SE539624C2 - Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle - Google Patents

Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle Download PDF

Info

Publication number
SE539624C2
SE539624C2 SE1650140A SE1650140A SE539624C2 SE 539624 C2 SE539624 C2 SE 539624C2 SE 1650140 A SE1650140 A SE 1650140A SE 1650140 A SE1650140 A SE 1650140A SE 539624 C2 SE539624 C2 SE 539624C2
Authority
SE
Sweden
Prior art keywords
engine
auxiliary brake
vehicle
torque
output shaft
Prior art date
Application number
SE1650140A
Other languages
Swedish (sv)
Other versions
SE1650140A1 (en
Inventor
Molin Patrik
Original Assignee
Scania Cv Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1650140A priority Critical patent/SE539624C2/en
Priority to DE102017000573.7A priority patent/DE102017000573B4/en
Publication of SE1650140A1 publication Critical patent/SE1650140A1/en
Publication of SE539624C2 publication Critical patent/SE539624C2/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/24—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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
    • G01M15/044—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring power, e.g. by operating the engine with one of the ignitions interrupted; by using acceleration tests
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T10/00—Control or regulation for continuous braking making use of fluid or powdered medium, e.g. for use when descending a long slope
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/13—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the tractive or propulsive power of vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/02—Details or accessories of testing apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Testing Of Engines (AREA)
  • Hybrid Electric Vehicles (AREA)

