Claims
- 1. A system for projecting a data which is representative of a vehicular speed for performing slip control of an automotive vehicle, comprising:
- a wheel speed sensor monitoring wheel speed to produce a wheel speed indicative signal;
- a vehicle acceleration sensor for monitoring an acceleration exerted on a vehicular body to produce a vehicular acceleration indicative signal;
- first means respondive to the vehicular acceleration indicative signal from said vehicle acceleration sensor to integrate it over time to provide an integrated value, said first means also being responsive to the wheel speed indicative signal from said wheel speed sensor to project a vehicular speed representative data based on the integrated value and an initial value which is provided by the wheel speed indicative signal as a value defining an initial speed magnitude of the projected vehicular speed representative data;
- second means responsive to the wheel speed indicative signal having a value greater than that of the projected vehicular speed representative data to provide a signal indicative thereof;
- third means responsive to the signal from said second means to provide an instantaneous wheel speed indicative signal from said wheel speed sensor to said first means as the initial value for projecting the vehicular speed representative data; and
- fourth means for deriving wheel slippage data on the basis of said projected vehicular speed representative data and a value of the wheel speed indicative signal.
- 2. A system as set forth in claim 1, wherein said second means is responsive to said wheel speed indicative signal value increasing across the value of the projected vehicular speed representative data to provide said signal to said third means.
- 3. A system as set forth in claim 2, wherein said second means includes a pulse generating means for producing a periodic signal for resetting said first means to update the initial value with a value of the instantaneos wheel speed indicative signal.
- 4. A system as set forth in claim 3, wherein said second means is responsive to said increasing of said wheel speed indicative signal value across the value of the projected vehicular speed representative data, to provide said signal to said third means in response to the periodic signal.
- 5. A system as set forth in claim 1, wherein said first means offsets a value of the vehicular acceleration indicative signal by a preselected negative value to provide and offset vehicular acceleration indicative signal, and integrates the offset vehicular acceleration indicative signal over time to provide the integrated value.
- 6. A system as set forth in claim 2, wherein said third means includes means for providing a periodic signal for resetting said first means to change the initial value to a value of the instantaneous wheel speed indicative signal when the value of the wheel speed indicative signal is greater than that of the projected vehicle speed representative data.
- 7. An anti-skid control system for an automotive brake system, comprising:
- a hydraulic circuit for building up braking pressure in response to depression of an automotive brake, said circuit being operable to increase braking pressure in a first mode position and to decrease braking pressure in a second mode position;
- a wheel speed sensor for monitoring a rotation speed of a vehicular wheel to produce a wheel speed indicative signal;
- a vehicle acceleration sensor for monitoring acceleration exerted on a vehicular body to produce a vehicular acceleration indicative signal;
- first means responsive to the vehicular acceleration indicative signal from said vehicle acceleration sensor to integrate it over time to provide an integrated value, said first means also being responsive to the wheel speed indicative signal from said wheel speed sensor to project vehicular speed representative data based on the integrated value and an initial value which is provided by the wheel speed indicative signal as a value defining an initial speed magnitude of the projected vehicular speed representative data;
- second means responsive to the wheel speed indicative signal having a value greater than that of the projected vehicular speed representative data to provide a signal indicative thereof;
- third means responsive to the signal from said second means to provide an instantaneous wheel speed indicative signal from said wheel speed sensor to said first means as the initial value for projecting the vehicular speed representative data;
- fourth means for deriving wheel slippage data on the basis of said projected vehicular speed representative data and a value of the wheel speed indicative signal; and
- fifth means for deriving a control signal for selectively operating said hydraulic circuit in said first mode position and said second mode position on the basis of said wheel speed indicative signal, said wheel acceleration indicative signal, said projected vehicular speed indicative data and said wheel slippage data so as to maintain wheel slippage at a predetermined optimal value.
- 8. An anti-skid control system as set forth in claim 7, wherein said second means is responsive to said wheel speed indicative signal value increasing across the value of the projected vehicular speed representative data to provide said signal to said third means.
- 9. An anti-skid control system as set forth in claim 8, wherein said second means includes a pulse generating means for producing a periodic signal for resetting said first means to update the initial value with a value of the instantaneous wheel speed indicative signal
- 10. An anti-skid control system as set forth in claim 9, wherein said second means is responsive to said increasing of said wheel speed indicative signal value across the value of the projected vehicular speed representative data to provide said signal to said third means in response to the periodic signal.
