AU614780B2 - Control device of electric vehicle - Google Patents
Control device of electric vehicle Download PDFInfo
- Publication number
- AU614780B2 AU614780B2 AU24323/88A AU2432388A AU614780B2 AU 614780 B2 AU614780 B2 AU 614780B2 AU 24323/88 A AU24323/88 A AU 24323/88A AU 2432388 A AU2432388 A AU 2432388A AU 614780 B2 AU614780 B2 AU 614780B2
- Authority
- AU
- Australia
- Prior art keywords
- brake force
- circuit
- electric
- signal
- air
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
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- Braking Systems And Boosters (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Regulating Braking Force (AREA)
Description
S F Ref; 76001 FORM COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952PA COMPLETE SPECIFICATI (OR IGINAL) FOR OFFICE USE: Class Int Class Comlplete Speclflcation Lodged: Accepted: PUbli shed: ~**Priority., 99 99 9* S 9 99 *9 Name and Address of ApptlcantZ *9 0 '9 Address ~Qr $erv1~e~ 90 Mitsubishl Qenkt Kabushli KAIsha 2-3 Marunou~chi 2-hQ'ne Chiyoda-ku Tokyo
JAPAN
Spruson Perguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, Newi South W~ales, 2O00 Auralia 9999 9 9 *999 9 999909 9 9 Complete $P00fl~ti-of for the invention entitled-.
'i ~1 4~ .9 Control Device 6f Electrtc Voht~j1e best Mthod or performing It known to me/us
L
I
-1 ABSTRACT OF THE DISCLOSURE An electric brake circuit is disconnected and the L'rake force instruction signal is supplied to the air brake device directly when an abnormality of processing occurs in the electric brake force control system of an electrie vehicle.
6* SO 0@ 0 99 9 9 9* .9 99 *9 99 0 0 11999 0 0900 00 0 09 S9 99 99 0 90 9 00 9* 0 9 90 9.99 9 0 0909 0 940999 9 9 99 09 0 900 0 99 0 9. 00 1 A CONTROL DEVICE FOR COMBINED ELECTRIC AND AIR BRAKES BACKGROUND OF THE INVENTION The present invention relates to a control device of an electric vehicle which is braked by an electric brake force and an air brake force.
Fig. 2 shows a construction of a conventional control device of an electric vehicle such as disclosed In, Japanese Patent Application tWad-open No. 153650/1984 and,, particularly, shows a circuit for performing an operation for blending an electric brake force and an air brake force.
In thi s figure, the blending operation circuit includes a Power converter 3, a. main motor 4, a current detector 5 for detecting a current flowing through the main motor 4, an aOr brake device 9 and a main control portion, 10 composed of an Input Qconverting circuit I for converting a brake force instruction signal Si given mAnuatly by a vehicle operator Into a, digital signal S2, for example, and an electric V09 0 brake force control circui~t Z responsive to the signal $Z for providinq a control signal S3, The main control portion 10 further Includes an electric brake force operation circuit -o alcul4,tIn5 an electric brake force according to the main motor, current signal S4 deteCted by the current '94 detector and provi~ding an lectric brake force sigVnal 55 corrlesponding thereto, a subtraction circui epniet h lc r bake force signal S2 and the signal $S to provide a difference signal $6 between the.
siqnls Sa and 55 and an Output converter 8 for converting the signal $6 into an analog signal for example, which Is supp)led to the air brake device 9 as an air brake force Instruction signal $7.
.9 the The power convierter 3 responds to the control signal $3 tocn0o thmain electric motor 4 such that the maint motor 4 is used as a generator during a braking period, The main control portion TO may be 30: constructed with a microprocess.or.
*An operation will be described. The brake force Instruction slinal Si inputted by the operator, which may be an analog signal, i~s converted by the Input conyerter 1,I t~ the, main control Portion 10 into ther digital signal S2 representative of the electric brake force, The signal $Z is Inputted to the electric braKe force control circuit Z and oporated therein together with the motor current signal S4 to obtain a sIgnal S3 which Is a gate signal for a thyristereco h oe cov r AV~OW44 2 upon which the power converter 3 controls a voltage and a current to be supplied to the main motor 4 so that the latter works as a generator.
Therefore, a torque is produced by the main motor 4 by which a braking Is realized.
The current signal 54 detected by the current detector 5 is SInputted to the electric brake force operation circuit 6 In which It is converted into the electric brake force signal S which Is supplied to the subtractor circuit 7.
