US20010020209A1 - Method and device for detecting cornering of a vehicle - Google Patents
Method and device for detecting cornering of a vehicle Download PDFInfo
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- US20010020209A1 US20010020209A1 US09/747,256 US74725600A US2001020209A1 US 20010020209 A1 US20010020209 A1 US 20010020209A1 US 74725600 A US74725600 A US 74725600A US 2001020209 A1 US2001020209 A1 US 2001020209A1
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001133 acceleration Effects 0.000 claims abstract description 14
- 238000010586 diagram Methods 0.000 description 5
- 230000004069 differentiation Effects 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
-
- 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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18145—Cornering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/56—Devices characterised by the use of electric or magnetic means for comparing two speeds
-
- 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
- B60T2210/00—Detection or estimation of road or environment conditions; Detection or estimation of road shapes
- B60T2210/20—Road shapes
- B60T2210/24—Curve radius
-
- 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
- B60T2250/00—Monitoring, detecting, estimating vehicle conditions
- B60T2250/04—Vehicle reference speed; Vehicle body speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/12—Lateral speed
- B60W2520/125—Lateral acceleration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2520/00—Input parameters relating to overall vehicle dynamics
- B60W2520/28—Wheel speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/20—Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2552/00—Input parameters relating to infrastructure
- B60W2552/30—Road curve radius
Definitions
- the present invention relates to a method and a device for detecting cornering of a vehicle.
- a method i.e. such a device detects a signal that indicates cornering.
- a signal that indicates cornering can be the curve radius, the transverse acceleration, or a signal containing comparable information.
- Methods for detecting cornering are described, for example, in EP 0 377 645 B1 and EP 0 376 984 B1. Under certain conditions, it has been shown that these methods do not indicate cornering with enough precision. This is especially true in vehicles equipped with an anti-lock braking system (ABS), a traction control system (TCS), or an electronic stability program (ESP). Further details regarding ABS, TCS, and ESP can be taken, e.g.
- the known methods for detecting cornering can often not determine cornering precisely enough at wheels or axles, at which measures influencing operating dynamics are implemented, such as braking actions, ABS control actions, TCS control actions, or control actions from an electronic stability program.
- measures influencing operating dynamics such as braking actions, ABS control actions, TCS control actions, or control actions from an electronic stability program.
- This is also apparent in the case of braking on a so-called split-friction road surface, i.e. roadways having a different coefficient of friction on the left and right sides of the vehicle.
- the known method cannot reliably differentiate such braking from braking while cornering.
- the object of the present invention is to provide an improved method and device for detecting cornering of a vehicle.
- the object of the present invention is achieved by a method according to claim 1 , and by a device according to claim 11 .
- a signal indicating vehicle cornering, a measure of the curve radius, or the transverse acceleration of the vehicle is determined in this case, using a reference speed for at least one side of the vehicle; a reference speed of a side of the vehicle being determined as a function of the deceleration of at least one wheel on this side of the vehicle.
- an example of a signal indicating cornering of the vehicle can be the curve radius, the transverse acceleration of the vehicle, or the difference of the reference speeds of the two sides of the vehicle. In this manner, cornering is clearly detected more precisely, and in particular, more reliably.
- the speed of the wheel is ascertained, e.g. measured, and the deceleration of the wheel is determined by differentiating the wheel speed with respect to time.
- the reference speed of the wheel is set equal to the speed of the wheel, when the deceleration of the wheel is less than or (essentially) equal to the deceleration of the vehicle, after the vehicle deceleration is increased by means of a weighting value.
- the reference speed of the wheel is interpolated, when the deceleration of the wheel is greater than the deceleration of the vehicle, after the vehicle deceleration is increased by means of a weighting value.
- the reference speed is interpolated according to the equation
- v s,neu is the interpolated value of the reference speed
- v s,alt is the previous value of the reference speed
- ⁇ is a constant, which is advantageously the weighting value
- a fz is the deceleration of the vehicle
- ⁇ t is the cycle time for the interpolation.
- the deceleration of the vehicle is multiplied by the weighting value.
- the weighting value is formed as a function of the driving situation.