Description

Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle TECHNICAL FIELD The present invention relates to a method for assessing an engine characteristic of a vehicle. The present invention further relates to a computer program for performing a method for assessing an engine characteristic of a vehicle, and to a computer program product for performing a method for assessing an engine characteristic of a vehicle. The present invention also relates to a vehicle comprising a control unit configured to perform a method for assessing an engine characteristic.
BACKGROUND It is desirable to measure and/or verify engine characteristics and/or engine performance of a vehicle engine. The engine characteristics may for instance relate to an engine torque provided by the engine of a vehicle. The vehicle may be e.g. a heavy goods vehicle, a lorry, a truck, a pickup, a van, a wheel loader, a bus, a car or other similar motorized manned or unmanned vehicle, designed for land-based propulsion.
The engine torque may be measured using various methods. For instance, the vehicle may be driven on a chassis dynamometer, which brakes the driven wheels of the vehicle e.g. with a constant torque in order to measure an engine torque produced by the engine of the vehicle.
US 2014/0148993 discloses a method for verifying an engine torque estimation utilising estimated vehicle weight values. The method includes estimating the engine torque based on the amount of fuel injected into the engine, where the engine torque is obtained from a fuel injection table, estimating a first vehicle weight value by a calculation based on acceleration of the vehicle and the estimated engine torque, estimating an auxiliary brake torque by using an auxiliary brake table, estimating a second vehicle weight value by a calculation based on the estimated auxiliary brake torque. The first vehicle weight value is compared with the second vehicle weight value. If the vehicle weight value resulting from the brake torque estimation, i.e. the second vehicle weight, is higher than the vehicle weight value resulting from the engine torque estimation, i.e. the first vehicle weight, by a predefined factor, it can be assumed that the engine control parameters have been manipulated. The predefined factor used is dependent on different environmental and vehicle parameters, but should be higher than the tolerances for both the engine torque estimation and the brake torque estimation. The method assists in detecting if an actual engine torque value deviates from the original engine torque value of a vehicle without measuring the engine torque with a separate torque sensor.
SUMMARY It is an object of the present invention to provide a method for assessing an engine characteristic of an engine of a vehicle.
According to an aspect of the invention, the object is achieved by a method for assessing an engine characteristic of a vehicle comprising an engine, a transmission connected to the engine, an output shaft connected to the transmission, an auxiliary brake configured to apply a brake torque to the output shaft, and drive wheels driven by the engine via the transmission and the output shaft. The method comprises steps of: - disconnecting the output shaft from the drive wheels, - rotating the output shaft by running the engine, - braking the output shaft with the auxiliary brake, and - measuring a time related parameter of the engine.
Since the step of measuring a time related parameter of the engine is performed with the output shaft disconnected from the drive wheels, no chassis dynamometer is required for assessing the engine characteristics of the vehicle. As a result, the above mentioned object is achieved. Further, since the output shaft is disconnected from the drive wheels, the engine characteristic of the vehicle may be assessed with the vehicle standing still. Moreover, since a time related parameter of the engine is measured, a dynamic engine characteristic of the engine may be assessed.
The time related parameter of the engine may be e.g. a time span. The time related parameter of the engine may be a time response of the engine, a time span for engine speed to change, a time span for the engine speed to recover from a disturbance, etc. The time related parameter of the engine may be utilised for assessing such engine characteristics as e.g. initial engine torque response, engine torque build-up, and step response. Accordingly, the engine characteristic may be indirectly measured, and assessed by utilising the time related parameter in calculations or correlations of the relevant engine characteristic.
The vehicle may be e.g. a heavy goods vehicle, a lorry, a truck, a pickup, a van, a wheel loader, a bus, a car or other similar motorized manned or unmanned vehicle, designed for land-based propulsion. The transmission may be e.g. a manually shifted transmission, an automated manual transmission (AMT), or an automatic transmission. The output shaft may be indirectly connected to the drive wheels. The connection between the output shaft and the drive wheels may be disconnected by any suitable means. For instance, a transfer gearbox may be provided in the power train between the output shaft and the drive wheels. The transfer gearbox may have a neutral gear. Thus, when the transfer gearbox is in neutral gear and a gear is engaged in the transmission, the output shaft may be rotated by running the engine.
The torque applied by the auxiliary brake may be directly or indirectly given by a measured parameter related to the torque applied by the auxiliary brake. A relevant engine torque may be derived from the accordingly given torque applied by the auxiliary brake by means of a currently used gear ratio of the transmission.
According to embodiments, the step of braking the output shaft with the auxiliary brake may comprise a step of: - applying a constant braking torque. In this manner, e.g. the maximum engine torque or the maximum engine power, for the particular constant engine speed may provide a basis for assessing the engine characteristics.