In the subtractor circuit 7, the signal S2 indicative of the nstructed, desired brake force is reduced by the signal S5 Indicative of the electric brake force to obtain a signal $6 indicative of an amount of brake force to be supplemented by air brake force, which is converted by the output converter circuit 8 into an air brake force Instruction signal S7 which is supplied to the air brake device 9. The desired brake force is obtained as a sum of the air brake force and the electric brake force.
A j In this manner, the shortage of the electric brake force Is i* supplemented with the air brake force to obtain the desired brake force, Hhen the electric brake force is reduced for some reason, It Is supplemented with the air brake force, resulting in the desired brake i 20 force.
In the conventional control device constructed as mentioned above in which the operations of the signals In the electric brake force control system are performed by the microprocessor with software, it is j difficult to specify a mode of abnormal processing of the microprocessor, 25 that is, to determine, for example, an abnormal condition such as where i content of the air brake force Instructions signal S7 is zero or maximum. Therefore, there may be a case where it Is impossible to obtain a desired brake force when such abnormality occurs, resulting In Sreliability and safety degraded.
30 5UTa LIJM JLQI1 An object of the present invention is to provide a control device for combined electric and air brakes of an electric vehicle which is always capable of obtainlng a desired brake force and, thus, highly reliable and safe.
Accordingly, the invention comprises a control device for combined electric and air brakes of an electric vehicle having an electric brake circuit including an electric motor operable as a generator for producing j^ r-qtfhk444 i: c T -I -Z L1-C -L .il.- 3 electric brake force and an air brake device utilizing air pressure as air braking force, comprising an operation circuit for obtaining a difference between a predetermined braking force instructed and an electric braking force obtained by said electric brake circuit and, said operation circuit including a main control portion for supplementing the difference with air braking force and a detection circuit for detecting an abnormal proce-tIng in said main control portion for disconnecting said electric braking circuit and supplying air brake force corresponding to the predetermined braking force to said brake device directly, BREFDESCRIPTIQN OF THE DRAWING Fig, 1 shows a Construction of an embodiment of the present invention; and Flg, 2 shows a construction of a conventional control device of an electric vehicle, DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT E An embodiment of the present invention will be described with reference to Fig, 1 which shows a construction of a main portion of a :0 control device of an electric vehicle according to the present invention e in which same reference numerals as those in Fig 2Z depict same or S 2 corresponding portions, respectively, '4 In Fig 1, a main control portion 10 includes a software processing portion 1.a constructed with a microprocessor, a detection circuit 11 for detecting an abnormality of processing of the software processing portion and outputting an abnormality detection signal S8 and output switch 25 circui.ts 12 and 13, The software processing portion 10a includes an input ~converter circuit 1, an electric brake force control circuit 2 for allowing a main motor 4 to operate as a generator through a power conversion circuit 3 and a torque generated thereby to be utilized as an electric brake force, an electric brake force operation circuit 6 for operating the electric brake force obtained by the electric brake force control circuit 2, a subtractor circuit 7 for reducing an instructed, desired brake force by the electric brake force to calculate a shortage of brake force which is to be supplemented and an outout converter circuit 8 The switch circuit 12 operates to selectively dis,)nnect the electric brake force control circuit 2 from the power conversion circuit 3 and the switch circuit 13 operates to selectively supply a brake force instruction signal S7 to an air brake device 9 directly to produce a desired air brake force thereby.
rhk/0444E -4- An operation of this embodiment will be described, Normally, contacts of the respective switch circuits 12 and 13 are in positions shown in Fig.. 1 with which the same operation as that of the conventional device Is performed. That is, the shortage of electric brake force is obtained by the subtractor circuit 7, which is supplemented with air brake force produced by the air brake device 9.
When an abnormality occurs in the main control portion IQ and an abnormality detection signal 58 is, produced by the abnormality detection circuit 11 the switch circuit 12 Is actuated thereby to disc.onnect the electric brake force control circuit 2 from the power conversion circuit 3. Upon this, the power converter circuit 3 is opened to stop. its operation, resulting In Zero electric, brake force, However, the switch circuit 13$ Is actuated simultaneously, so, that, the brake force Instruction signal Sl from the operator Is supplied directly to the air brake device 9. Therefore, It Is possible to brake the vehicle with air brake force even if electric brake force, disappears, by an error.
:In this manner, even If an abnormal signal procesinQ occurs In the :9 *.software portion 10a. of the maini control portion 10, It is always possible to obtain 4, desired brake force and thus the reliability and safety are Improved, In this case 1 the. detection cilrcult 11 for detecting such abnormality of processing may comprise a circuit known, as "watch-dog tinier' cir'Cuit. In the latter case 1 a clock havtln9 a c.onstanlt frquny, i, Used during normal microprocessor operation and bv d Ignin the clock such that it is stopped for a time period exceding a Z$ re~eteniiedtime period when an abnormal processing occurs, it lo, possible to detect the abnormality thereby, Although In the described embodiment, the control systema fol* Vhe power' convertor circuit 3 Is Included In the main control circuit 10, It may be provided in a soparate control device.
