Powertrain controls including transient torque management with dynamic release compensation
First Claim
1. A method of controlling a vehicle system including an engine, a transmission, and a control system in operative communication with and structured to control operation of the engine and the transmission, the method comprising:
- determining an operating point of the engine, the operating point including an engine torque and an engine speed;
evaluating a relationship between the operating point and a soft limit on engine torque;
modifying the soft limit to permit operation outside a boundary of the un-modified soft limit, the modifying the soft limit being constrained by a hard limit on engine torque, the act of modifying the soft limit includingdetermining a dynamic torque limit using estimated vehicle operation parameters and a feedback loop which adjusts the estimated vehicle operation parameters using actual system response information and feedback of the dynamic torque limit,determining a static torque limit using a predetermined table,and selecting the minimum of the static torque limit and the dynamic torque as an input for determining a value of the modified soft limit, the act of selecting the minimum occurring irrespective of an engine speed; and
adjusting the operating point of the engine to increase engine torque above the boundary of the un-modified soft limit, based upon a weighted optimization of a demand responsiveness criterion and a fuel consumption criterion, the weighting of the fuel consumption criterion being dynamically adjustable;
wherein the modifying and the adjusting are effective to at least one of mitigate a vehicle speed lug event and avoid a transmission shift event.
1 Assignment
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Accused Products
Abstract
One exemplary embodiment is a method of controlling a vehicle system including an engine, a transmission, and a control system in operative communication with and structured to control operation of the engine and the transmission. The method determines an operating point of the engine including an engine torque and an engine speed and evaluates a relationship between the operating point and a soft limit on engine torque. The method modifies the soft limit to permit operation outside a boundary of the un-modified soft limit. Modification of the soft limit is constrained by a non-adjustable limit. The operating point of the engine is adjusted to increase engine torque above the boundary of the un-modified soft limit. The method may mitigate a vehicle speed lug event and/or avoid a transmission shift event.
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Citations
31 Claims
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1. A method of controlling a vehicle system including an engine, a transmission, and a control system in operative communication with and structured to control operation of the engine and the transmission, the method comprising:
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determining an operating point of the engine, the operating point including an engine torque and an engine speed; evaluating a relationship between the operating point and a soft limit on engine torque; modifying the soft limit to permit operation outside a boundary of the un-modified soft limit, the modifying the soft limit being constrained by a hard limit on engine torque, the act of modifying the soft limit including determining a dynamic torque limit using estimated vehicle operation parameters and a feedback loop which adjusts the estimated vehicle operation parameters using actual system response information and feedback of the dynamic torque limit, determining a static torque limit using a predetermined table, and selecting the minimum of the static torque limit and the dynamic torque as an input for determining a value of the modified soft limit, the act of selecting the minimum occurring irrespective of an engine speed; and adjusting the operating point of the engine to increase engine torque above the boundary of the un-modified soft limit, based upon a weighted optimization of a demand responsiveness criterion and a fuel consumption criterion, the weighting of the fuel consumption criterion being dynamically adjustable; wherein the modifying and the adjusting are effective to at least one of mitigate a vehicle speed lug event and avoid a transmission shift event. - View Dependent Claims (2, 3, 4)
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5. A method of controlling a vehicle system including an engine, a transmission, and a control system in operative communication with and structured to control operation of the engine and the transmission, the method comprising:
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determining an operating point of the engine, the operating point including an engine torque and an engine speed; evaluating a relationship between the operating point and a soft limit on engine torque; modifying the soft limit to permit operation outside a boundary of the un-modified soft limit, the modifying the soft limit being constrained by a hard limit on engine torque; and adjusting the operating point of the engine to increase engine torque above the boundary of the un-modified soft limit, wherein the modifying and the adjusting are effective to at least one of mitigate a vehicle speed lug event and avoid a transmission shift event, and the modifying the soft limit is based upon a predicted future engine operating point and a dynamically adjustable weighted optimization of a demand responsiveness criterion and a fuel consumption criterion. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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14. A vehicle system comprising:
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an engine; a transmission; and a control system in operative communication with the engine and the transmission, the control system being structured to; determine an operating point of the engine, the operating point including an engine torque and an engine speed, evaluate a relationship between the operating point and a first limit on engine torque, modify the first limit to permit operation outside a boundary of the un-modified first limit, modification of the first limit being constrained by a second limit on engine torque, a modified magnitude of the first limit being determined by selecting a lesser one of a static torque limit and a dynamic torque limit, the act of selecting the minimum being uninfluenced by an engine speed, the dynamic torque limit being determined using a control loop which adjusts estimated vehicle operation parameters using actual system response information and the value of the dynamic torque limit, the static torque limit being determined based upon a table of predetermined values, and adjust the operating point of the engine to increase engine torque above the boundary of the un-modified first limit, based upon a balancing of a demand responsiveness criterion and fuel consumption criterion. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A vehicle system comprising:
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an engine; a transmission; and a control system in operative communication with the engine and the transmission, the control system being structured to; determine an operating point of the engine, the operating point including an engine torque and an engine speed, evaluate a relationship between the operating point and a first limit on engine torque, modify the first limit to permit operation outside a boundary of the un-modified first limit, modification of the first limit being constrained by a second limit on engine torque, and adjust the operating point of the engine to increase engine torque above the boundary of the un-modified first limit, wherein the control system is structured to modify the first limit based upon a predicted future engine operating point and an operator adjustable weighted optimization of a demand responsiveness criterion and a fuel consumption criterion. - View Dependent Claims (22, 23)
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24. A method comprising:
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operating a vehicle system including an engine, a transmission, and a control system in operative communication with the engine and the transmission; determining engine output information; evaluating the engine output information relative to an adjustable engine output limit; increasing the adjustable engine output limit based upon a first adjustment criterion subject to constraint by a non-adjustable engine output limit; controlling the engine output to exceed the un-modified adjustable engine output limit; and decreasing the adjustable engine output limit based upon a second adjustment criterion, wherein the first adjustment criterion is determined using the lesser of a static torque limit and a dynamic torque limit without regard to an engine speed, the static torque limit being determined using information of a transmission gear, a road grade and a vehicle mass as inputs to a predetermined lookup table, and the dynamic torque limit being determined using estimated vehicle operation parameters, a vehicle acceleration limit, and adjusted vehicle operation parameters determined using a feedback loop which adjusts the estimated vehicle operation parameters using actual system response information and the dynamic torque limit. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification