SE1650139A1 - 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

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Publication number
SE1650139A1
SE1650139A1 SE1650139A SE1650139A SE1650139A1 SE 1650139 A1 SE1650139 A1 SE 1650139A1 SE 1650139 A SE1650139 A SE 1650139A SE 1650139 A SE1650139 A SE 1650139A SE 1650139 A1 SE1650139 A1 SE 1650139A1
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SE
Sweden
Prior art keywords
engine
torque
auxiliary brake
output shaft
vehicle
Prior art date
Application number
SE1650139A
Other languages
Swedish (sv)
Other versions
SE539623C2 (en
Inventor
Molin Patrik
Original Assignee
Scania Cv Ab
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Filing date
Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1650139A priority Critical patent/SE539623C2/en
Priority to DE102017000535.4A priority patent/DE102017000535A1/en
Publication of SE1650139A1 publication Critical patent/SE1650139A1/en
Publication of SE539623C2 publication Critical patent/SE539623C2/en

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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
    • 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
    • G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
    • 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
    • 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

Abstract

ABSTRACT Herein a method (100) for assessing an engine characteristic of a vehicle comprising anengine, a transmission connected to the engine, an output shaft connected to thetransmission, an auxiliary brake configured to apply a brake torque to the output shaft, anddrive wheels driven by the engine. 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 (108) a parameter related to a torque applied by the auxiliary brake. Elected for publication: Fig. 3

Description

1 Method for Assessing Engine Characteristic and Computer Program andComputer 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 forassessing an engine characteristic of a vehicle, and to a computer program product forperforming a method for assessing an engine characteristic of a vehicle. The presentinvention also relates to a vehicle comprising a control unit configured to perform a methodfor assessing an engine characteristic.
BACKGROUND lt is desirable to measure and/or verify engine characteristics and/or engine performance of avehicle engine. The engine characteristics may for instance relate to an engine torqueprovided 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 Ioader, a bus, a car or other similar motorized manned orunmanned vehicle, designed for land-based propulsion.
The engine torque may be measured using various methods. For instance, the vehicle maybe driven on a chassis dynamometer, which brakes the driven wheels of the vehicle e.g. witha constant torque in order to measure an engine torque produced by the engine of thevehicle.
US 2014/0148993 discloses a method for verifying an engine torque estimation utilisingestimated vehicle weight values. The method includes estimating the engine torque based onthe amount of fuel injected into the engine, where the engine torque is obtained from a fuelinjection table, estimating a first vehicle weight value by a calculation based on accelerationof the vehicle and the estimated engine torque, estimating an auxiliary brake torque by usingan auxiliary brake table, estimating a second vehicle weight value by a calculation based onthe estimated auxiliary brake torque. The first vehicle weight value is compared with thesecond vehicle weight value. lf the vehicle weight value resulting from the brake torqueestimation, i.e. the second vehicle weight, is higher than the vehicle weight value resultingfrom the engine torque estimation, i.e. the first vehicle weight, by a predefined factor, it canbe assumed that the engine control parameters have been manipulated. The predefinedfactor used is dependent on different environmental and vehicle parameters, but should behigher than the tolerances for both the engine torque estimation and the brake torque 2 estimation. The method assists in detecting if an actual engine torque value deviates fromthe original engine torque value of a vehicle without measuring the engine torque with aseparate torque sensor.
SUMMARY lt is an object of the present invention to provide a method for assessing an enginecharacteristic of an engine of a vehicle, independently of a control system dedicated to thecontrol of the engine of the vehicle.
According to an aspect of the invention, the object is achieved by a method for assessing anengine characteristic of a vehicle comprising an engine, a transmission connected to theengine, an output shaft connected to the transmission, an auxiliary brake configured to applya brake torque to the output shaft, and drive wheels driven by the engine via the transmissionand 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 parameter related to a torque applied by the auxiliary brake.
Since the output shaft is disconnected from the drive wheels during performing of the methodand a parameter related to a torque applied by the auxiliary brake is measured, no chassisdynamometer is required for assessing the engine characteristics of the vehicle. Moreover,measuring the parameter related to the torque applied by the auxiliary brake ensures that theengine characteristic is assessed by a system different than a dedicated engine controlsystem of the vehicle. As a result, the above mentioned object is achieved. Further, since theoutput shaft is disconnected from the drive wheels, the engine characteristic of the vehiclemay be assessed with the vehicle standing still.