Further, the same effect can~ be obtained by using' the brake input instruction sign-al which i5 not analog signal, but a combititon of digital slinals weighted separatoly, As doscribod, according to the presn nenin heeeti brake circuit~ Is disconnected and the brakoe orce instruction signal is Supplied to the air brake device directly, when an abnorm(ality of signal procoesing occurs in the electric brake force control system,. Thor~foro, it Is lways possible to have a desired brake forco, res'ulting In an Improved rel-iab1ity and safoty.
Claims (1)
- 4. A control device for combined electric and air brakes of an Selectric vehicle substantially as herelnbefore described with reference O2 to Figure 1 of the drawings, DATED this THENTY-FIRST day of JUNE 1991 Mitsubishi Denki Kabushiki Kaisha S 9*e Patent Attorneys for the Applicant SPRUSON FERGUSON 0 g 6 eA rbk* /04 rO+444 >4 i
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63-55267 | 1988-03-08 | ||
| JP63055267A JPH07115633B2 (en) | 1988-03-08 | 1988-03-08 | Electric vehicle control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2432388A AU2432388A (en) | 1989-09-14 |
| AU614780B2 true AU614780B2 (en) | 1991-09-12 |
Family
ID=12993832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU24323/88A Ceased AU614780B2 (en) | 1988-03-08 | 1988-10-25 | Control device of electric vehicle |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH07115633B2 (en) |
| AU (1) | AU614780B2 (en) |
| ES (1) | ES2009121A6 (en) |
| IT (1) | IT1223915B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1503261A2 (en) * | 2003-08-01 | 2005-02-02 | Fanuc Ltd | Brake apparatus having braking condition monitoring section |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01308104A (en) * | 1988-06-06 | 1989-12-12 | Mitsubishi Electric Corp | Electrical brake control method for linear motor |
| US6441573B1 (en) * | 2000-04-28 | 2002-08-27 | Daimlercrysler Ag | Blended electrical/friction braking system with electric brake feedback monitor and method of use thereof |
| CN103359133B (en) * | 2013-07-19 | 2015-12-02 | 株洲南车时代电气股份有限公司 | The empty composite brakig control method of electricity of data-transmission mode Network Based and system |
| CN103660965B (en) * | 2013-12-05 | 2016-02-17 | 南车株洲电力机车有限公司 | A kind of constant speed control method of electric locomotive and device |
| CN106004458B (en) * | 2016-05-26 | 2018-11-16 | 爱玛科技集团股份有限公司 | A kind of segmented electric brake control method based on electric vehicle |
| CN106428099B (en) * | 2016-11-22 | 2018-06-22 | 中车株洲电力机车有限公司 | A kind of locomotive and its empty electric composite braking force control method of brake and system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU477931B2 (en) * | 1972-06-21 | 1974-12-19 | Westinghouse Brakes Australia Pty Limited | Brake control apparatus for a blending braking system to reduce effects of relative braking response times |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153650A (en) * | 1983-02-22 | 1984-09-01 | Mitsubishi Electric Corp | Method of braking electric vehicle |
| JPH0411902Y2 (en) * | 1986-03-10 | 1992-03-24 |
-
1988
- 1988-03-08 JP JP63055267A patent/JPH07115633B2/en not_active Expired - Lifetime
- 1988-10-25 AU AU24323/88A patent/AU614780B2/en not_active Ceased
- 1988-11-18 IT IT68027/88A patent/IT1223915B/en active
- 1988-12-02 ES ES8803688A patent/ES2009121A6/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU477931B2 (en) * | 1972-06-21 | 1974-12-19 | Westinghouse Brakes Australia Pty Limited | Brake control apparatus for a blending braking system to reduce effects of relative braking response times |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1503261A2 (en) * | 2003-08-01 | 2005-02-02 | Fanuc Ltd | Brake apparatus having braking condition monitoring section |
| EP1503261A3 (en) * | 2003-08-01 | 2007-07-04 | Fanuc Ltd | Brake apparatus having braking condition monitoring section |
Also Published As
| Publication number | Publication date |
|---|---|
| IT8868027A0 (en) | 1988-11-18 |
| JPH01229758A (en) | 1989-09-13 |
| AU2432388A (en) | 1989-09-14 |
| JPH07115633B2 (en) | 1995-12-13 |
| ES2009121A6 (en) | 1989-08-16 |
| IT1223915B (en) | 1990-09-29 |
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