- the weighting value assumes a value between 1.3 and 1.5 in response to sharp deceleration of the vehicle, and a value between 1.0 and 1.2 in response to low deceleration of the vehicle.
- the reference speed of the wheel is set equal to the speed of the wheel, when the speed of the wheel is greater than or essentially equal to the wheel reference speed obtained by interpolation.
- the speed of at least two vehicle wheels is ascertained, e.g. measured, and the reference speed of each side of the vehicle is ascertained, the reference speed of a wheel being determined as a function of the deceleration of the fastest wheel of the side.
- FIG. 1 an exemplary embodiment for calculating the reference speed
- FIG. 2 a speed-distance diagram
- FIG. 3 a speed-distance diagram
- FIG. 4 means for detecting a signal indicating cornering.
- FIG. 1 shows an exemplary embodiment for calculating reference speed v S for a side of a vehicle.
- a first step 1 the current speed of the wheel or wheels on one side of a vehicle is read in. If the speed of only one wheel is read in, then this speed is designated by V R .
- V R the speed of the wheel or wheels on one side of a vehicle.
- an advantageous further refinement provides for reading in the speeds of all or both wheels on a side of a vehicle. In this case, it is also determined in step 1 , which of these wheels on one side has the highest speed. The highest speed is then value v R . Therefore, this highest speed is likewise designated as the wheel speed in the subsequent explanation of FIG. 1.
- v R is differentiated.
- the differentiation is not performed by a pure derivative-action element, but rather by a DT 1 element or a DT 2 element.
- step 1 vehicle deceleration a fz is also read in.
- the value for the vehicle deceleration can be obtained, e.g. using a low-pass-filtered and differentiated value of the vehicle speed, or using a low-pass-filtered and differentiated tachometer signal.
- Deceleration ay of the vehicle means of an electronic stability program is advantageously calculated as shown, for example, in the article “FDR—die Fahrdynamikregelung von Bosch” (ESP—the Electronic Stability Program of Bosch), by A. van Zanten, R. Erhardt, and G. Pfaff, ATZ Automobiltechnische Zeitschrift (Automobile Technology Magazine) , 96 (1994) 11, pages 674 to 689.
- weighting value k is formed as a function of the driving situation. In an advantageous refinement, it assumes a value between 1.3 and 1.5 in response to sharp deceleration a fz of the vehicle, and a value between 1.0 and 1.2 in response to low deceleration a fz of the vehicle. If weighting value k is formed as a function of the driving situation, then weighting value k is advantageously formed in step 2 .
- reference speed v s is set equal to speed v R of the wheel, in a step 4 .
- differential speed v s is ascertained by interpolation.
- reference speed v s is interpolated in an advantageous refinement, according to the equation
- v s,neu is the interpolated value of the reference speed
- v s,alt is the previous (and possibly, already interpolated) value of the reference speed
- ⁇ is a constant, which is advantageously the weighting value K, and
- ⁇ t is the cycle time for the interpolation.
- step 6 which includes steps 1 and 2 , follows step 5 . That is, the same measures are implemented in step 6 as in step 1 and step 2 .
- step 6 is a decision block 7 , in which it is tested if
- step 4 comes next if the condition is satisfied, or essentially satisfied in an alternative embodiment.
- FIG. 2 indicates a speed-distance diagram, in which various speeds v are represented as a function of distance x.
- the speed-distance diagram in FIG. 2 shows the speed of a vehicle through a right-hand curve, where
- V RVL designates the (circumferential) speed of the left front wheel
- V RHL designates the (circumferential) speed of the left rear wheel
- V RVR designates the (circumferential) speed of the right front wheel
- V RHR designates the (circumferential) speed of the right rear wheel
- V SL designates the reference speed on the left side of the vehicle
- V SR designates the reference speed on the right side of the vehicle
- V WL designates the true speed on the left side of the vehicle
- V WR designates the true speed on the right side of the vehicle.
- FIG. 2 clarifies the procedure according to FIG. 1.
- reference speed v SR on the right side of the vehicle is ascertained by interpolation, in segment 21 .
- speed v RHR of the right rear wheel increases so sharply, that it is greater than the reference speed v SR on the right side of the vehicle, which was obtained by interpolation.
