Control device for vehicle including anti-skid braking system and power steering control system
First Claim
1. A control device for a vehicle including an anti-skid braking system and power steering control system including an electric motor for proving an assisting steering torque for a steering wheel of said vehicle, said control device comprising:
- torque sensor means for determining a torque of said steering wheel;
road wheel velocity sensor means for detecting velocities of road wheels of said vehicle;
brake sensor means for detecting an operation of a brake of said vehicle;
first control means, coupled to said torque sensor means, for determining a driving direction and a driving torque of said electric motor on the basis of an output of said torque sensor means, said first control means generating a first direction signal and a torque signal for said electric motor on the basis of said driving direction and said driving torque of said electric motor determined by said first control means;
second control means, coupled to said torque sensor means, said road wheel velocity sensor means and said brake sensor means, for generating a brake operation signal for said anti-skid braking system on the basis of outputs of said road wheel velocity sensor means and said brake sensor means, wherein said second control means determines a driving direction of said electric motor on the basis of said output of said torque sensor means and outputs a second direction signal for said electric motor on the basis of said direction of said electric motor determined by said second control means;
logical circuit means, coupled to said first and second control means, for generating a direction command signal, coinciding with said first and second direction signals, only when said first and second direction signals output from said first and second control means, respectively, coincide; and
motor drive circuit means coupled to said first control means and said logical circuit means, said motor drive circuit means driving said electric motor in accordance with said torque signal and said direction command signal.
1 Assignment
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Accused Products
Abstract
A unified control device for a vehicle including an anti-skid braking system and power steering control system is controlled by two microcomputers (4B and 24B). On the basis of the outputs of the torque sensors (1a and 1b, etc.), the first microcomputer (4B) determines the driving direction and torque of the DC motor (9) providing the assisting steering torque for the steering wheel, and outputs the torque signal (T) and the first direction signal (D1) for the DC motor (9). The second microcomputer (24B) generates the brake operation signal (B) on the basis of the outputs of the road wheel velocity sensors (21a through 21d) and the brake switch (22). Further, on the basis of the output of the torque sensors (1a and 1b), the microcomputer (24B) determines the direction of the DC motor (9), and outputs the second direction signal (D2). The motor drive circuit (8) drives the DC motor (9) in accordance with the torque signal (T) and the direction command signal (D), which is output from the AND circuit (40) only when the first and second direction signals (D1 and D2) coincide. Further, the microcomputers (4B and 24B) output first and second fail-safe relay energization signals (F1 and F2), respectively, when the power steering control system and the anti-skid braking system are judged to be operating normally. The power supply control circuit (42) immediately opens the fail-safe relay unit (6B) when neither the first and second signals (F1 and F2) are supplied. However, in the case where only one of the first and second signals (F1 and F2) are supplied, the power supply control circuit (42) defers the interruption of the fail-safe relay unit (6B) until the vehicle stops.
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Citations
5 Claims
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1. A control device for a vehicle including an anti-skid braking system and power steering control system including an electric motor for proving an assisting steering torque for a steering wheel of said vehicle, said control device comprising:
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torque sensor means for determining a torque of said steering wheel; road wheel velocity sensor means for detecting velocities of road wheels of said vehicle; brake sensor means for detecting an operation of a brake of said vehicle; first control means, coupled to said torque sensor means, for determining a driving direction and a driving torque of said electric motor on the basis of an output of said torque sensor means, said first control means generating a first direction signal and a torque signal for said electric motor on the basis of said driving direction and said driving torque of said electric motor determined by said first control means; second control means, coupled to said torque sensor means, said road wheel velocity sensor means and said brake sensor means, for generating a brake operation signal for said anti-skid braking system on the basis of outputs of said road wheel velocity sensor means and said brake sensor means, wherein said second control means determines a driving direction of said electric motor on the basis of said output of said torque sensor means and outputs a second direction signal for said electric motor on the basis of said direction of said electric motor determined by said second control means; logical circuit means, coupled to said first and second control means, for generating a direction command signal, coinciding with said first and second direction signals, only when said first and second direction signals output from said first and second control means, respectively, coincide; and motor drive circuit means coupled to said first control means and said logical circuit means, said motor drive circuit means driving said electric motor in accordance with said torque signal and said direction command signal. - View Dependent Claims (2, 3, 4, 5)
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Specification