Methods and systems for controlling air flow paths in a machine

Abstract

A method comprising: adjusting a coolant flow through a gas mixing tank reservoir (100, 200) fluidly coupled to both an intake system (170) and an exhaust system (172) of the internal combustion engine (168) in response to a request to provide secondary air injection to the exhaust system (172) and / or exhaust gas recirculation to the intake system (170) via the gas mixing tank reservoir (100, 200) based on a temperature of the coolant entering the gas mixing tank reservoir (100, 200), wherein adjusting the coolant flow comprises maintaining a current coolant flow through the gas mixing tank reservoir (100, 200) in response to the request being a request to provide secondary air injection to the exhaust system (172) to only maintain turbine speed regardless of the temperature of the coolant entering the gas mixing tank reservoir (100, 200) occurs.

Claims

[1] Procedure comprising: Adjusting a coolant flow through a gas mixing tank reservoir (100, 200) fluidly coupled to both an intake system (170) and an exhaust system (172) of the internal combustion engine (168) in response to a request to provide secondary air injection to the exhaust system (172) and / or exhaust gas recirculation to the intake system (170) via the gas mixing tank reservoir (100, 200) based on a temperature of the coolant entering the gas mixing tank reservoir (100, 200), wherein adjusting the coolant flow comprises maintaining a current coolant flow through the gas mixing tank reservoir (100, 200) in response to the request being a request to provide secondary air injection to the exhaust system (172) to only maintain the turbine speed regardless of the temperature of the coolant entering the gas mixing tank reservoir (100, 200) occurs. [2] The method of claim 1, further comprising, after adjusting the coolant flow through the gas mixing tank reservoir (100, 200), providing exhaust gas injection and / or exhaust gas recirculation as requested in response to a temperature of gases within the gas mixing tank reservoir (100, 200) being at a desired temperature, wherein the desired temperature is based on an indicated location for injecting the gases from the gas mixing tank reservoir (100, 200) to the intake system (170) and / or the exhaust system (172). [3] The method of claim 2, further comprising, when the request is a request to provide secondary air injection to the exhaust system (172), selectively providing secondary air injection to an exhaust manifold (178) and a turbine bypass disposed around a turbine (186) based on a first pre-turbine catalyst temperature and a second post-turbine catalyst temperature. [4] The method of claim 3, wherein selectively providing secondary air injection comprises providing secondary air injection to the exhaust manifold (178) in response to the first temperature being below a first catalyst light-off temperature of the pre-turbine catalyst, and providing secondary air injection to the turbine bypass in response to the second temperature being below a second catalyst light-off temperature of the post-turbine catalyst. [5] The method of claim 1, wherein in response to the request being a request to provide secondary air injection to the exhaust system (172), adjusting the coolant flow comprises: Increasing the coolant flow through the gas mixing tank reservoir (100, 200), if the coolant temperature is higher than a threshold temperature, and Reducing the coolant flow through the gas mixing tank reservoir (100, 200), when the coolant temperature is lower than the threshold temperature. [6] The method of claim 5, further comprising, after adjusting the coolant flow through the gas mixing tank reservoir (100, 200), delaying delivery of the secondary air injection to the exhaust system (172) until the coolant temperature reaches a desired coolant temperature for secondary air injection. [7] The method of claim 6, wherein the threshold temperature is set based on a gas temperature within the gas mixing tank reservoir (100, 200) prior to setting and the desired coolant temperature for the secondary air injection. [8] The method of claim 1, wherein in response to the request being a request to provide low pressure exhaust gas recirculation to the intake system (170) upstream of a compressor (184), adjusting the coolant flow comprises: Increasing the coolant flow through the gas mixing tank reservoir (100, 200), if the coolant temperature is higher than a threshold temperature and Condensate is indicated on the compressor (184), or when the coolant temperature is lower than the threshold temperature and no condensate is indicated on the compressor (184), and Reducing the coolant flow through the gas mixing tank reservoir (100, 200), when the coolant temperature is higher than the threshold temperature and no condensate is indicated on the compressor (184), or when the coolant temperature is lower than the threshold temperature and condensate is indicated on the compressor (184). [9] The method of claim 1, wherein in response to the request being a request to provide high pressure exhaust gas recirculation to the intake system (170) downstream of a compressor (184), adjusting the coolant flow comprises: Increasing the coolant flow through the gas mixing tank reservoir (100, 200), if the coolant temperature is lower than a threshold temperature, and Increasing the coolant flow through the gas mixing tank reservoir (100, 200), when the coolant temperature is higher than the threshold temperature. [10] The method of claim 1, further comprising adjusting the flow of coolant through the gas mixing tank reservoir (100, 200) in response to a request to deliver air injection to the intake system (170) upstream of a compressor (184) based on compressor surges, wherein adjusting the flow of coolant comprises: Increasing the coolant flow through the gas mixing tank reservoir (100, 200), if the coolant temperature is higher than a threshold temperature, and Reducing the coolant flow through the gas mixing tank reservoir (100, 200), when the coolant temperature is lower than the threshold temperature. [11] The method of claim 1, further comprising storing gases from at least one of the intake system (170) and the exhaust system (172) in response to an amount of exhaust gas stored within the gas mixing tank reservoir (100, 200) being lower than a threshold level, and / or boost pressure being higher than a desired boost pressure for torque demand and / or a deceleration fuel cut-off condition. [12] System for a machine, comprising: a gas mixing tank reservoir (100, 200) positioned between an intake system (170) and an exhaust system (172) of the internal combustion engine (168), comprising: a first gas inlet port (120, 220) fluidly coupled to an exhaust manifold (178); a second gas inlet port (112, 212) fluidly coupled to an intake passage (108, 208) downstream of a compressor (184), a first gas outlet port (144, 244) fluidly coupled to the intake passage (108, 208); a second gas outlet port (136, 236) fluidly coupled to the exhaust system (172); Coolant passages (156, 160, 256, 260) configured to allow coolant to flow through the gas mixing tank reservoir (100, 200); and a first valve (162, 262) fluidly coupled to the coolant passages (156, 160, 256, 260) and configured to adjust the flow of coolant through the coolant passages (156, 160, 256, 260), wherein the second gas outlet port (136, 236) is selectively coupled via a second valve (130, 230) to both the exhaust manifold (178) and the turbine bypass passage (135) disposed around a turbine (186) of the exhaust system (172). [13] The system of claim 12, further comprising a controller (169) having computer-readable instructions to adjust a position of the first valve (162, 262) in response to a request to deliver one or more gases stored within the gas mixing tank reservoir (100, 200) to the exhaust system (172) via the second gas outlet port (136, 236) and gas stored within the gas mixing tank reservoir (100, 200) to the intake system (170) via the first gas outlet port (144, 244) based on a temperature of the coolant entering the coolant passages (156, 160, 256, 260). [14] The system of claim 13, wherein the first gas outlet port (144, 244) is fluidly coupled to the intake passage (148, 152, 248, 252) upstream of the compressor (184), and wherein the gas mixing tank reservoir (100, 200) further comprises a third gas outlet port (128, 228) fluidly coupled to the intake passage (108, 208) downstream of the compressor (184).

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