- the equation v SR v RHR is valid.
- speed v RHR has fallen so sharply again, that reference speed v SR of the right side of the vehicle is ascertained by interpolation.
- Reference speed v SL on the left side of the vehicle, reference speed v SR on the right side of the vehicle, true speed v WL on the left side of the vehicle, and true speed v WR on the right side of the vehicle are represented again in the speed-distance diagram in FIG. 3.
- FIG. 3 clearly shows that the reference speeds v SL and v SR only differ slightly from the true speeds v WL and v WR , even when the individual wheels of the vehicle are decelerating sharply.
- the difference of v SL and v SR which is ultimately a measure of the curve, is nearly identical to the difference of v WL and v WR .
- the method according to the present invention especially the discussed, advantageous refinement thereof, allows cornering to be detected in a particularly precise manner, even when the individual vehicle wheels are decelerating sharply.
- FIG. 4 displays means 14 for detecting a signal that indicates cornering.
- the one signal indicating vehicle cornering is transverse acceleration ay of the vehicle.
- Means 14 for detecting the one signal indicating vehicle cornering include two reference-speed calculators 10 and 11 , as well as a curve calculator 12 .
- Reference-speed calculator 10 ascertains reference speed v SL on the left side of the vehicle, as a function of vehicle deceleration a fz , speed v RVL of the left front wheel, and speed v RHL of the left rear wheel.
- Reference-speed calculator 11 ascertains reference speed v SR on the right side of the vehicle, as a function of vehicle deceleration a fz , speed v RVR of the right front wheel, and speed v RHR of the right rear wheel.
- the exemplary embodiment for calculating the reference speed according to FIG. 1 is implemented in each reference-speed calculator 10 , 11 .
- Curve calculator 12 calculates transverse acceleration a y of the vehicle according to
- v fz is the speed of the vehicle
- ⁇ is the yaw velocity of the vehicle.
- R A is the tread width
- F KORR is a correction factor.
- Correction factor F KORR is an empirical value which, e.g. compensates for possible tire slip.
- vehicular acceleration a fz , speed v RVL of the left front wheel, speed V RHL of the left rear wheel, speed v RVR of the right front wheel, and speed v RHR of the right rear wheel are provided by an electronic stability program 13 .
- An electronic stability program 13 Details of such an electronic stability program can be taken from the article “FDR—die Fahrdynamikregelung von Bosch” (ESP—the Electronic Stability Program of Bosch), by A. van Zanten, R. Erhardt, and G. Pfaff, ATZ Automobiltechnische Zeitschrift (Automobile Technology Magazine), 96 (1994) 11, pages 674 to 689.
- [0069] 14 means for detecting a signal that indicates cornering of a vehicle
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Abstract
A method and device for detecting cornering of a vehicle, or for ascertaining the transverse acceleration (ay) of a vehicle, where a signal indicating cornering of the vehicle, a measure of the curve radius, or the transverse acceleration (ay) of the vehicle is detected, using a reference speed (vS, vSL, vSR) for at least each side of the vehicle; and where a reference speed (vS, vSL, vSR) of one side of the vehicle is determined as a function of the deceleration of at least one wheel on this side of the vehicle.
Description
- The present invention relates to a method and a device for detecting cornering of a vehicle. Such a method, i.e. such a device detects a signal that indicates cornering. Such a signal that indicates cornering can be the curve radius, the transverse acceleration, or a signal containing comparable information. Methods for detecting cornering are described, for example, in EP 0 377 645 B1 and EP 0 376 984 B1. Under certain conditions, it has been shown that these methods do not indicate cornering with enough precision. This is especially true in vehicles equipped with an anti-lock braking system (ABS), a traction control system (TCS), or an electronic stability program (ESP). Further details regarding ABS, TCS, and ESP can be taken, e.g. from the article “FDR—die Fahrdynamikregelung von Bosch” (ESP—the Electronic Stability Program of Bosch), by A. van Zanten, R. Erhardt, and G. Pfaff, ATZ Automobiltechnische Zeitschrift (Automobile Technology Magazine), 96 (1994) 11, pages 674 to 689.