More specifically, according to some embodiments the method may comprise a step of: - increasing a rotational speed of the engine from a first rotational speed to a second rotational speed, and the step of measuring a parameter related to the auxiliary brake may comprise a step of: - measuring a time span required for increasing the rotational speed of the engine from the first rotational speed to the second rotational speed. In this manner the engine characteristic assessed may be a response time for the engine to increase its rotational speed under load. Thus, a dynamic engine characteristic of the engine may be assessed.
According to an aspect of the invention, there is provided a computer program for performing a method for assessing an engine characteristic of a vehicle, wherein the computer program comprises computer readable code configured to cause a central processing unit to perform a method according to any one aspect and/or embodiment discussed herein.
According to an aspect of the invention, there is provided a computer program product for performing a method for assessing an engine characteristic of a vehicle, wherein the computer program product comprises computer readable code configured to cause a central processing unit of a control unit to perform a method according to any one aspect and/or embodiment discussed herein.
According to an aspect of the invention, there is provided a vehicle comprising a control unit configured to perform a method according to any one aspect and/or embodiment discussed herein.
Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS Various aspects of the invention, including its particular features and advantages, will be readily understood from the example embodiments discussed in the following detailed description and the accompanying drawings, in which: Fig. 1 illustrates a vehicle according to embodiments, Fig. 2 illustrates schematically a powertrain of the vehicle illustrated in Fig. 1, Fig. 3 illustrates a method for assessing an engine characteristic of a vehicle, and Fig. 4 illustrates a computer program product for performing a method for assessing an engine characteristic of a vehicle.
DETAILED DESCRIPTION Aspects of the present invention will now be described more fully. Like numbers refer to like elements throughout. Well-known functions or constructions will not necessarily be described in detail for brevity and/or clarity.Fig.1 illustrates a vehicle 2 according to embodiments. The vehicle 2 illustrated is a heavy goods vehicle but may be any other motorized manned or unmanned vehicle, designed for land-based propulsion. Fig. 2 illustrates schematically a powertrain of the vehicle 2 illustrated inFig.1. The powertrain of the vehicle 2 comprises a combustion engine 4, a transmission 6, a clutch 10, an input shaft 12 of the transmission 6, an output shaft 8 of the transmission 6, a first propeller shaft 14, a second propeller shaft 16, a transfer gearbox 18, and drive axels 20 connected to drive wheels 22 of the vehicle 2. An auxiliary brake 23 is configured to apply a brake torque to the output shaft 8. An actuator (not shown) is provided for opening and closing the clutch 10, and shift actuators (not shown) are provided for shifting gears in the transmission 6 and in the transfer gearbox 18. The actuator of the clutch 10 and/or the shift actuators may be automatically and/or manually operable. The drive wheels 22 are driven by the engine 4 via the transmission 6 and the transfer gearbox 18. The output shaft 8 is indirectly connected to the drive wheels 22 via the transfer gearbox 18, the propeller shafts 14, 18, and the drive axles 20.
The vehicle 2 comprises a control system for controlling various functions related to the operation of the vehicle 2. The control system may comprise one or more control units being arranged for controlling one or more of the various functions. The control system comprises a control unit 24 for controlling one or more functions of the engine 4, and/or the clutch 10, and/or the transmission 6, and/or the transfer gearbox 18. Alternatively, more than one control unit may be provided for controlling the functions of the engine 4, and/or the clutch 10, and/or the transmission 6, and/or the transfer gearbox 18. The actuator of the clutch 10 and the shift actuators may be controlled by the control unit 24. The control unit 24 may for instance control automatically shifting of gears in the transmission 6, and/or in the transfer gearbox 18. The control unit 24 may also be configured to shift gears in the transmission 6, and/or in the transfer gearbox 18 based on input from a driver of the vehicle 2.
The control unit 24 may comprise a programmed central processing unit, an ASIC, an FPGA, or similar. The control unit 24 is configured to perform a method according to any one aspect and/or embodiment discussed herein. Accordingly, the control unit 24 may comprise a memory for storing computer readable code, data tables, and data. An example of a data table may be a table containing the gear ratios of the various gears of the transmission 6. Examples of data may be measured, monitored, and/or calculated data. The control unit 24 is connected to various sensors and actuators in order to receive input and provide output for performing the various aspects and embodiments of method discussed herein. Examples of sensors may be rotational speed sensors of the engine 4, the input shaft 12, the output shaft 8, and of axles of the transmission 6. Examples of actuators are the auxiliary brake 23, the clutch 10, shift actuators of the transmission 6 and the transfer gearbox 18.
