State of charge adjusted compressor control
AssigneeBendix Commercial Vehicle Systems LLC
InventorsDavid J. Pfefferl, Mark A. Matko, Marv Hamdan
Life of this patent
Estimating the term…
Abstract
The described systems and methods relate to employing an Electric Air Charging System (EACS) to maintain a hybrid commercial vehicle (or the like) battery within a desired range of charge. The innovation facilitates reducing battery charge when the state of charge is too high, such as by adjusting air compressor cut-in and cut-out pressure thresholds to cause the air compressor to compress air for the brake system when there is excess charge in the battery, as well as triggering a brake regeneration protocol and/or other charge regeneration protocol(s) to restore charge to the battery when the state of charge of the battery is too low.
Claims22
An energy management system that facilitates maintaining a hybrid commercial vehicle high-voltage battery within a predetermined state of charge (SOC) range, including:
- an air compressor that is operably coupled to a motor control unit (MCU) and powered by the vehicle high-voltage battery;
- and
- a processor in the MCU that executes computer-executable instructions, which are stored on a non-transitory computer-readable medium, including instructions for:
- detecting a state of charge for the vehicle high voltage battery;
- comparing the detected state of charge to at least a first SOC threshold and a second SOC threshold that is lower than the first SOC threshold;
- increasing a cut-in pressure threshold and a cut-out pressure threshold for the air compressor and increasing revolutions per minute (RPM) of the motor connected to the air compressor if the detected SOC is greater than or equal to the first SOC threshold, such that the air compressor begins compressing air at a higher-than-nominal pressure level and draws charge from the vehicle high-voltage battery to reduce the detected SOC thereof;
- and
- reducing the cut-in pressure threshold and the cut-out pressure threshold for the air compressor, and reducing motor speed, if the detected SOC is less than or equal to the second SOC threshold, such that the air compressor begins compressing air at a lower-than-nominal pressure level thereby conserving the detected SOC of the vehicle high-voltage battery.
A method of maintaining a hybrid commercial vehicle high voltage battery within a predetermined state of charge (SOC) range, including:
- detecting a state of charge for the vehicle high voltage battery;
- and
- via a processor:
- comparing the detected state of charge to at least a first SOC threshold and a second SOC threshold that is lower than the first SOC threshold;
- increasing a cut-in pressure threshold and a cut-out pressure threshold for an air compressor coupled to the vehicle high voltage battery and increasing revolutions per minute (RPM) of a motor connected to the air compressor if the detected SOC is greater than or equal to the first SOC threshold, such that the air compressor begins compressing air at a higher-than-nominal pressure level and draws charge from the vehicle high voltage battery to reduce the detected SOC thereof;
- and
- reducing the cut-in pressure threshold and the cut-out pressure threshold for the air compressor, and reducing motor speed, if the detected SOC is less than or equal to the second SOC threshold, such that the air compressor begins compressing air at a lower-than-nominal pressure level thereby conserving the detected SOC of the vehicle high voltage battery.
A controller that maintains a hybrid commercial vehicle high voltage battery within a predetermined state of charge (SOC) range, comprising:
- a processor connected to a motor that powers an air compressor, wherein the processor executes computer-executable instructions, which are stored on a non-transitory computer-readable medium, including instructions for:
- detecting a state of charge for the vehicle high voltage battery, which provides power to the motor;
- comparing the detected state of charge to at least a first SOC threshold and a second SOC threshold that is lower than the first SOC threshold;
- increasing a cut-in pressure threshold and a cut-out pressure threshold for the air compressor and increasing revolutions per minute (RPM) of the motor if the detected SOC is greater than or equal to the first SOC threshold, in order to cause the air compressor to begin compressing air at a higher-than-nominal pressure level and draw charge from the vehicle high voltage battery to reduce the detected SOC thereof;
- and
- reducing the cut-in pressure threshold and the cut-out pressure threshold for the air compressor, and reducing motor speed, if the detected SOC is less than or equal to the second SOC threshold, in order to cause the air compressor to begin compressing air at a lower-than-nominal pressure level thereby conserving the detected SOC of the vehicle high voltage battery.
An apparatus for maintaining a hybrid commercial vehicle high voltage battery within a predetermined state of charge (SOC) range, including:
- a state of charge detecting means for detecting a state of charge for the vehicle high voltage battery;
- a processing means for:
- comparing the detected state of charge to at least a first SOC threshold and a second SOC threshold that is lower than the first SOC threshold;
- increasing a cut-in pressure threshold and a cut-out pressure threshold for an air compressor coupled to the vehicle high voltage battery and increasing revolutions per minute (RPM) of a motor connected to the air compressor if the detected SOC is greater than or equal to the first SOC threshold, such that the air compressor begins compressing air at a higher-than-nominal pressure level and draws charge from the vehicle high voltage battery to reduce the detected SOC thereof;
- and
- reducing the cut-in pressure threshold and the cut-out pressure threshold for the air compressor, and reducing motor speed, if the detected SOC is less than or equal to the second SOC threshold, such that the air compressor begins compressing air at a lower-than-nominal pressure level thereby conserving the detected SOC of the vehicle high voltage battery.
Dependencies are inferred from the claim text.