- For example, the known methods for detecting cornering can often not determine cornering precisely enough at wheels or axles, at which measures influencing operating dynamics are implemented, such as braking actions, ABS control actions, TCS control actions, or control actions from an electronic stability program. This is also apparent in the case of braking on a so-called split-friction road surface, i.e. roadways having a different coefficient of friction on the left and right sides of the vehicle. The known method cannot reliably differentiate such braking from braking while cornering.
- Correspondingly, the object of the present invention is to provide an improved method and device for detecting cornering of a vehicle.
- The object of the present invention is achieved by a method according to
claim 1, and by a device according toclaim 11. To detect cornering of a vehicle or to ascertain the transverse acceleration of a vehicle, a signal indicating vehicle cornering, a measure of the curve radius, or the transverse acceleration of the vehicle is determined in this case, using a reference speed for at least one side of the vehicle; a reference speed of a side of the vehicle being determined as a function of the deceleration of at least one wheel on this side of the vehicle. In this context, an example of a signal indicating cornering of the vehicle can be the curve radius, the transverse acceleration of the vehicle, or the difference of the reference speeds of the two sides of the vehicle. In this manner, cornering is clearly detected more precisely, and in particular, more reliably. - In an advantageous refinement of the present invention, the speed of the wheel is ascertained, e.g. measured, and the deceleration of the wheel is determined by differentiating the wheel speed with respect to time.
- In an advantageous further refinement of the present invention, the reference speed of the wheel is set equal to the speed of the wheel, when the deceleration of the wheel is less than or (essentially) equal to the deceleration of the vehicle, after the vehicle deceleration is increased by means of a weighting value.
- In another advantageous refinement of the present invention, the reference speed of the wheel is interpolated, when the deceleration of the wheel is greater than the deceleration of the vehicle, after the vehicle deceleration is increased by means of a weighting value.
- In an additional advantageous refinement of the present invention, the reference speed is interpolated according to the equation
- v s,neu =v s,alt −αa fz Δt
- where
- vs,neu is the interpolated value of the reference speed,
- vs,alt is the previous value of the reference speed,
- α is a constant, which is advantageously the weighting value,
- afz is the deceleration of the vehicle, and
- Δt is the cycle time for the interpolation.
- In a further advantageous refinement of the present invention, the deceleration of the vehicle is multiplied by the weighting value.
- In another advantageous refinement of the present invention, the weighting value is formed as a function of the driving situation.
- In another advantageous refinement of the present invention, the weighting value assumes a value between 1.3 and 1.5 in response to sharp deceleration of the vehicle, and a value between 1.0 and 1.2 in response to low deceleration of the vehicle.
- In an advantageous further refinement of the present invention, the reference speed of the wheel is set equal to the speed of the wheel, when the speed of the wheel is greater than or essentially equal to the wheel reference speed obtained by interpolation.
- In another advantageous refinement of the present invention, the speed of at least two vehicle wheels is ascertained, e.g. measured, and the reference speed of each side of the vehicle is ascertained, the reference speed of a wheel being determined as a function of the deceleration of the fastest wheel of the side.
- Further advantages and details result from the subsequent description of the exemplary embodiments. The individual figures show:
- FIG. 1 an exemplary embodiment for calculating the reference speed;
- FIG. 2 a speed-distance diagram;
- FIG. 3 a speed-distance diagram; and
- FIG. 4 means for detecting a signal indicating cornering.
