Driving power source unit for automotive power transmisson testing apparatus employing motor

• US 5,142,903 A
• Filed: 07/17/1991
• Issued: 09/01/1992
• Est. Priority Date: 11/14/1988
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Meidensha
• Original Assignee: Kabushiki Kaisha Meidensha
• Inventors: Goto, Takashi, Mizushina, Fumio, Nawa, Michio
• Primary Examiner(s): RAEVIS, ROBERT R
• Application Number:
  US07/731,641
• Time in Patent Office: 412 Days
• Field of Search: 74/661, 74/665 A, 74/665 B, 74/342, 74/344, 73/118.1
• US Class Current: 73/115.02
• CPC Class Codes: G01M 13/025 Test-benches with rotational drive means and loading means; Load or drive simulation
• CPC Class Codes: Y10T 74/19014 Plural prime movers selectively coupled to common output

Abstract

An step-up gear unit is adapted for realization of an automotive internal combustion engine simulated driving power supply in use with motor such as an electric motor, a hydraulic motor and so forth. The step-up gear unit is connected to at least two motors for selectively outputting driving torque of sole motor and combined torque of both motors for wider capacity range of capacity of engine to simulate. The gear train of the step-up gear is so composed to selectively connect and disconnect the motors to an output gear for selective output of the driving torque.

Claims

1. A test apparatus for an automotive power train comprising:

a low inertia driving power source means including a first motor, a second motor, and a step-up gear unit, said step-up gear unit including a first input shaft connected to said first motor and carrying a first input gear for driving the latter, a second input shaft connected to said second motor and carrying a second input gear for driving the latter, said second motor being independent of said first motor for independently driving said second input gear from said first input gear, an output shaft connected to a work and carrying a sole output gear for rotation therewith, a first and second intermediate gears supported on a rotary shaft, said first intermediate gear being adapted to mesh with said first input gear, said second intermediate gear being adapted to mesh with said second input gear, at least one of said first and second intermediate gear being movable for selectively engaging and disengaging with associated one of said first and second input shaft, and a third intermediate gear rigidly secured on said rotary shaft for rotation therewith and constantly meshed with said output gear for driving latter;

a first sensor for monitoring revolution speed at the input of said power train for producing an engine speed simulated data;

an engine load setting means for generating an engine load simulated data which is variable according to a desired pattern for testing various mode of operation of said power train;

means for deriving a torque demand for controlling said motors on the basis of said engine speed simulated data and said engine load simulated data, said torque demand deriving means having a plurality of torque variation characteristics relative to said engine speed simulated data value, each torque variation characteristics being set with respect to specific engine load simulated data value; and

means for controlling said motors on the basis of said torque demand for supplying input torque for said power train.

2. A transmission testing apparatus for an automotive transmission comprising:

first and second electric motor;

a step-up gear unit, said step-up gear unit including a first input shaft connected to said first motor and carrying a first input gear for driving the latter, a second input shaft connected to said second motor and carrying a second input gear for driving the latter, said second motor being independent of said first motor for independently driving said second input gear from said first input gear, an output shaft connected to a work and carrying a sole output gear for rotation therewith, a first and second intermediate gears supported on a rotary shaft, said first intermediate gear being adapted to mesh with said first input gear, said second intermediate gear being adapted to mesh with said second input gear, at least one of said first and second intermediate gear being movable for selectively engaging and disengaging with associated one of said first and second input shaft, and a third intermediate gear rigidly secured on said rotary shaft for rotation therewith and constantly meshed with said output gear for driving the latter;

a first sensor for monitoring revolution speed at the input of said transmission for producing an engine speed simulated data;

an engine load setting means for generating an engine load simulated data which is variable according to a desired pattern for testing various mode of operation of said transmission;

means for storing a plurality of engine torque variation simulated torque variation characteristics relative to said engine speed simulated data value, each torque variation characteristics being set with respect to specific engine load simulated data value;

means for selecting one of said torque variation characteristics in terms of said engine load simulated data and for deriving a torque demand on the basis of said engine speed simulated data according to the selected one of said torque variation characteristics;

means for controlling driving torque transition from a first torque demand to a second torque demand for providing an engine output torque transition simulated torque transition in response to variation of said engine load simulated data value; and

means for controlling said motors on the basis of said torque demand for supplying input torque for said transmission.