The parameter related to a torque applied by the auxiliary brake correlates with enginecharacteristics such as e.g. engine torque, engine power, etc. Thus, according to the presentinvention an engine characteristic may be assessed by measuring the parameter related to atorque applied to the auxiliary brake. Accordingly, the engine characteristic may be indirectlymeasured, and assessed by utilising the parameter in calculations or correlations of therelevant engine characteristic.
The vehicle may be e.g. a heavy goods vehicle, a lorry, a truck, a pickup, a van, a wheelloader, a bus, a car or other similar motorized manned or unmanned vehicle, designed for 3 land-based propulsion. The transmission may be e.g. a manually shifted transmission, anautomated manual transmission (AMT), or an automatic transmission. The output shaft maybe indirectly connected to the drive wheels. The connection between the output shaft and thedrive wheels may be disconnected by any suitable means. For instance, a transfer gearboxmay be provided in the power train between the output shaft and the drive wheels. Thetransfer gearbox may have a neutral gear. Thus, when the transfer gearbox is in neutral gearand a gear is engaged in the transmission, the output shaft may be rotated by running the engine.
According to the method an engine characteristic, such as e.g. a torque of the engine, maybe assessed. The torque applied by the auxiliary brake may be directly or indirectly given bythe measured parameter related to the torque applied by the auxiliary brake. A relevantengine torque may be derived from the accordingly given torque applied by the auxiliarybrake by means of a currently used gear ratio of the transmission.
According to embodiments, the step of rotating the output shaft by running the engine maycomprise a step of: - running the engine at a constant engine speed, and the step of braking the output shaft withthe auxiliary brake may comprise a step of: - gradually applying a braking torque with the auxiliary brake. ln this manner, e.g. themaximum torque, for the particular constant engine speed may be assessed.
More specifically, according to some embodiments the step of measuring a parameterrelated to the auxiliary brake may comprise a step of: - recording a torque of the auxiliary brake when the engine speed starts to drop from theconstant engine speed. ln this manner the torque applied by the auxiliary brake, at which theengine speed starts to drop may be assessed, and which corresponds to a particular enginetorque and a particular engine power provided at the particular constant engine speed.
According to embodiments, the vehicle may comprise an engine torque measuringarrangement, the engine torque measuring arrangement providing engine torque figuresindependent of the step of measuring a parameter related to the auxiliary brake. The methodmay comprise a step of: - measuring an engine torque figure with the engine torque measuring arrangement. ln thismanner the engine torque figure measured with the engine torque measuring arrangementmay be compared with the engine characteristic assessed utilising the measured parameterrelated to the torque applied by the auxiliary brake. This may be repeated at various engine 4 speeds. The engine torque measuring arrangement may be calibrated based on themeasured parameter related to the torque applied by the auxiliary brake.
According to an aspect of the invention, there is provided a computer program for performinga 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 forperforming a method for assessing an engine characteristic of a vehicle, wherein thecomputer program product comprises computer readable code configured to cause a centralprocessing unit of a control unit to perform a method according to any one aspect and/orembodiment discussed herein.
According to an aspect of the invention, there is provided a vehicle comprising a control unitconfigured 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 whenstudying 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 bereadily understood from the example embodiments discussed in the following detaileddescription 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 anengine characteristic of a vehicle.
DETAILED DESCRIPTION Aspects of the present invention will now be described more fully. Like numbers refer to likeelements throughout. Well-known functions or constructions will not necessarily be describedin detail for brevity and/or clarity. 5 Fig. 1 illustrates a vehicle 2 according to embodiments. The vehicle 2 illustrated is a heavygoods vehicle but may be any other motorized manned or unmanned vehicle, designed forland-based propulsion.
Fig. 2 illustrates schematically a powertrain of the vehicle 2 illustrated in Fig. 1. Thepowertrain 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 firstpropeller shaft 14, a second propeller shaft 16, a transfer gearbox 18, and drive axels 20connected to drive wheels 22 of the vehicle 2. An auxiliary brake 23 is configured to apply abrake torque to the output shaft 8. An actuator (not shown) is provided for opening andclosing the clutch 10, and shift actuators (not shown) are provided for shifting gears in thetransmission 6 and in the transfer gearbox 18. The actuator of the clutch 10 and/or the shiftactuators may be automatically and/or manually operable. The drive wheels 22 are driven bythe engine 4 via the transmission 6 and the transfer gearbox 18. The output shaft 8 isindirectly connected to the drive wheels 22 via the transfer gearbox 18, the propeller shafts14, 18, and the drive axles 20.