According to some embodiments, the control unit 24 may comprise an engine torque measuring arrangement 26 for monitoring and/or calculating and/or estimating an output torque of the engine 4. The engine torque measuring arrangement 26 provides engine torque figures independent of engine torque figures assessed utilising the auxiliary brake 23. Such engine torque measuring arrangements are known in the art and may e.g. estimate engine torque based on the amount of fuel injected into the engine and possibly further parameters such as friction losses in the engine, fuel injection angle. A further example of an engine torque measuring arrangement may estimate engine torque based on measurements from a strain gauge arranged e.g. in the input shaft 12 of the transmission 6.
The auxiliary brake 23 is connected to the control unit 24. An operator, such as a driver of the vehicle 2, applies the auxiliary brake 23 by providing relevant input to the control unit 24. Mentioned purely as an example, input to the control unit 24 for applying of the auxiliary brake 23 may be given via a lever controlled by the operator. For instance, when driving along downhill stretches, the auxiliary brake 23 may be applied instead of service brakes of the vehicle 2 in order to reduce wear of the service brakes.
The auxiliary brake 23 is utilised in aspects and/or embodiments of a method for assessing an engine characteristic of the vehicle 2 discussed herein. The auxiliary brake 23 may be operated by an operator such as a service technician, when the method for assessing an engine characteristic of the vehicle 2 discussed herein is performed.
Fig. 3illustrates a method 100 for assessing an engine characteristic of a vehicle. The vehicle may be a vehicle 2 as discussed above in connection withFigs. 1 and 2.The method 100 comprises steps of: - disconnecting 102 the output shaft from the drive wheels, - rotating 104 the output shaft by running the engine, - braking 106 the output shaft with the auxiliary brake, and - measuring 107 a time related parameter of the engine.
According to embodiments, the method may comprise a step of: - measuring 108 a parameter related to a torque applied by the auxiliary brake. In this manner the control unit 24 may utilise the measured torque applied by the auxiliary brake in order to control the auxiliary brake during performing the method. The torque applied by the auxiliary brake thus, may be verified.
The method 100 for assessing an engine characteristic may be performed with the vehicle standing still. Disconnecting 102 the output shaft from the drive wheels ensures that the drive wheels are not driven when the method 100 is performed, i.e. the purpose of the step: disconnecting 102 the output shaft from the drive wheels is to prevent the drive wheels from being driven by the engine. A parking brake of the vehicle, and/or the service brakes of the vehicle may be applied during performing the method 100.
According to some embodiments at least one dynamic engine characteristic may be assessed. For instance, parameters such as a derivative of engine torque, a derivative of engine speed, a time span for engine speed changes, or a time span for engine torque changes under certain load conditions may be determined. Such parameters may form part of dynamic engine characteristics such as initial engine torque response, engine torque build-up, and step response of the engine and its engine speed controller.
According to embodiments, the step of braking 106 the output shaft with the auxiliary brake may comprise a step of: - applying 142 a constant braking torque.
More specifically, according to some embodiments the method 100 may comprise a step of: - increasing 144 a rotational speed of the engine from a first rotational speed to a second rotational speed, and the step of measuring 107 a time related parameter of the engine may comprise a step of: - measuring 146 a time span required for increasing the rotational speed of the engine from the first rotational speed to the second rotational speed. In this manner the engine characteristic assessed may be a time response of the engine, such as a step response of the engine and its engine speed controller. Which may be useful for evaluating e.g. the engine speed controller.
According to embodiments, the step of rotating 104 the output shaft by running the engine may comprise a step of: - running 148 the engine at a constant rotational speed, wherein the step of braking 106 the output shaft with the auxiliary brake, may comprise a step of: - abruptly increasing 150 a braking torque of the auxiliary brake, and wherein the step of measuring 107 a time related parameter of the engine may comprise a step of: - measuring 152 a time span from the start of the abruptly increasing 150 the braking torque of the auxiliary brake until the engine speed again reaches the constant rotational speed, or - measuring 154 a time span from the start of the abruptly increasing 150 the braking torque of the auxiliary brake until the engine reaches a maximum torque. In this manner an initial engine torque response, and/or an engine torque build-up, of the engine may be determined.
In order to perform the steps of measuring 152 or 154 a time span, the step of running 148 the engine at a constant speed requires an engine speed controller set to attempt to maintain the constant speed also when the engine is loaded by the abruptly increasing 150 the braking torque of the auxiliary brake. The term abruptly increasing a braking torque of the auxiliary brake; entails that the braking torque is increased quicker than the engine and its engine controller is able to compensate in order to maintain the constant rotational speed.
