摘要:
A method of controlling a powertrain for a hybrid vehicle, the method including providing an internal combustion engine, providing a motor generator operatively coupled to the internal combustion engine, providing an automatic transmission operatively coupled to the internal combustion engine, and actuating the motor generator to a certain speed to restart the vehicle.
摘要:
A fuel management control method for a hybrid electric vehicle drive having an internal combustion engine and an electric motor arranged in parallel such that both can propel the vehicle; the system including an electric motor driven fuel pump and a programmable microprocessor; and wherein the method further includes monitoring vehicle speed and sensing braking pressure and directing signals of both vehicle speed and braking to the microprocessor and processing such inputs in accordance with an aggressive fuel management program including shut-off of fuel flow to the gas engine in response to vehicle braking at vehicle speeds above a predetermined maximum hysteresis speed and maintaining the fuel shut off during vehicle coasting above a predetermined speed while controlling the electric motor to provide regenerative braking or vehicle start during such fuel shut off modes of operation.
摘要:
A method of controlling engine crankshaft motion in a hybrid electric drive system having an internal combustion engine and a motor-generator operatively connected to a crankshaft of the engine is disclosed. The steps include monitoring the crankshaft position, forecasting a crankshaft stall position; comparing the forecast stall position with a target range; and if the forecast crankshaft stall position is outside the target range, operating the motor-generator to modify the forecast stall position to be within the target range. These steps properly position the crankshaft for re-initiating engine start-up. The method further includes the steps of calculating an effective lube interval time once the crankshaft speed is zero; comparing the effective lube interval time to a critical time; and if the effective lube interval time is greater than the critical time, pulsing the motor-generator to rock the crankshaft for a pulse time to redistribute a lubricant film.
摘要:
An anti-rollback vehicle control system reduces vehicle rollback by restarting an engine based on a grade, a brake signal, and a calculated brake release rate. In a hybrid vehicle, the control system restarts the vehicle engine and electric motor. In a conventional powertrain vehicle that utilizes a transmission with a neutral-idle mode, the control system directs the transmission to exit neutral-idle mode. The grade may be estimated based on a vehicle acceleration rate, a vehicle driving force, and resistance factors.
摘要:
A fuel delivery control system includes a vehicle speed sensor that generates a vehicle speed signal and an engine rotational speed sensor that generates an engine rotational speed signal. A control module calculates at least one of an accelerator release delay period and a brake depression delay period based on the vehicle speed signal and the engine rotational speed signal and deactivates fuel delivery to said engine after waiting at least one of the accelerator release delay period after the accelerator pedal is released and the brake depression delay period after the brake pedal is depressed.
摘要:
A dual voltage tandem engine start system provides a method for high rotational speed, low emissions, heat-engine start-ups in a hybrid electric vehicle. The system also provides a reliable backup system that can be jumpstarted in an emergency should part of the vehicle's electrical system fail. At start-up, a conventional low voltage starter motor (typically 12-volt) begins turning the heat engine up to a predetermined initial engine RPM. When this RPM is reached, a higher voltage motor/generator, in tandem with the low voltage starter motor, also begins turning the heat engine. Once a second, predetermined heat engine RPM is reached, the low voltage starter motor stops turning the engine, leaving the motor/generator to turn the heat engine to a final engine RPM where it begins fueling and combustion starts. This final engine RPM is sufficiently high to allow a low engine emission start once fueling begins.
摘要:
A fuel management control method for a hybrid electric vehicle drive having an internal combustion engine and an electric motor arranged in parallel such that both can propel the vehicle; the system including an electric motor driven fuel pump and a programmable microprocessor; and wherein the method further includes monitoring vehicle speed and sensing braking pressure and directing signals of both vehicle speed and braking to the microprocessor and processing such inputs in accordance with an aggressive fuel management program including shut-off of fuel flow to the gas engine in response to vehicle braking at vehicle speeds above a predetermined maximum hysteresis speed and maintaining the fuel shut off during vehicle coasting above a predetermined speed while controlling the electric motor to provide regenerative braking or vehicle start during such fuel shut off modes of operation.
摘要:
A hybrid vehicle includes an engine having at least one cylinder and an electric machine that drives the engine during a start-up period. A control module monitors a rotational speed of the engine and regulates torque generated by the electric machine based on the rotational speed during the start-up period and a maximum discharge power available to power the electric machine.
摘要:
A propulsion system for use in a hybrid vehicle, the propulsion system includes an internal combustion engine, an electric motor/generator operatively coupled to the internal combustion engine, an electric storage medium, and a propulsion system controller for actuating the propulsion system. The propulsion system controller varies the operating conditions of the electric motor/generator system in response to operating conditions of the vehicle. The propulsion system controller further varies the operating conditions of the electric motor/generator during an engine cranking sequence.
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.