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Shift control system/method for vehicle equipped with driveline retarder, and program products thereof

A control system and reducer technology, applied in transmission control, engine control, brakes, etc., can solve problems such as driver troubles

Inactive Publication Date: 2004-09-08
EATON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Attempts to shift gears to the target gear ratio when going downhill, especially on steep grades, can cause some annoyance and / or embarrassment to the driver by accelerating the vehicle during torque interruptions during the gear change

Method used

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  • Shift control system/method for vehicle equipped with driveline retarder, and program products thereof
  • Shift control system/method for vehicle equipped with driveline retarder, and program products thereof
  • Shift control system/method for vehicle equipped with driveline retarder, and program products thereof

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Embodiment Construction

[0011] For convenience, specific terminology will be used in the following description of the preferred embodiment, and these terms are for reference only and are not limiting. The term "mechanical transmission" refers to an automotive gearshift transmission that employs positive couplings, such as dog couplings, to selectively engage and disengage gears and shafts with other gears and shafts. Such gearboxes using synchronous and asynchronous jaws or clutches are prior art, see the aforementioned US Patent Nos. 3,105,395; 3,799,022; 4,754,665; 5,086,897; The term "driveline retarder" means a selectively actuated device for applying a generally selectively variable retarding force or torque to the main driveline of a vehicle. This device is mounted between the transmission dog clutch and the vehicle drive wheels so that disengagement of the vehicle's main clutch and / or shifting the transmission into neutral will not interrupt the retarding action of the vehicle's main driveline...

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PUM

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Abstract

A control system and method is provided for controlling shifting of a vehicular powertrain system (10) including an internal combustion engine (12) drivingly coupled to a mechanical change-gear transmission (14) having a transmission output shaft (22) drivingly coupled to vehicular drive wheels (26) and having a driveline retarder (52) associated therewith. To prevent undesirable vehicle acceleration during shift transients occurring when the vehicle is traveling down a grade, input signals indicative of engine torque (TORQUEE) and vehicle acceleration (dOS / dt) are sensed and, if engine torque is negative (TORQUEE < REF1) and vehicle acceleration is positive (dOS / dt > REF2), the retarder is caused to apply an increased level of retarding torque to the vehicle drive wheels.

Description

technical field [0001] The present invention relates to a shift control system / method for fully automatic or semi-automatic mechanical gearbox shifting of a vehicle equipped with a driveline retarder located between the clutch of the gearbox and the main drive mechanism of the vehicle between. More particularly, the present invention relates to a shift control system / method which minimizes or eliminates the undesired tendency of the vehicle to accelerate during a shift if the vehicle is going downhill. Background technique [0002] Mechanical gear shift transmissions employing both synchronous and asynchronous types of rigid jaw clutches and selectively engaging and disengaging target gear ratios are prior art, see U.S. Patent Nos. 3,105,395; 3,799,022; 4,754,665; 5,086,897; No. 5,370,013, the disclosure of the above reference is incorporated herein by reference. [0003] Fully automatic or semi-automatic mechanical transmission systems for vehicles also belong to the prio...

Claims

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Application Information

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IPC IPC(8): B60K23/00B60T10/00B60T11/00B60W10/04B60W10/18B60W30/18F02D45/00F16H61/02F16H61/21
CPCB60T10/00B60W2510/1045B60W10/196F16H61/21F16H2059/405B60K41/082B60W10/06F16H61/0403F16H2061/0411B60W30/19B60W2510/0657
Inventor I·R·J·贝茨
Owner EATON CORP
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