The step of measuring 152 a time span from the start of the abruptly increasing 150 the braking torque of the auxiliary brake until the engine speed again reaches the constant rotational speed may be performed under conditions where the amount of the braking torque applied during the step of abruptly increasing 150 the braking torque of the auxiliary brake is such that the engine is able to reach the constant rotational speed with the braking torque applied. The step of measuring 154 a time span from the start of the abruptly increasing 150 the braking torque of the auxiliary brake until the engine reaches a maximum torque may be performed under conditions where the amount of the braking torque applied during the step of abruptly increasing 150 the braking torque of the auxiliary brake is such that the engine is not able to again reach the initial constant rotational speed with the braking torque applied, but will reach its maximum torque at a lower rotational speed.
The step of running 148 the engine at a constant rotational speed may according to some embodiments, comprise a step of: - rotating 110 the engine at a speed at which the engine develops its maximum torque.
The step of running 148 the engine at a constant rotational speed may according to some embodiments, comprise a step of: - rotating 112 the engine at a speed at which the engine develops its maximum power.
The steps of the method 100 need not necessarily be performed in the order discussed in connection withFig.3. Additional steps may be performed without departing from the invention.
The step of rotating 104 the output shaft 8 by running the engine 4 discussed above may be performed with the clutch 10 engaged and a gear engaged in the transmission 6.
Referring back toFig.2, according to embodiments, the auxiliary brake 23 may comprise a hydraulic retarder.
According to embodiments, the parameter related to a torque applied by the auxiliary brake 23 may comprise a hydraulic pressure produced in a liquid of the hydraulic retarder. The liquid may comprise for instance oil or water.
According to alternative embodiments, the auxiliary brake 23 may comprise an electric retarder.
According to embodiments, the parameter related to a torque applied by the auxiliary brake 23 may comprise a value of an electric current and/or voltage produced in the electric retarder.
Thus, the auxiliary brake 23 comprises a sensor 28 connected to the control unit 24. The sensor 28 is configured for measuring a parameter related to a torque applied by the auxiliary brake 23. The sensor 28 may be e.g. a pressure sensor in case the auxiliary brake 23 comprises a hydraulic retarder, and an electric voltage or current sensor in case the auxiliary brake 23 comprises an electric retarder. The control unit 24 is configured to calculate the brake torque applied by the auxiliary brake 23 from the measured value provided by the sensor 28, or to correlate the measured value from the sensor 28 with a brake torque in a relevant data table. The control unit number 24 may control the auxiliary brake 23 based on the measured value from the sensor 28. Thus, the torque applied by the auxiliary brake 23 may be indirectly given by the measured parameter related to the torque applied by the auxiliary brake 23, and a relevant engine torque may be calculated by means of a currently used gear ratio of the transmission 6, or derived from a relevant data table.
According to alternative embodiments, the engine torque may be derived directly from a data table based on the parameter measured by the sensor 28 and a currently used gear ratio of the transmission 6.
According to alternative embodiments, the sensor 28 may provide actual torque figures from the auxiliary brake 23 to the control unit 24. In such embodiments the parameter related to a torque applied by the auxiliary brake 23 is an actual torque figure of the auxiliary brake 23.
The control unit 24 is configured to execute various calculations in connection with assessing an engine characteristic of the vehicle 2. The control unit 24 may further be configured to apply data from data tables. The control unit 24 is configured to perform a method as discussed above with reference to Fig. 3.
The control unit 24 may comprise a central processing unit configured to run a computer program, wherein the computer program comprises computer readable code configured to cause the central processing unit to perform the method 100 for assessing an engine characteristic of a vehicle according to any one aspect and/or embodiment discussed herein.
Fig. 4illustrates a computer program product 200 for performing a method 100 for assessing an engine characteristic of a vehicle, wherein the computer program product 200 comprises thereon computer readable code configured to cause a central processing unit of a control unit to perform a method 100 according to any one aspect and/or embodiment discussed herein. The computer program product 200 is illustrated in the form of CDROM disc but may be any other kind of computer program storage medium.
It is to be understood that the foregoing is illustrative of various example embodiments and that the invention is defined only by the appended claims. A person skilled in the art will realize that the example embodiments may be modified, and that different features of the example embodiments may be combined to create embodiments other than those described herein, without departing from the scope of the present invention, as defined by the appended claims. For instance, the connection between the output shaft 8 and the drive wheels 22 may be achieved by manually disconnecting the transmission output shaft 8 from the propeller shaft 14, or by manually disconnecting the drive shafts 20 from the propeller shaft 14, or by any suitable means. The method 100 for assessing an engine characteristic of a vehicle may be performed utilising the control unit 24 discussed herein. Alternatively, the method 100 may be performed utilising a control unit independent of the vehicle 2. Such a control unit independent of the vehicle may be provided when servicing the vehicle 2 at a garage, a vehicle service provider, etc. Naturally, in embodiments where the method involves an engine torque measuring arrangement 26 such a control unit independent of the vehicle 2 has to be able to communicate with the engine torque measuring arrangement.

