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A powertrain and vehicle technology, applied in the field of gear transmission and powertrain
Inactive Publication Date: 2009-02-11
斯特里兹伯格许可股份公司
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[0009] Another problem is caused by the torque ripple mitigation device connected between the engine and the gearbox input shaft
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[0038] FIG. 1 is a schematic diagram of a powertrain similar to that described in US Patent 6,740,002. This powertrain comprises: an internal combustion engine 101, also known as a deflagration engine; a flywheel with an integrated engine side electric machine EM 102; a damper 102 for absorbing engine torque fluctuations; a mechanical linkage 103; a tire side electric machine TM 105; 106; a differential 107; and two axles 109 and 110 terminating in tires.
[0039] To facilitate control, an angular position sensor is provided, hereinafter referred to as an encoder. Encoder 114 tracks the angular position of EM 102 and engine 101 . Encoder 115 tracks the angular position of the input shafts of TM 105 and gearbox 106 . The encoder 116 or 120 tracks the angular position of the gearbox layshaft. A torque sensor 119 or 117 / 118 may be added to sense the torque applied to the tire.
[0040] The mechanical linkage 103 may be a clutch capable of high torque slip in a conventional dr...
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Abstract
A fast automated gear shift operation is performed using a powertrain in a hybrid vehicle, the powertrain including a gear box, an engine, at least one controllable motor, a torque ripple damping device, a mechanical connecting device for connecting or disconnecting the engine to or from, respectively, wheels of the vehicle. In the gear shift operation the motor is controlled to perform a sequence of steps in which different torques are delivered by the motor to temporarily change the speed thereof. The torques are selected so that they reduce the mechanical tension over at least one elastic part of the powertrain. Hence it can be achieved, that during at least a period during the gear shift operation torques over mechanical elements in the gear box cooperating in the current gear and/or over the mechanical connecting device are eliminated or at least strongly reduced. The period should be sufficiently long so as to permit disconnection of said mechanical elements cooperating for the present gear and/or to permit disconnection of the mechanical connection device.
Description
[0001] related application [0002] This application claims priority and benefit from the following Swedish patent applications: 0502543-2 filed November 15, 2005, 0502650-5 filed November 27, 2005, 0502793-3 filed December 5, 2005, 0600241-4 filed February 6, 2006, 0502799-0 filed December 12, 2005, 0502901-2 filed December 12, 2005, 0502894-9 filed December 23, 2006 0601082-1 filed May 15, 0601252-0 filed June 6, 2006, 0601618-2 filed July 23, 2006, 0602107-5 filed October 3, 2006, October 2006 0602108-3, filed October 5, and 0602274-3, filed October 22, 2006, the entire teachings of the aforementioned patent applications are hereby incorporated by reference. technical field [0003] The present invention relates generally to hybrid vehicles, and more particularly to powertrains in such vehicles and methods of using the same for gear shifting. Background technique [0004] Actuator-controlled "manual" type gearboxes were considered in the 1990s as an obvious replacemen...
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