The vehicle 2 comprises a control system for controlling various functions related to theoperation of the vehicle 2. The control system may comprise one or more control units beingarranged for controlling one or more of the various functions. The control system comprises acontrol 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 onecontrol unit may be provided for controlling the functions of the engine 4, and/or the clutch10, and/or the transmission 6, and/or the transfer gearbox 18. The actuator of the clutch 10and the shift actuators may be controlled by the control unit 24. The control unit 24 may forinstance control automatic shifting of gears in the transmission 6, and/or in the transfergearbox 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 aspectand/or embodiment discussed herein. Accordingly, the control unit 24 may comprise amemory for storing computer readable code, data tables, and data. An example of a datatable 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 24is 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 6 sensors may be rotational speed sensors of the engine 4, the input shaft 12, the output shaft8, and of axles of the transmission 6. Examples of actuators are the auxiliary brake 23, theclutch 10, shift actuators of the transmission 6 and the transfer gearbox 18.
According to some embodiments, the control unit 24 may comprise an engine torquemeasuring arrangement 26 for monitoring and/or calculating and/or estimating an outputtorque of the engine 4. The engine torque measuring arrangement 26 provides engine torquefigures independent of engine torque figures assessed utilising the auxiliary brake 23 asdiscussed herein. Such engine torque measuring arrangements are known in the art andmay e.g. estimate engine torque based on the amount of fuel injected into the engine andpossibly further parameters such as friction Iosses in the engine, fuel injection angle. Afurther example of an engine torque measuring arrangement may estimate engine torquebased 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 ofthe 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 auxiliarybrake 23 may be given via a lever controlled by the operator. For instance, when drivingalong downhill stretches, the auxiliary brake 23 may be applied instead of service brakes ofthe 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 assessingan engine characteristic of the vehicle 2 discussed herein. The auxiliary brake 23 may beoperated by an operator such as a service technician, when the method for assessing anengine characteristic of the vehicle 2 discussed herein is performed.
Fig. 3 illustrates a method 100 for assessing an engine characteristic of a vehicle. Thevehicle may be a vehicle 2 as discussed above in connection with Figs. 1 and 2. Themethod 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 108 a parameter related to a torque applied by the auxiliary brake.
The method 100 for assessing an engine characteristic may be performed with the vehiclestanding still. Disconnecting 102 the output shaft from the drive wheels ensures that the drive 7 wheels are not driven when the method 100 is performed, i.e. the purpose of the stepdisconnecting 102 the output shaft from the drive wheels is to prevent the drive wheels frombeing driven by the engine. A parking brake of the vehicle, and/or the service brakes of thevehicle may be applied during performing the method 100.
According to embodiments, the step of rotating 104 the output shaft by running the enginemay comprise a step of:- rotating 110 the engine at a speed at which the engine develops its maximum torque.
According to embodiments, the step of rotating 104 the output shaft by running the enginemay comprise a step of:- rotating 112 the engine at a speed at which the engine develops its maximum power.
The step of rotating 104 the output shaft by running the engine may comprise a step of: - running 114 the engine at a constant engine speed, and the step of braking 106 the outputshaft with the auxiliary brake may comprise a step of: - gradually applying 1 16 a braking torque with the auxiliary brake.
The step of running 114 the engine at a constant engine speed may be e.g. a constantengine speed according to the step of rotating 110 the engine at a speed at which the enginedevelops its maximum torque, or according to the step of rotating 112 the engine at thespeed at which the engine develops its maximum power.
According to embodiments the step of measuring 108 a parameter related to the auxiliarybrake may comprise a step of: - recording 118 a torque of the auxiliary brake when the engine speed starts to drop from theconstant engine speed. The maximum torque developed by the engine, or the maximumpower developed by the engine, at which the engine speed starts to drop thus, may beassessed.
According to embodiments where the vehicle comprises an engine torque measuringarrangement as discussed above, the method 100 may comprise a step of: - measuring 120 an engine torque figure with the engine torque measuring arrangement.
According to embodiments where the vehicle comprises an engine torque measuringarrangement as discussed above, the step of rotating 104 the output shaft with the enginemay comprise a step of: 8 - running 122 the engine at a constant engine speed, wherein the step of braking 106 theoutput shaft with the auxiliary brake may comprise steps of: - braking 124 the output shaft with a first braking torque, and thereafter - braking 126 the output shaft with a second braking torque, wherein the step of measuring108 a parameter related to the auxiliary brake may comprise steps of: - recording 128 a first torque figure of the auxiliary brake at the first braking torque, and - recording 130 a second torque figure of the auxiliary brake at the second braking torque,and wherein the step of measuring 120 an engine torque figure with the engine torquemeasuring arrangement may comprise steps of: - recording 132 a first engine torque figure from the engine torque measuring arrangement atthe first braking torque, and - recording 134 a second engine torque figure from the engine torque measuringarrangement at the second braking torque. ln this manner a comparison matrix may be provided over the engine torque provided by theengine torque measuring arrangement and the engine torque derived from the torque of theauxiliary brake.