Claims (12)

1. A method (100) for assessing an engine characteristic of a vehicle (2) comprising an engine (4), a transmission (6) connected to the engine (4), an output shaft (8) connected to the transmission (6), an auxiliary brake (23) configured to apply a brake torque to the output shaft (8), and drive wheels (22) driven by the engine (4) via the transmission (6) and the output shaft (8), wherein the method (100) comprises steps of: - disconnecting (102) the output shaft (8) from the drive wheels (22), - rotating (104) the output shaft (8) by running the engine (4), - braking (106) the output shaft (8) with the auxiliary brake (23), and - measuring (107) a time related parameter of the engine (4).
2. The method (100) according to claim 1, comprising a step of: - measuring (108) a parameter related to a torque applied by the auxiliary brake (23).
3. The method (100) according to claim 1 or 2, wherein the auxiliary brake (23) comprises a hydraulic retarder.
4. The method (100) according to claims 2 and 3, wherein the parameter related to a torque applied by the auxiliary brake (23) comprises a hydraulic pressure produced in a liquid of the hydraulic retarder.
5. The method (100) according to claim 1 or 2, wherein the auxiliary brake (23) comprises an electric retarder.
6. The method (100) according to claim 2 and 5, wherein the parameter related to a torque applied by the auxiliary brake (23) comprises a value of an electric current and/or voltage produced in the electric retarder.
7. The method (100) according to any one of claims 1 - 6, wherein the step of braking (106) the output shaft (8) with the auxiliary brake (23) comprises a step of: - applying (142) a constant braking torque.
8. The method (100) according to claim 7, comprises a step of: - increasing (144) a rotational speed of the engine (4) from a first rotational speed to a second rotational speed, and wherein the step of measuring (107) a time related parameter of the engine (4) comprises a step of: - measuring (146) a time span required for increasing the rotational speed of the engine (4) from the first rotational speed to the second rotational speed.
9. The method (100) according to any one of claims 1 - 6, wherein the step of rotating (104) the output shaft (8) by running the engine (4) comprises a step of: - running (148) the engine (4) at a constant rotational speed, wherein the step of braking (106) the output shaft (8) with the auxiliary brake (23), comprises a step of: - abruptly increasing (150) a braking torque of the auxiliary brake (23), and wherein the step of measuring (107) a time related parameter of the engine (4) comprises a step of: - measuring (152) a time span from the start of the abruptly increasing (150) the braking torque of the auxiliary brake (23) until the engine speed again reaches the constant rotational speed, or - measuring (154) a time span from the start of the abruptly increasing (150) the braking torque of the auxiliary brake (23) until the engine (4) reaches a maximum torque.
10. A computer program for performing a method (100) for assessing an engine characteristic of a vehicle (2), wherein the computer program comprises computer readable code configured to cause a central processing unit to perform a method (100) according to any one of the preceding claims.
11. A computer program product (200) for performing a method (100) for assessing an engine characteristic of a vehicle (2), wherein the computer program product (200) comprises computer readable code configured to cause a central processing unit of a control unit to perform a method (100) according to any one of claims 1 - 9.
12. A vehicle (2) comprising a control unit (24) configured to perform a method (100) according to any one of claims 1 - 9.
SE1650140A 2016-02-05 2016-02-05 Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle SE539624C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE1650140A SE539624C2 (en) 2016-02-05 2016-02-05 Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle
DE102017000573.7A DE102017000573B4 (en) 2016-02-05 2017-01-23 Method for judging an engine characteristic and computer program and computer program product and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1650140A SE539624C2 (en) 2016-02-05 2016-02-05 Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle

