the vehicle comprising:\n a throttle valve, which is provided in an intake passage of the internal combustion engine; \n an air flow sensor, which is configured to detect an intake air flow rate in the intake passage of the internal combustion engine; \n a turbocharger, which includes a turbine provided in an exhaust passage of the internal combustion engine, and a compressor provided in the intake passage of the internal combustion engine and configured to rotate integrally with the turbine; \n an exhaust bypass passage, which is configured to allow an upstream side and a downstream side of the turbine to communicate to each other; \n a wastegate valve, which is provided in the exhaust bypass passage, and is configured to adjust a flow rate of exhaust gas of the internal combustion engine, which flows through the exhaust bypass passage; \n an actuator, which is configured to drive the wastegate valve to change an open position of the wastegate valve; and \n a throttle upstream pressure sensor, which is configured to detect an actual throttle upstream pressure having an actual value of a pressure of intake air on an upstream side of the throttle valve, which is compressed by the compressor, \n the control device for an internal combustion engine comprising:\n a target throttle upstream pressure calculation part, which is configured to calculate a target throttle upstream pressure having a target value of the pressure of the intake air compressed by the compressor, based on an operation state of the internal combustion engine; \n a target pre/post compressor pressure ratio calculation part, which is configured to calculate a target pre/post compressor pressure ratio based on the target throttle upstream pressure; \n a feedback correction amount calculation part, which is configured to carry out feedback control corresponding to a difference between the actual throttle upstream pressure detected by the throttle upstream pressure sensor and the target throttle upstream pressure calculated by the target throttle upstream pressure calculation part, to thereby calculate a feedback correction amount for a target opening degree of the wastegate valve based on the target pre/post compressor pressure ratio; \n a target opening-degree calculation part, which is configured to calculate, based on the feedback correction amount, the target opening degree of the wastegate valve required for matching the actual throttle upstream pressure with the target throttle upstream pressure to output the target opening degree to the actuator; \n a compressor passage flow rate calculation part, which is configured to calculate a compressor passage flow rate passing through the compressor based on the intake air flow rate detected by the air flow sensor; \n a compressor upstream-side pressure calculation part, which is configured to calculate a pressure on an upstream side of the compressor based on an atmospheric pressure; \n a compressor downstream-side pressure calculation part, which is configured to calculate a pressure on a downstream side of the compressor based on the actual throttle upstream pressure detected by the throttle upstream pressure sensor; and \n a turbine-limit-time pre/post compressor pressure ratio calculation part, which is configured to calculate, based on the compressor passage flow rate, a turbine-limit-time pre/post compressor pressure ratio being a pressure ratio of the pressure on the downstream side to the pressure on the upstream side of the compressor at a turbine limit revolution number, \n the target pre/post compressor pressure ratio calculation part being configured to compare the target pre/post compressor pressure ratio and the turbine-limit-time pre/post compressor pressure ratio with each other, and to carry out upper limit limitation processing of limiting the target pre/post compressor pressure ratio by the turbine-limit-time pre/post compressor pressure ratio when the target pre/post compressor pressure ratio is more than the turbine-limit-time pre/post compressor pressure ratio, the target pre/post compressor pressure ratio calculation part being configured to carry out change rate limitation processing of limiting a change rate of the target pre/post compressor pressure ratio limited by the turbine-limit-time pre/post compressor pressure ratio so as to avoid exceeding a change rate limit value set in advance during a period set in advance after execution of the upper limit limitation processing starts.

Metadata:
- Claim Count in Document: 50.0
- Percentile: 86.0
- Lexical Diversity: 2.42105
- Patent Class: 60.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['13614743', '13908502', '13404424', '14250931', '15131526']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7310887544114134
- 35 USC 102 Novelty (BERT): 0.5306633061421571
- Combined Prediction Score: 0.7110462095844878
- Mean Citation Score: 345.940852
- Max Citation Score: 380.06995
- Similarity Product: 344.4631302838207

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test