According to some embodiments, the method 100 may further comprise steps of: - comparing 136 the recorded first torque figure of the auxiliary brake at the first brakingtorque with the recorded first engine torque figure, and - comparing 138 the recorded second torque figure of the auxiliary brake at the secondbraking torque with the recorded second engine torque figure. ln this manner the steps ofcomparing 136, 138 may provide a basis for verifying the first and second engine torquefigures, and accordingly for adjusting engine torque figures measured by the engine torquemeasuring arrangement utilising the torque figures of the auxiliary brake.
According to embodiments, the method 100 may comprise a step of: - repeating 140, at a different constant engine speed, the steps of: - running the engine 122 at a constant engine speed, - braking 124 the output shaft with a first braking torque, and thereafter - braking 126 the output shaft with a second braking torque, - recording 128 a torque figure of the auxiliary brake at the first braking torque, and - recording 130 a torque figure of the auxiliary brake at the second braking torque, - recording 132 a first engine torque figure from the engine torque measuring arrangement atthe first braking torque, and 9 - recording 134 a second engine torque figure from the engine torque measuringarrangement at the second braking torque.
The steps of the method 100 need not necessarily be performed in the order discussed inconnection with Fig. 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 beperformed with the clutch 10 engaged and a gear engaged in the transmission 6.
Referring back to Fig. 2, according to embodiments, the auxiliary brake 23 may comprise ahydraulic retarder, and the parameter related to a torque applied by the auxiliary brake 23comprises 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 electricretarder, and the parameter related to a torque applied by the auxiliary brake 23 comprises avalue 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. Thesensor 28 is configured for measuring a parameter related to a torque applied by theauxiliary brake 23. The sensor 28 may be e.g. a pressure sensor in case the auxiliary brake23 comprises a hydraulic retarder, and an electric voltage or current sensor in case theauxiliary brake 23 comprises an electric retarder. The control unit 24 is configured tocalculate the brake torque applied by the auxiliary brake 23 from the measured valueprovided by the sensor 28, or to correlate the measured value from the sensor 28 with abrake torque in a relevant data table. The control unit number 24 may control the auxiliarybrake 23 based on the measured value from the sensor 28. Thus, the torque applied by theauxiliary brake 23 may be indirectly given by the measured parameter related to the torqueapplied by the auxiliary brake 23, and a relevant engine torque may be calculated by meansof 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 datatable based on the parameter measured by the sensor 28 and a currently used gear ratio ofthe transmission 6.
According to alternative embodiments, the sensor 28 may provide actual torque figures fromthe auxiliary brake 23 to the control unit 24. ln such embodiments the parameter related to atorque 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 assessingan engine characteristic of the vehicle 2. The control unit 24 may further be configured toapply data from data tables. The control unit 24 is configured to perform a method asdiscussed above with reference to Fig. 3.
The control unit 24 may comprise a central processing unit configured to run a computerprogram, wherein the computer program comprises computer readable code configured tocause the central processing unit to perform the method 100 for assessing an enginecharacteristic of a vehicle according to any one aspect and/or embodiment discussed herein.
Fig. 4 illustrates a computer program product 200 for performing a method 100 for assessingan engine characteristic of a vehicle, wherein the computer program product 200 comprisesthereon computer readable code configured to cause a central processing unit of a controlunit to perform a method 100 according to any one aspect and/or embodiment discussedherein. The computer program product 200 is illustrated in the form of CDROIVI disc but maybe any other kind of computer program storage medium. lt is to be understood that the foregoing is illustrative of various example embodiments andthat the invention is defined only by the appended claims. A person skilled in the art willrealize that the example embodiments may be modified, and that different features of theexample embodiments may be combined to create embodiments other than those describedherein, without departing from the scope of the present invention, as defined by theappended claims. For instance, the connection between the output shaft 8 and the drivewheels 22 may be achieved by manually disconnecting the transmission output shaft 8 fromthe propeller shaft 14, or by manually disconnecting the drive shafts 20 from the propellershaft 14, or by any suitable means. The method 100 for assessing an engine characteristic ofa vehicle may be performed utilising the control unit 24 discussed herein. Alternatively, themethod 100 may be performed utilising a control unit independent of the vehicle 2. Such acontrol unit independent of the vehicle may be provided when servicing the vehicle 2 at agarage, a vehicle service provider, etc. Naturally, in embodiments where the method involves 11 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 (14)

1. A method (100) for assessing an engine characteristic of a vehicle (2) comprising anengine (4), a transmission (6) connected to the engine (4), an output shaft (8) connected tothe transmission (6), an auxiliary brake (23) configured to apply a brake torque to the outputshaft (8), and drive wheels (22) driven by the engine (4) via the transmission (6) and theoutput 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 (108) a parameter related to a torque applied by the auxiliary brake (23).