Publications (2)

Publication Number Publication Date
SE1650140A1 SE1650140A1 (en) 2017-08-06
SE539624C2 true SE539624C2 (en) 2017-10-17

Family

ID=59382390

Family Applications (1)

Application Number Title Priority Date Filing Date
SE1650140A SE539624C2 (en) 2016-02-05 2016-02-05 Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle

Country Status (2)

Country Link
DE (1) DE102017000573B4 (en)
SE (1) SE539624C2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HU185575B (en) 1982-09-29 1985-02-28 Gyoeri Mezoegazdasagi Gepgyart Apparatus for measuring the output power of internal combustion motors, preferably that of tractor and lorry motors
DE4031444A1 (en) 1989-10-04 1991-04-11 Hans Heinrich Holm Eggers Useful power measurer for engine esp. in commercial vehicle - measures torque exerted by electromagnet of eddy current brake
EP2652471B1 (en) 2010-12-15 2019-01-23 Volvo Lastvagnar AB Torque calibration method

Also Published As

Publication number Publication date
DE102017000573A1 (en) 2017-08-10
DE102017000573B4 (en) 2023-01-26
SE1650140A1 (en) 2017-08-06

Similar Documents

Publication Publication Date Title
US8055402B2 (en) Fault-detection methods for motor vehicle gearboxes
JP4853079B2 (en) Vehicle weight detection device for vehicle with fluid coupling
GB2371337A (en) Method for representing the speed of a wheel in motor vehicles
JP5573747B2 (en) Shift control device for hybrid vehicle
US20130066530A1 (en) Method for adapting a contact point of a clutch in a drivetrain of a motor vehicle
JP5570420B2 (en) Control method of dual clutch transmission
KR20120099229A (en) Method for operating an automated parking brake in a motor vehicle
CN101423054A (en) Traction steer detection and compensation
KR20090021291A (en) Method and device for identifying a passive rolling moment of a motor vehicle
US10464566B2 (en) Vehicle powertrain and a method for gear upshifting
CN110191827A (en) For controlling the method and system of vehicle during descending starts
EP2079602B1 (en) A system and a method for controlling an operation of starting a motor vehicle standing still.
GB2327995A (en) Emergency control of an automatic clutch
US7338409B2 (en) Centrifugal clutch assembly with dedicated maneuvering mode
US11040718B2 (en) Launch control method for a vehicle
SE539624C2 (en) Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle
GB2328993A (en) Clutch control unit which controls clutch torque in dependence on engine torque
SE1650139A1 (en) Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle
SE542258C2 (en) A method for clutch torque adaptation, a control unit for clutch torque adaptation, a vehicle comprising such a control unit, a computer program and a computer-readable medium
WO2021121582A1 (en) Method for defining a clutch slipping point position
US10352376B2 (en) Clutch control method of vehicle
US10125827B2 (en) Method of controlling clutch for vehicles
FR3066242B1 (en) METHOD FOR CONTROLLING A MOTORPROOF GROUP FOR THERMAL CONTROL OF A HYDRAULIC CIRCUIT
JP2796800B2 (en) Lock-up clutch hydraulic control device
SE1550347A1 (en) Method and system for preventing engagement of a clutch while a parking brake is applied