- FIG. 1 shows an exemplary embodiment for calculating reference speed vS for a side of a vehicle. In a
first step 1, the current speed of the wheel or wheels on one side of a vehicle is read in. If the speed of only one wheel is read in, then this speed is designated by VR. However, an advantageous further refinement provides for reading in the speeds of all or both wheels on a side of a vehicle. In this case, it is also determined instep 1, which of these wheels on one side has the highest speed. The highest speed is then value vR. Therefore, this highest speed is likewise designated as the wheel speed in the subsequent explanation of FIG. 1. - Deceleration aR of the wheel is determined in a
next step 2. To that end, vR is differentiated. In this case, it is advantageous that the differentiation is not performed by a pure derivative-action element, but rather by a DT1 element or a DT2 element. - In
step 1, vehicle deceleration afz is also read in. The value for the vehicle deceleration can be obtained, e.g. using a low-pass-filtered and differentiated value of the vehicle speed, or using a low-pass-filtered and differentiated tachometer signal. Deceleration ay of the vehicle means of an electronic stability program is advantageously calculated as shown, for example, in the article “FDR—die Fahrdynamikregelung von Bosch” (ESP—the Electronic Stability Program of Bosch), by A. van Zanten, R. Erhardt, and G. Pfaff, ATZ Automobiltechnische Zeitschrift (Automobile Technology Magazine) , 96 (1994) 11, pages 674 to 689. - If, e.g. an electronic stability program ESP is implemented in the vehicle, as is described in this article, then the values of wheel speeds vR and the value of vehicle deceleration afz are provided by the electronic stability program, in an advantageous further refinement.
- Using
decision block 3, it is tested if - |αR|>k|αfz|
- where k is a weighting value. In an advantageous refinement, weighting value k is formed as a function of the driving situation. In an advantageous refinement, it assumes a value between 1.3 and 1.5 in response to sharp deceleration afz of the vehicle, and a value between 1.0 and 1.2 in response to low deceleration afz of the vehicle. If weighting value k is formed as a function of the driving situation, then weighting value k is advantageously formed in
step 2. - If the condition
- |αR|>k|αfz|
- is not satisfied, or essentially not satisfied in an alternative embodiment, then reference speed vs is set equal to speed vR of the wheel, in a step 4.
- On the other hand, if the condition
- |αR|>k|αfz|
- is satisfied, or essentially satisfied in an alternative embodiment, then differential speed vs is ascertained by interpolation. In this case, reference speed vs is interpolated in an advantageous refinement, according to the equation
- v s,neu =v alt−αafz Δt
- where
- vs,neu is the interpolated value of the reference speed,
- vs,alt is the previous (and possibly, already interpolated) value of the reference speed,
- α is a constant, which is advantageously the weighting value K, and
- Δt is the cycle time for the interpolation.
- After interpolating, the value of reference speed vs is equal to Vs,neu. A
step 6, which includessteps step 5. That is, the same measures are implemented instep 6 as instep 1 andstep 2. - Following
step 6 is adecision block 7, in which it is tested if - vR≧vS
- If this condition is not satisfied, or essentially not satisfied in an alternative embodiment, then steps5 and 6 are repeated. On the other hand, step 4 comes next if the condition is satisfied, or essentially satisfied in an alternative embodiment.
- FIG. 2 indicates a speed-distance diagram, in which various speeds v are represented as a function of distance x. The speed-distance diagram in FIG. 2 shows the speed of a vehicle through a right-hand curve, where
- VRVL designates the (circumferential) speed of the left front wheel,
- VRHL designates the (circumferential) speed of the left rear wheel,
- VRVR designates the (circumferential) speed of the right front wheel,
- VRHR designates the (circumferential) speed of the right rear wheel,
- VSL designates the reference speed on the left side of the vehicle,
- VSR designates the reference speed on the right side of the vehicle,
- VWL designates the true speed on the left side of the vehicle, and
- VWR designates the true speed on the right side of the vehicle.
- FIG. 2 clarifies the procedure according to FIG. 1. In
segment 20, for example, reference speed vSR on the right side of the vehicle is thus based on speed vRVR of the right front wheel, i.e. vSR=vRVR. However, reference speed vSR on the right side of the vehicle is ascertained by interpolation, insegment 21. Insegment 22, speed vRHR of the right rear wheel increases so sharply, that it is greater than the reference speed vSR on the right side of the vehicle, which was obtained by interpolation. Accordingly, the equation vSR=vRHR is valid. Insegment 23, speed vRHR has fallen so sharply again, that reference speed vSR of the right side of the vehicle is ascertained by interpolation. - Reference speed vSL on the left side of the vehicle, reference speed vSR on the right side of the vehicle, true speed vWL on the left side of the vehicle, and true speed vWR on the right side of the vehicle are represented again in the speed-distance diagram in FIG. 3. FIG. 3 clearly shows that the reference speeds vSL and vSR only differ slightly from the true speeds vWL and vWR, even when the individual wheels of the vehicle are decelerating sharply. In particular, the difference of vSL and vSR, which is ultimately a measure of the curve, is nearly identical to the difference of vWL and vWR. This clearly shows that the method according to the present invention, especially the discussed, advantageous refinement thereof, allows cornering to be detected in a particularly precise manner, even when the individual vehicle wheels are decelerating sharply.
