摘要:
Provided is an intake manifold pressure control apparatus, or vacuum pump, for a hybrid propulsion system. The vacuum pump is operable to evacuate the intake manifold of an internal combustion engine, thereby lowering the Manifold Absolute Pressure, or MAP, to a predetermined level to enable a quick restart of the internal combustion engine. This vacuum pump may also be used to evacuate hydrocarbons, or HCs, from within the intake system to prevent evaporative emissions from the intake manifold upon engine shutdown. In the preferred embodiment, the vacuum pump is operated by a motor that can simultaneously operate an auxiliary transmission oil pump. Additionally, the present invention provides a method of controlling the hybrid propulsion system to enable the manifold pressure control apparatus to lower the MAP value within the intake manifold as well as a method of evacuating HCs from the intake manifold upon engine shutdown.
摘要:
A method and article of manufacture is provided to control an automatic transmission which includes a hydraulic fluid circuit having an electrically-driven auxiliary hydraulic pressure pump. It includes determining the internal combustion engine is shut off during vehicle operation, and monitoring fluidic pressure at a plurality of locations in the hydraulic circuit. Operation of the electrically-driven auxiliary hydraulic pressure pump is commanded to an elevated voltage level when the engine is shut off and the fluidic pressures fail to register substantially proper pressure levels. It includes discontinuing operation of the electrically-driven auxiliary hydraulic pressure pump when the engine is subsequently commanded on, or when an elapsed measure of time has passed, or when the monitored fluidic pressures register substantially proper pressure levels.
摘要:
An anti-rollback control system for a vehicle having a brake system includes a brake pedal that is operable to induce a brake pressure in the brake system and a control module that holds the brake pressure equal to a hold pressure that is based on an incline angle to inhibit rollback of the vehicle when pressure is relieved from the brake pedal. The control module initiates forward propulsion of the vehicle based on a driver input and reduces the brake pressure from the hold pressure concurrent to initiating the forward propulsion.
摘要:
The method of the present invention provides a variety of vehicle performance characteristics depending on the mode of operation. A first routine is initiated to provide an optimal balance of powertrain responsiveness and fuel economy for any given combination of vehicle speed and deceleration rate. The first routine may, according to a preferred embodiment, include a plurality of routines that are each configured to provide an optimal balance of powertrain responsiveness and fuel economy within a predefined range of vehicle speeds and deceleration rates. A second routine is initiated if said deceleration rate is within a predefined range. The second routine includes running the electric motor/generator while the hybrid vehicle is being stopped in order to control the driveline lash and thereby minimize disturbances during a subsequent engine re-start.
摘要:
A method of performing a first start of an internal combustion engine of a hybrid electro-mechanical vehicle includes activating an auxiliary power module prior to the engine starting to direct power stored in a high voltage battery (used for powering the motor/generator(s) on the hybrid vehicle) through the auxiliary power module at a voltage level of a low voltage battery to assist the low voltage battery in powering a starter motor for starting the internal combustion engine.
摘要:
Methods and apparatus are provided for controlling the climate cooling in the passenger cabin of a hybrid motor vehicle. The apparatus includes an internal combustion engine capable of being started and temporarily stopped, an air conditioning compressor and a dedicated electric compressor motor coupled to drive the air conditioning compressor. Moreover, sensors are coupled to monitor selected parameters associated with the motor vehicle. An electronic controller is coupled to the internal combustion engine, the compressor motor and the sensors. The engine when running operates the compressor to provide cabin climate cooling. The controller responds to the selected parameters to selectively drive the compressor motor to selectively drive the compressor when the engine is temporarily stopped so that the climate cooling continues to be supplied to the cabin if certain monitored conditions are met. The controller terminates the operation of the compressor motor when the engine is restarted and the engine then again drives the compressor.
摘要:
A system and method for modifying a transmission in a gasoline-electric hybrid vehicle to couple the transmission to an off-axis electric motor. The transmission includes a motor-driven gear that replaces or modifies an engine-driven reverse gear. The motor-driven gear is hard-splined to an output shaft of the transmission. An electric motor is coupled to the output shaft of the transmission via the motor-driven gear. The electric motor may thus be oriented along an axis that differs from the axis of the transmission's output shaft.
摘要:
A motor operation control system and method for controlling first and second electric motors of an electrically variable transmission. The system and method determine a minimum battery power associated with a torque of the second electric motor, set the torque of the second electric motor based on the determined minimum battery power, and set a torque of the first electric motor based on the determined minimum battery power.
摘要:
A system and method of controlling first and second electric motors of a vehicle having an electrically variable transmission during an engine start/stop operation. The system and method determine a type of shift being performed, determine if a first clutch is being applied or released during the shift, determine if a second clutch is being applied or released during the shift, determine an acceleration limit based on the shift being performed and which clutch is being applied and/or released, determine acceleration and speed profiles based on the shift being performed, which clutch is being applied and/or released and the acceleration limit, determine a first electric motor torque and a second electric motor torque based on the acceleration and speed profiles, and set the torques of the first and second electric motors to the determined first and second electric motor torques.
摘要:
An electro-mechanical drive unit connectable with multiple power sources for launching and propelling a vehicle includes an output member, a stationary member, a gear-train, and a torque-transmitting device. The drive unit also includes a compound planetary gear arrangement having a first, second, third, and fourth junction points. The power sources include a first motor/generator and a second motor/generator. The second motor/generator is operatively connected to the compound planetary gear arrangement at the first junction point via the gear-train and the output member is operatively connected to the compound planetary gear arrangement at the second junction point. Additionally, the first motor/generator is operatively connected to the compound planetary gear arrangement at the fourth junction point. Furthermore, the torque-transmitting device is engageable to ground the third junction point to the stationary member.