- 11. A system as set forth in claim 7, wherein said first means offsets a value of the vehicular acceleration indicative signal by a preselected negative value to provide an offset vehicular acceleration indicative signal and integrates the offset vehicular acceleration indicative signal over time to provide the integrated value.
- 12. A system for projecting data indicative of a vehicle speed for carrying out anti-skid control of an automotive vehicle comprising:
- a wheel speed sensor detecting wheel speed to provide a signal indicative thereof;
- a vehicle acceleration sensor detecting acceleration acting on a vehicle body to provide a signal indicative thereof;
- first means responsive to the signal from said vehicle acceleration sensor for offsetting a value of the acceleration by a preselected negative value to provide a signal indicative of an offset acceleration value;
- second means responsive to the signal from said first means to integrate the offset acceleration value over time to provide an integrated value which defines a variation in vehicle speed, said first means also being responsive to the signal from said wheel speed sensor to project a vehicle speed representative data based on the integrated value and an initial value provided by the wheel speed which defines an initial speed magnitude of the projected vehicular speed representative data;
- third means response to the signal from said wheel speed sensor which has a value greater than that of the projected vehicle speed representative data to provide a signal indicative thereof;
- fourth means responsive to the signal from said third means to provide an instantaneous wheel speed detected by said wheel speed sensor to said second means as the initial value for projecting the vehicular speed representative data; and
- fifth means for deriving wheel slippage data on the basis of said projected vehicular speed representative data and the wheel speed signal detected by said wheel speed sensor.
- 13. A system as set forth in claim 12, wherein said third means is responsive to the wheel speed signal increasing across the value of the projected vehicular speed representative data to provide said signal to said fourth means.
- 14. A system for projecting data indicative of a vehicular speed to determine wheel slippage for performing slip control of an automotive vehicle comprising:
- vehicle acceleration detecting means for detecting acceleration of a vehicle body for determining an acceleration value;
- offset means for offsetting the acceleration value determined by said vehicle acceleration detecting means by a preselected constant magnitude;
- vehicle speed projecting means for integrating said acceleration value offset by said offset means to project a vehicle speed;
- wheel rotational speed detecting means for detecting rotational speed of wheel;
- vehicle speed selecting means for selecting the greater of a value of the projected vehicle speed and a speed value determined by the rotational speed of the wheel as the vehicle speed;
- integrating initial value setting means for setting the speed value determined by a rotational speed of the wheel as an initial value in the integrating operation of said vehicle speed projecting means periodically when the speed value determined by the rotational speed of the wheel is selected by said vehicle speed selecting means as the vehicle speed; and
- slippage calculating means for determining an amount of slippage of the wheel based on the selected vehicle speed and the detected rotational speed of the wheel.
- 15. An anti-skid control system for an automotive brake system comprising:
- vehicle acceleration detecting menas for detecting acceleration of a vehicle body for determining an acceleration value;
- offset means for offsetting the acceleration value determined by said vehicle acceleration detecting means by a preselected constant magnitude;
- vehicle speed projecting means for integrating said acceleration value offset by said offset means to project a vehicle speed;
- wheel rotational speed detecting means for detecting rotational speed of a wheel;
- vehicle speed selecting means for selecting the greater of a value of the projected vehicle speed and a speed value determined by the rotational speed of the wheel as a vehicle speed;
- integrating initial value setting means for setting the speed value determined by the rotational speed of the wheel as an initial value in the integrating operation of said vehicle speed projecting means periodically when the speed value determined by the rotational speed of the wheel is selected by said vehicle speed selecting means as the vehicle speed;
- slippage calculating means for determining an amount of slippage of the wheel based on the selected vehicle speed and the detected rotational speed of the wheel; and
- brake hydraulic pressure control means for controlling an actuator for selectively increasing and decreasing pressure of a brake working fluid according to the amount of slippage determined by said slippage calculating means.
Priority Claims (1)
Number |
Date |
Country |
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62-257021 |
Oct 1987 |
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Parent Case Info
This application is a continuation of application Ser. No. 07/256,632, filed Oct. 12, 1988 now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
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256632 |
Oct 1988 |
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