- FIG. 4 displays means14 for detecting a signal that indicates cornering. In the exemplary embodiment displayed here in FIG. 4, the one signal indicating vehicle cornering is transverse acceleration ay of the vehicle. Means 14 for detecting the one signal indicating vehicle cornering include two reference-
speed calculators curve calculator 12. Reference-speed calculator 10 ascertains reference speed vSL on the left side of the vehicle, as a function of vehicle deceleration afz, speed vRVL of the left front wheel, and speed vRHL of the left rear wheel. Reference-speed calculator 11 ascertains reference speed vSR on the right side of the vehicle, as a function of vehicle deceleration afz, speed vRVR of the right front wheel, and speed vRHR of the right rear wheel. In addition, the exemplary embodiment for calculating the reference speed according to FIG. 1 is implemented in each reference-speed calculator Curve calculator 12 calculates transverse acceleration ay of the vehicle according to -
-
- where RA is the tread width, and FKORR is a correction factor. Correction factor FKORR is an empirical value which, e.g. compensates for possible tire slip.
- In the exemplary embodiment shown in FIG. 4, vehicular acceleration afz, speed vRVL of the left front wheel, speed VRHL of the left rear wheel, speed vRVR of the right front wheel, and speed vRHR of the right rear wheel are provided by an
electronic stability program 13. Details of such an electronic stability program can be taken from the article “FDR—die Fahrdynamikregelung von Bosch” (ESP—the Electronic Stability Program of Bosch), by A. van Zanten, R. Erhardt, and G. Pfaff, ATZ Automobiltechnische Zeitschrift (Automobile Technology Magazine), 96 (1994) 11, pages 674 to 689. -
-
-
- |αR|>k|αfz
-
-
-
-
-
-
-
-
- afz deceleration of the vehicle
- aR deceleration of a wheel
- ay transverse acceleration of the vehicle
- k weighting value
- t time
- v speed
- vfz speed of the vehicle
- vR (circumferential) speed of a wheel
- vRVL (circumferential) speed of the left front wheel
- vRHL (circumferential) speed of the left rear wheel
- vRVR (circumferential) speed of the right front wheel
- vRHR (circumferential) speed of the right rear wheel
- vS reference speed
- vSL reference speed on the left side of the vehicle
- vSR reference speed on the right side of the vehicle
- vs,neu the interpolated value of the reference speed
- vs,alt the previous value of the reference speed
- vWL true speed on the left side of the vehicle
- vWR true speed on the right side of the vehicle
- RA tread width of the vehicle
- FKORR correction factor
- α constant, which is advantageously the weighting value
- Δt cycle time for the interpolation
- ω yaw velocity of the vehicle
Claims (11)
1. A method for detecting cornering of a vehicle, or for ascertaining the transverse acceleration (ay) of a vehicle, characterized in that a signal indicating cornering of the vehicle, a measure of the curve radius, or the transverse acceleration (ay) of the vehicle is detected for at least each side of the vehicle, using a reference speed (vS, vSL, vSR); a reference speed (vS, vSL, vSR) of a side of the vehicle being determined as a function of the deceleration of at least one wheel on this side of the vehicle.
