Engine measuring equipment

• US 7,142,974 B2
• Filed: 03/30/2005
• Issued: 11/28/2006
• Est. Priority Date: 11/16/2004
• Status: Expired due to Fees

• Current Assignee: A&D Company Limited
• Original Assignee: A&D Company Limited
• Inventors: Kondo, Keniti, Furukawa, Hikaru, Sugita, Mitsuharu
• Primary Examiner(s): KWON, JOHN
• Application Number:
  US11/092,757
• Publication Number:
  US 20060106526A1
• Time in Patent Office: 608 Days
• Field of Search: 701/114, 324/379, 702/33, 702/41, 702/44, 702/85, 702/79, 702/94, 702105-115, 702/124, 702/150, 702/151, 702/176, 702/178, 702/189, 702182-184
• US Class Current: 701/114
• CPC Class Codes: G01L 3/24 Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
• CPC Class Codes: G01M 15/044 by monitoring power, e.g. by operating the engine with one of the ignitions interrupted; by using acceleration tests

Abstract

Engine measuring equipment for obtaining engine torque regarded as necessary for engine performance assessments for a short time period during a period when engine revolution is under a transient state is disclosed. The engine measuring equipment includes a central control unit for controlling throttle opening degrees due to revolution of the engine and load torque of the dynamometer; a detector connected to an output shaft of the engine, for detecting measurement data including at least revolution and shaft torque of the engine driven by controlling the central control unit; and a signal processing unit for measuring engine torque based on measurement data from the detector. The signal processing unit operates so as to calculate the engine torque based on time series data of the revolution and the shaft torque detected with the detector to measure engine torque from transient state data.

Claims

1. An engine measuring equipment for measuring engine performance in bench tests implemented with an engine and a dynamometer connected to the engine, the engine measuring equipment comprising:

a central control unit for controlling throttle opening degrees due to revolution of the engine and load torque of the dynamometer;

a detector connected to an output shaft of the engine, for detecting measurement data including at least revolution and shaft torque of the engine driven by controlling the central control unit; and

a signal processing unit for measuring engine torque based on measurement data from the detector,

wherein the central control unit implements such controlling that the revolution is lead to a transient state, and wherein the shaft torque varies during a period of the transient state; and

wherein the signal processing unit calculates the engine torque based on time series data of the revolution and the shaft torque detected with the detector to measure engine torque from transient state data.

2. The engine measuring equipment according to claim 1, wherein the engine torque is calculated by performing computing process including time differentiation of the time series data of the revolution and/or shaft torque.

3. The engine measuring equipment according to claim 1 or 2, wherein the central control unit performs control operation so that the load torque is increased or decreased sequentially by each predetermined value while the throttle opening degrees changes for at least one cycle from the minimum value to the maximum value at each step of the predetermined value.

4. The engine measure equipment according to claim 1 or 2, further comprising a display unit for displaying characteristics of relationship between the engine torque and the revolution.

5. The engine measuring equipment according to claim 1 or 2, further comprising an assessing unit for implementing validity assessment on the test conditions and/or reliability assessment on the measurement data, and/or effectiveness assessment on the correction data and engine torque calculated on the basis of the measurement data.