2. The method (100) according to claim 1, wherein the auxiliary brake (23) comprises ahydraulic retarder, and wherein the parameter related to a torque applied by the auxiliarybrake (23) comprises a hydraulic pressure produced in a liquid of the hydraulic retarder.
3. The method (100) according to claim 1, wherein the auxiliary brake (23) comprises anelectric retarder, and 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.
4. The method (100) according to any one of the preceding claims, wherein the step ofrotating (104) the output shaft (8) by running the engine (4) comprises a step of: - (1 10) the engine (4) at a speed at which the engine (4) develops itsmaximum torque.
5. The method (100) according to any one of claims 1 - 3, wherein the step of rotating (104)the output shaft (8) by running the engine (4) comprises a step of:- unnmg-r-etating (112) the engine (4) at a speed at which the engine (4) develops its maximum power.
6. The method (100) according to any one of the preceding claims, wherein the step ofrotating (104) the output shaft (8) by running the engine (4) comprises a step of: - running (114) the engine (4) at a constant engine speed, and wherein the step of braking(106) the output shaft (8) with the auxiliary brake (23) comprises a step of: - gradually applying (116) a braking torque with the auxiliary brake (23).
7. The method (100) according to claim 6, wherein the step of measuring (108) a parameterrelated to the auxiliary brake (23) comprises a step of: 2 - recording (118) a torque of the auxiliary brake (23) when the engine speed starts to dropfrom the constant engine speed.
8. The method (100) according to any one of the preceding claims, wherein the vehicle (2)comprises an engine torque measuring arrangement (26), the engine torque measuringarrangement (26) providing engine torque figures independent of the step of measuring (108)a parameter related to the auxiliary brake (23), wherein the method (100) comprises a stepof: - measuring (120) an engine torque figure with the engine torque measuring arrangement(26).
9. The method (100) according to claim 8, wherein the step of rotating (104) the output shaft(8) with the engine (4) comprises a step of: - running (122) the engine (4) at a constant engine speed, wherein the step of braking (106)the output shaft (8) with the auxiliary brake (23) comprises steps of: - braking (124) the output shaft (8) with a first braking torque, and thereafter - braking (126) the output shaft (8) with a second braking torque, wherein the step ofmeasuring (108) a parameter related to the auxiliary brake (23) comprises steps of: - recording (128) a first torque figure of the auxiliary brake (23) at the first braking torque, and- recording (130) a second torque figure of the auxiliary brake (23) at the second brakingtorque, and wherein the step of measuring (120) an engine torque figure with the enginetorque measuring arrangement (26) comprises steps of: - recording (132) a first engine torque figure from the engine torque measuring arrangement(26) at the first braking torque, and - recording (134) a second engine torque figure from the engine torque measuringarrangement (26) at the second braking torque.
10. The method (100) according to claim 9, comprising: - comparing (136) the recorded first torque figure of the auxiliary brake (23) at the firstbraking torque with the recorded first engine torque figure, and - comparing (138) the recorded second torque figure of the auxiliary brake (23) at the secondbraking torque with the recorded second engine torque figure.
11. The method (100) according to claim 9 or 10, comprising:- repeating (140) the steps of claim 9 at a different constant engine speed. 3
12. A computer program for performing a method (100) for assessing an enginecharacteristic of a vehicle (2), wherein the computer program comprises computer readablecode configured to cause a central processing unit to perform a method (100) according to any one of the preceding claims.
13. A computer program product (200) for performing a method (100) for assessing anengine characteristic of a vehicle (2), wherein the computer program product (200)comprises computer readable code configured to cause a central processing unit of a controlunit to perform a method (100) according to any one of claims 1 - 11.
14. A vehicle (2) comprising a control unit configured to perform a method (100) according to any one of claims 1 -11.
SE1650139A 2016-02-05 2016-02-05 Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle SE539623C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE1650139A SE539623C2 (en) 2016-02-05 2016-02-05 Method for Assessing Engine Characteristic and Computer Program and Computer Program Product and Vehicle
DE102017000535.4A DE102017000535A1 (en) 2016-02-05 2017-01-20 Method for evaluating an engine characteristic and computer program and computer program product and vehicle

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