2. The method as recited in , characterized in that the speed (vR, vRVL, vRVR, vRHL, vRHR) of the wheel is ascertained, and the deceleration of the wheel is determined by differentiating the speed (vR, vRVL, vRVR, vRHL, vRHR) of the wheel with respect to time.
claim 1
3. The method as recited in or , characterized in that the reference speed (vR, vSL, vSR) of the wheel is set equal to the speed (vR, vRVL, vRVR, vRHL, vRHR) of the wheel, when the deceleration of the wheel is less than or equal to the deceleration of the vehicle (afz), after the vehicle deceleration has been increased by means of a weighting value (k).
claim 1
2
4. The method as recited in , , or 3, characterized in that the reference speed (vS, vSL, vSR) of the wheel is interpolated, when the deceleration of the wheel is greater than the deceleration (afz) of the vehicle, after the vehicle deceleration has been increased by means of the weighting value (k).
claim 1
2
5. The method as recited in , characterized in that the reference speed (vS, vSL, vSR) is interpolated according to
claim 4
v s,neu =v s,alt−αafz Δt
where
vs,neu is the interpolated value of the reference speed,
vs,alt is the previous value of the reference speed,
α is a constant, which is advantageously the weighting value,
afz is the deceleration of the vehicle, and
Δt is the cycle time for the interpolation.
6. The method as recited in , , or 5, characterized in that the deceleration (afz) of the vehicle is multiplied by the weighting value (k).
claim 3
4
7. The method as recited in , , 5, or 6, characterized in that the weighting value (k) is formed as a function of the driving situation.
claim 3
4
8. The method as recited in , , 5, 6, or 7, characterized in that the weighting value (k) assumes a value between 1.3 and 1.5 in response to sharp vehicle deceleration (afz), and a value between 1.0 and 1.2 in response to low vehicle deceleration (afz).
claim 3
4
9. The method as recited in one of the claims 4 through 8, characterized in that the reference speed (vS, vSL, vSR) of the wheel is set equal to the speed (vR, vRVL, vRVR, vRHL, vRHR) of the wheel, when the speed (vR, vRVL, vRVR, vRHL, vRHR) of the wheel is greater than or essentially equal to the wheel reference speed (vS, vSL, vSR) obtained by interpolation.
10. The method as recited in one of the preceding claims, characterized in that the speed of at least two vehicle wheels is ascertained, and the reference speed (vS, vSL, vSR) of each side of the vehicle is ascertained, the reference speed (vS, vSL, vSR) of a wheel being determined as a function of the deceleration of the fastest wheel on the side.
11. A device for detecting cornering of a vehicle, or for ascertaining the transverse acceleration (ay) of a vehicle, according to a method as recited in one of the preceding claims, characterized in that the device has a curve calculator (12) for detecting a signal indicating vehicle cornering, for ascertaining a measure of the curve radius, or for determining the transverse acceleration (ay) of the vehicle, as a function of a reference speed (vS, vSL, vSR) of at least each side of the vehicle; and in that the device has at least two reference-speed calculators (10, 11) for determining a reference speed (vS, vSLvSR) of at least one side of the vehicle, as a function of the deceleration of at least one wheel on this side of the vehicle.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19962328.7 | 1999-12-23 | ||
DE19962328A DE19962328A1 (en) | 1999-12-23 | 1999-12-23 | Method for precisely indicating the curved path of a vehicle or determining the transverse acceleration of a vehicle for use in ABS, anti-slip or vehicle dynamics systems by measurement of wheel velocities |
DE19962328 | 1999-12-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010020209A1 true US20010020209A1 (en) | 2001-09-06 |
US6445994B2 US6445994B2 (en) | 2002-09-03 |
Family
ID=7934027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/747,256 Expired - Lifetime US6445994B2 (en) | 1999-12-23 | 2000-12-22 | Method and device for detecting cornering of a vehicle |
