| 摘要 |
An engine brake control system for a vehicle drive train including an internal combustion engine with an exhaust system and a turbocharger includes a variable inlet turbine in the exhaust system as part of the turbocharger which has a nozzle inlet control, a turbine wheel inlet and variable inlet nozzle vanes in the turbine wheel inlet of the variable inlet turbine and coupled with the nozzle inlet control. Further, a controller controls the variable inlet nozzle vanes through a number of positions from fully open to fully closed. Inputs to the controller affecting its operation include a speed sensor, a drive coupling sensor, a gear selection sensor, an overdrive gear sensor, an engine speed sensor, a throttle sensor, a pressure sensor and a warm-up sensor. A user interface both receives and sends information from and to the controller. The engine brake control system not only includes modulation of the engine brake, but also provides for control of a torque converter, automatic transmission and overdrive. With throttled engines, the throttle valve can be opened and the fuel supply disabled. Modulation of the variable inlet nozzle vanes is responsive to speed and acceleration. Control over the remaining engine and drive train components is used to enhance the utility of the engine brake.
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