JPS5639946A - Detector for coefficient of friction of road surface - Google Patents

Detector for coefficient of friction of road surface

Info

Publication number
JPS5639946A
JPS5639946A JP11279479A JP11279479A JPS5639946A JP S5639946 A JPS5639946 A JP S5639946A JP 11279479 A JP11279479 A JP 11279479A JP 11279479 A JP11279479 A JP 11279479A JP S5639946 A JPS5639946 A JP S5639946A
Authority
JP
Japan
Prior art keywords
wheel
coefficient
friction
road surface
deceleration
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.)
Pending
Application number
JP11279479A
Other languages
Japanese (ja)
Inventor
Toshiro Matsuda
Minoru Honda
Akira Fukano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP11279479A priority Critical patent/JPS5639946A/en
Publication of JPS5639946A publication Critical patent/JPS5639946A/en
Pending legal-status Critical Current

Links

Landscapes

  • Regulating Braking Force (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Abstract

PURPOSE: To detect a value of coefficient of friction of road surface μ from an equation of motion of wheels based on an electric signal corresponding to each of wheel speed acceleration and deceleration, a brake torque, and a wheel load.
CONSTITUTION: A wheel acceleration and deceleration speed detecting part 1 differentiates a wheel angle speed signal ω obtained by a wheel speed sensor and generates electric signals corresponding to wheel acceleration and deceleration rates. A brake torque detecting part 2 detects a brake hydraulic pressure in a wheel cylinder and generates electric signals of which size corresponds to a brake torque. Then, a wheel load detecting part 3 generates electric signals corresponding to the wheel load per each wheel including load shift at braking by measuring bending of a suspension spring by a strain gauge, and the output signals from these detecting parts 1W3 are input to a computing device 4 for coefficient of friction of road surface μ to calculate an instantaneous value of the coefficient from an equation of motion of wheels.
COPYRIGHT: (C)1981,JPO&Japio
JP11279479A 1979-09-05 1979-09-05 Detector for coefficient of friction of road surface Pending JPS5639946A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11279479A JPS5639946A (en) 1979-09-05 1979-09-05 Detector for coefficient of friction of road surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11279479A JPS5639946A (en) 1979-09-05 1979-09-05 Detector for coefficient of friction of road surface

Publications (1)

Publication Number Publication Date
JPS5639946A true JPS5639946A (en) 1981-04-15

Family

ID=14595674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11279479A Pending JPS5639946A (en) 1979-09-05 1979-09-05 Detector for coefficient of friction of road surface

Country Status (1)

Country Link
JP (1) JPS5639946A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6331869A (en) * 1986-07-25 1988-02-10 Mazda Motor Corp Slip controller for automobile
JPS63242758A (en) * 1987-03-31 1988-10-07 Aisin Seiki Co Ltd Four-wheel brake control device for vehicle
JPH03504706A (en) * 1988-04-07 1991-10-17 オッドバード　ヨーンセン　アクスイェ　セルスカプ Method and system for non-lock and non-skid braking/traction of wheels
US5176431A (en) * 1991-06-27 1993-01-05 Allied-Signal Inc. Vehicle deceleration prediction based on vehicle dive
JPH0539018A (en) * 1991-08-02 1993-02-19 Nippon Denshi Kogyo Kk Anti-lock braking device
US5333943A (en) * 1991-03-25 1994-08-02 Japan Electronic Control Systems Co., Ltd. Method and system for anti-lock braking in automobile by measuring brake torque
JPH07156779A (en) * 1993-12-09 1995-06-20 Kawasaki Heavy Ind Ltd Method and device for torque-controlling anti skid braking
US5443583A (en) * 1991-05-23 1995-08-22 Jidosha Kiki Co., Ltd. Method for judging friction coefficient of road surface and method for anti-skid brake control using said method
US5892139A (en) * 1988-10-13 1999-04-06 Japan Electronics Industry, Limited Road surface friction sensor and coefficient detector
US6048038A (en) * 1995-03-09 2000-04-11 Itt Manufacturing Enterprieses, Inc. Breaking pressure regulator
WO2003008246A1 (en) * 2001-07-19 2003-01-30 Bridgestone Corporation Road surface friction coefficient estimating method, signal multiplex transmission method and signal multiplex transmission device
CN113218858A (en) * 2021-05-12 2021-08-06 西安航空制动科技有限公司 Method for evaluating friction coefficient of brake material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52141681A (en) * 1976-03-31 1977-11-26 Saab Scania Ab Measuring car

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52141681A (en) * 1976-03-31 1977-11-26 Saab Scania Ab Measuring car

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6331869A (en) * 1986-07-25 1988-02-10 Mazda Motor Corp Slip controller for automobile
JPS63242758A (en) * 1987-03-31 1988-10-07 Aisin Seiki Co Ltd Four-wheel brake control device for vehicle
JPH03504706A (en) * 1988-04-07 1991-10-17 オッドバード　ヨーンセン　アクスイェ　セルスカプ Method and system for non-lock and non-skid braking/traction of wheels
US5892139A (en) * 1988-10-13 1999-04-06 Japan Electronics Industry, Limited Road surface friction sensor and coefficient detector
US5333943A (en) * 1991-03-25 1994-08-02 Japan Electronic Control Systems Co., Ltd. Method and system for anti-lock braking in automobile by measuring brake torque
US5443583A (en) * 1991-05-23 1995-08-22 Jidosha Kiki Co., Ltd. Method for judging friction coefficient of road surface and method for anti-skid brake control using said method
US5176431A (en) * 1991-06-27 1993-01-05 Allied-Signal Inc. Vehicle deceleration prediction based on vehicle dive
JPH0539018A (en) * 1991-08-02 1993-02-19 Nippon Denshi Kogyo Kk Anti-lock braking device
JPH07156779A (en) * 1993-12-09 1995-06-20 Kawasaki Heavy Ind Ltd Method and device for torque-controlling anti skid braking
US6048038A (en) * 1995-03-09 2000-04-11 Itt Manufacturing Enterprieses, Inc. Breaking pressure regulator
WO2003008246A1 (en) * 2001-07-19 2003-01-30 Bridgestone Corporation Road surface friction coefficient estimating method, signal multiplex transmission method and signal multiplex transmission device
CN113218858A (en) * 2021-05-12 2021-08-06 西安航空制动科技有限公司 Method for evaluating friction coefficient of brake material

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