Country Status (5)
Country | Link |
---|---|
US (1) | US6445994B2 (en) |
JP (1) | JP4953503B2 (en) |
KR (1) | KR100681960B1 (en) |
DE (1) | DE19962328A1 (en) |
FR (1) | FR2803039B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8930097B2 (en) | 2008-07-09 | 2015-01-06 | Renault S.A.S. | Device for evaluating the transverse acceleration of an automobile vehicle and corresponding method |
CN110418940A (en) * | 2017-01-13 | 2019-11-05 | 卡罗瑟里赫斯股份公司 | Method for predicting the future driving conditions of vehicle |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2966689B1 (en) | 2010-10-21 | 2016-01-08 | Fagorbrandt Sas | METHOD FOR DETECTING CONTAINERS DISPOSED ON A COOKTOP AND COOKTOP. |
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DE3731077A1 (en) | 1987-09-16 | 1989-03-30 | Bosch Gmbh Robert | METHOD FOR DETECTING CURVS AND CROSS-ACCELERATING DETERMINATION IN A VEHICLE |
DE3739558A1 (en) * | 1987-11-21 | 1989-06-01 | Bosch Gmbh Robert | METHOD FOR GENERATING A SIGNAL SIGNALING |
JPH01244373A (en) * | 1988-03-25 | 1989-09-28 | Fujitsu Ten Ltd | Apparatus for detecting acceleration of vehicle and speed of vehicle |
DE3924507A1 (en) * | 1989-02-18 | 1990-08-23 | Bosch Gmbh Robert | METHOD FOR RELEASING RETENTION AGENTS |
JPH04237648A (en) * | 1991-01-18 | 1992-08-26 | Toyota Autom Loom Works Ltd | Vehicle travel state display device |
US5802491A (en) * | 1992-09-10 | 1998-09-01 | Robert Bosch Gmbh | Motor vehicle control system and method |
DE4230295B4 (en) * | 1992-09-10 | 2004-11-25 | Robert Bosch Gmbh | Control system for a motor vehicle |
JP3453848B2 (en) * | 1994-06-13 | 2003-10-06 | 株式会社デンソー | Vehicle anti-skid control device |
JP2749784B2 (en) * | 1994-11-21 | 1998-05-13 | 住友電気工業株式会社 | Turning radius calculation method and turning radius calculation device |
DE19602994A1 (en) * | 1996-01-27 | 1997-07-31 | Teves Gmbh Alfred | Method for determining variables that describe the driving behavior of a vehicle |
AU2083897A (en) * | 1996-02-03 | 1997-08-22 | Itt Manufacturing Enterprises, Inc. | Method of determining variables which describe a vehicle's driving characteristics |
JP3724072B2 (en) * | 1996-08-12 | 2005-12-07 | 株式会社デンソー | Brake device for vehicle |
JPH10175529A (en) * | 1996-12-20 | 1998-06-30 | Aisin Seiki Co Ltd | Vehicle turn state quantity estimating device |
DE19735562B4 (en) * | 1997-08-16 | 2010-01-07 | Continental Teves Ag & Co. Ohg | Method and device for determining the reference speed in a motor vehicle |
JPH11147460A (en) * | 1997-11-17 | 1999-06-02 | Toyota Motor Corp | Estimation system for coefficient of friction on road for vehicle |
-
1999
- 1999-12-23 DE DE19962328A patent/DE19962328A1/en not_active Ceased
-
2000
- 2000-12-04 JP JP2000368609A patent/JP4953503B2/en not_active Expired - Fee Related
- 2000-12-14 FR FR0016457A patent/FR2803039B1/en not_active Expired - Fee Related
- 2000-12-22 KR KR1020000080007A patent/KR100681960B1/en not_active IP Right Cessation
- 2000-12-22 US US09/747,256 patent/US6445994B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8930097B2 (en) | 2008-07-09 | 2015-01-06 | Renault S.A.S. | Device for evaluating the transverse acceleration of an automobile vehicle and corresponding method |
CN110418940A (en) * | 2017-01-13 | 2019-11-05 | 卡罗瑟里赫斯股份公司 | Method for predicting the future driving conditions of vehicle |
US11287268B2 (en) * | 2017-01-13 | 2022-03-29 | Carrosserie Hess Ag | Method for predicting future driving conditions for a vehicle |
US20220178704A1 (en) * | 2017-01-13 | 2022-06-09 | Carrosserie Hess Ag | Method for predicting future driving conditions for a vehicle |
Also Published As
Publication number | Publication date |
---|---|
JP4953503B2 (en) | 2012-06-13 |
FR2803039B1 (en) | 2008-06-13 |
US6445994B2 (en) | 2002-09-03 |
KR100681960B1 (en) | 2007-02-15 |
KR20010070329A (en) | 2001-07-25 |
JP2001201512A (en) | 2001-07-27 |
FR2803039A1 (en) | 2001-06-29 |
DE19962328A1 (en) | 2001-06-28 |
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