Retarder brake automatic control system
First Claim
1. A retarder brake automatic control system for causing a vehicle, having an automatic transmission controller for automatically shifting transmission stages corresponding to the speed of the vehicle, to run downhill at a set speed by driving a retarder brake based on a set speed command which is set by speed setting means when the vehicle runs downhill using an engine brake, said system comprising:
- fault detecting means for detecting abnormality in at least one predetermined engine parameter during downhill operation of the vehicle, andtemporary set speed command generating means for generating a temporary set speed command corresponding to a transmission stage which is one stage lower than the transmission stage of said automatic transmission controller corresponding to the set speed command, causing said retarder brake to be driven based on the temporary set speed command in place of the set speed command at the time of fault detection when an abnormality is detected by said fault detecting means.
1 Assignment
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Accused Products
Abstract
A retarder brake automatic control system capable of causing a vehicle to run downhill at a speed set by a speed setter, in which a vehicle speed is automatically controlled by means of a microcomputer. The microcomputer includes a fault detector which detects abnormality in factors for safety running of the vehicle, and controls a retarder brake so as to cause the vehicle to run at an appropriate speed in accordance with the output of the fault detector.
37 Citations
11 Claims
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1. A retarder brake automatic control system for causing a vehicle, having an automatic transmission controller for automatically shifting transmission stages corresponding to the speed of the vehicle, to run downhill at a set speed by driving a retarder brake based on a set speed command which is set by speed setting means when the vehicle runs downhill using an engine brake, said system comprising:
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fault detecting means for detecting abnormality in at least one predetermined engine parameter during downhill operation of the vehicle, and temporary set speed command generating means for generating a temporary set speed command corresponding to a transmission stage which is one stage lower than the transmission stage of said automatic transmission controller corresponding to the set speed command, causing said retarder brake to be driven based on the temporary set speed command in place of the set speed command at the time of fault detection when an abnormality is detected by said fault detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A retarder brake automatic control system for detecting abnormality of the temperature of a brake cooling medium and controlling downhill speed of a vehicle based thereon, comprising:
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a first temperature sensor for continuously measuring the temperature of the brake cooling medium, a second temperature sensor having a first state in response to a normal range of said temperature, and a second state in response to an abnormal range of said temperature, judging means for determining the existance of a fault based on the outputs of said first and second temperature sensors, and means for stopping said vehicle when a fault is found by said judging means. - View Dependent Claims (9)
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10. A retarder brake automatic control system for detecting fault of a speed sensor and controlling the downhill speed of a vehicle based thereon, comprising:
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memory means for storing upper and lower limit values of a vehicle speed for each transmission stage, means for reading out the upper and the lower limit values corresponding to transmission stages by transmission speed signals outputted from an automatic transmission controller, and a comparing means for issuing a fault signal when a speed value corresponding to the output of the speed sensor becomes out of the range from the upper limit value to the lower limit value of the vehicle speed which has been read out.
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11. A retarder brake automatic control system for causing a vehicle, having an automatic transmission controller for automatically shifting transmission stages corresponding to the speed of the vehicle, to run downhill at a set speed by driving a retarder brake based on a set speed command which is set by speed setting means when the vehicle runs downhill using an engine brake comprising:
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temperature range detecting means for detecting into which range between a safety range, a warning range, and an alarm range, the temperature corresponding to the temperature of a brake cooling medium is classified, temporary set speed command generating means for generating a temporary set speed command corresponding to a transmission stage which is one stage lower than the transmission stage of said automatic transmission controller corresponding to the set speed command, causing said retarder brake to be driven based on the temporary set speed command in place of set speed command at the time when said temperature is classified into a warning range, and slow down stop control means for generating a signal for gradually increasing breaking force in place of the set speed command when said temperature is classified into said alarm range.
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Specification