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US 8,939,240 B2Granted
Engine accessory drive system
AssigneePACCAR Inc
InventorsChristopher G. Wehrwein, William C. Kahn
Life of this patent
Estimating the term…
Abstract
An electrified engine accessory drive (EEAD) system is provided that replaces the front engine accessory drive (FEAD) components (e.g., a/c compressor, air brake compressor; power steering pump, etc.) on vehicles, such as heavy duty trucks. Using such an EEAD system aims to reduce parasitic losses induced on a conventional engine by the front engine accessory drive (FEAD) while providing additional benefits, such as engine off vehicle and/or system operation. The EEAD systems may also be used in lieu of rear-end accessory drives and other accessory drives powering multiple accessories from a common driveshaft.
Claims20
A vehicle, comprising:
- a driveline including a drive shaft and at least one driven wheel;
- a prime mover configured to provide power to the driveline to provide motive force to the vehicle;
- a plurality of vehicle accessory components;
- and
- an accessory drive unit disposed a spaced distance from the prime mover and discrete therefrom, the accessory drive unit comprising:
- an electric motor;
- a power storage source;
- a variable output converter coupled in series between the electric motor and the power storage source, the variable output converter configured to receive an input voltage from the power storage source and to provide a variable output voltage to the electric motor;
- a transmission coupled between the electric motor and the plurality of accessory components in order to transfer the output of the electric motor to the plurality of accessory components;
- and
- a plurality of coupling devices, wherein each of the plurality of coupling devices is associated with one of the plurality of accessory components;
- and
- a controller configured to control each of the plurality of coupling devices to selectively couple each of the plurality of accessory components to force transmitted by the transmission, wherein the controller is further configured to control the variable output converter to set the variable output voltage from the variable output converter to the electric motor.
10 more elements
A vehicle, comprising:
- a chassis;
- an engine carried by the chassis;
- a vehicle body carried by the chassis and including a compartment positioned below one of a vehicle door and a sleeper cab;
- and
- an accessory drive unit positioned in the compartment, the accessory drive unit comprising:
- a power storage source;
- a plurality of vehicle accessory components each having a driven input shaft;
- an electric motor variably coupled to the power storage source;
- a variable output converter coupled in series between the electric motor and the power storage source, the variable output converter configured to receive an input voltage from the power storage source and to provide a variable output voltage to the electric motor;
- a transmission coupled between the electric motor and the driven input shafts of the plurality of vehicle accessory components, the transmission configured to transfer an output of the electric motor to the plurality of accessory components;
- and
- a plurality of coupling devices coupled between the transmission and the driven input shafts;
- and
- a controller configured to control each of the plurality of coupling devices to selectively couple and decouple each of the plurality of vehicle accessory components from force transmitted by the transmission, wherein the controller is further configured to control the variable output converter to set the variable output voltage from the variable output converter to the electric motor.
11 more elements
An electrical accessory drive unit, comprising:
- a plurality of vehicle accessories, each including a driven input shaft;
- an electric motor, wherein the electric motor is separate from a prime mover of a vehicle that is configured to provide motive force to the vehicle;
- a power storage source;
- a variable output converter coupled in series between the electric motor and the power storage source, the variable output converter configured to receive an input voltage from the power storage source and to provide a variable output voltage to the electric motor;
- a transmission coupled between the electric motor and the driven input shafts of the plurality of vehicle accessories in order to transfer an output of the electric motor to the plurality of vehicle accessories;
- a plurality of coupling devices, wherein each of the plurality of coupling devices is coupled between the transmission and one of the driven input shafts;
- and
- a controller configured to control each of the plurality of coupling devices to selectively couple each of the plurality of vehicle accessories to force transmitted by the transmission, wherein the controller is further configured to control the variable output converter to set the variable output voltage from the variable output converter to the electric motor.
5 more elements
Dependencies are inferred from the claim text.