Engine pump loss control to improve battery system charging and overall vehicle efficiency
First Claim
1. A system for a mild hybrid vehicle, the system comprising:
- a belt-driven starter generator (BSG) system including a motor generator unit (MGU) physically coupled to a crankshaft of an engine of the vehicle, the MGU being electrically connected to a battery system of the vehicle; and
a control system configured to;
detect a deceleration fuel shutoff (DFSO) event where fueling to the engine is disabled; and
in response to detecting the DFSO event;
determine a desired pumping loss for the engine based on a parameter of the battery system, the desired pumping loss corresponding to a desired amount of electrical energy that the MGU will generate to charge the battery system;
determine an initial position for a throttle valve of the engine based on the desired engine pumping loss and a speed of the engine;
command the throttle valve to the initial position;
estimate an actual pumping loss of the engine based on an estimated airflow into the engine; and
adjust the position of the throttle valve based on a difference between the desired and actual engine pumping losses.
1 Assignment
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Accused Products
Abstract
Techniques for a mild hybrid vehicle utilize a control system for detecting a deceleration fuel shutoff (DFSO) event where fueling to an engine is disabled and in response to detecting the DFSO event: determining a desired pumping loss for the engine based on a parameter of a battery system, the desired pumping loss corresponding to a desired amount of electrical energy that a motor generator unit (MGU) of a belt-driven starter generator (BSG) system will generate to charge the battery system; commanding a throttle valve of the engine to an initial position determined based on the desired engine pumping loss and a speed of the engine; estimating an actual pumping loss of the engine based on an estimated airflow into the engine; and adjusting the position of the throttle valve based on a difference between the desired and actual engine pumping losses.
11 Citations
16 Claims
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1. A system for a mild hybrid vehicle, the system comprising:
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a belt-driven starter generator (BSG) system including a motor generator unit (MGU) physically coupled to a crankshaft of an engine of the vehicle, the MGU being electrically connected to a battery system of the vehicle; and a control system configured to; detect a deceleration fuel shutoff (DFSO) event where fueling to the engine is disabled; and in response to detecting the DFSO event; determine a desired pumping loss for the engine based on a parameter of the battery system, the desired pumping loss corresponding to a desired amount of electrical energy that the MGU will generate to charge the battery system; determine an initial position for a throttle valve of the engine based on the desired engine pumping loss and a speed of the engine; command the throttle valve to the initial position; estimate an actual pumping loss of the engine based on an estimated airflow into the engine; and adjust the position of the throttle valve based on a difference between the desired and actual engine pumping losses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of operating a mild hybrid vehicle having a belt-driven starter generator (BSG) system including a motor generator unit (MGU) physically coupled to a crankshaft of an engine of the vehicle and electrically connected to a battery system of the vehicle, the method comprising:
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detecting, by a control system of the vehicle, a deceleration fuel shutoff (DFSO) event where fueling to the engine is disabled; and in response to detecting the DFSO event; determining, by the control system, a desired pumping loss for the engine based on a parameter of the battery system, the desired pumping loss corresponding to a desired amount of electrical energy that the MGU will generate to charge the battery system; determining, by the control system, an initial position for a throttle valve of the engine based on the desired engine pumping loss and a speed of the engine; commanding, by the control system, the throttle valve to the initial position; estimating, by the control system, an actual pumping loss of the engine based on an estimated airflow into the engine; and adjusting, by the control system, the position of the throttle valve based on a difference between the desired and actual engine pumping losses. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification