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EP0051004A2
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Automatic speed control system for a heavy vehicle
Assignee: Honeywell International Inc
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Filing: 1981-10-02
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Granted: —
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Expires: 2001-10-02
Abstract
Abstract An automatic speed control for a heavy vehicle including a system control unit (10) which regulates communication between a compressed air source (18) and an air actuated throttle (19); the system control unit (10) generates control signals over lines (15,17) which are a function of a speed error signal and the position of the air actuated throttle (19) to regulate the compressed air source (18); the speed error signal is calculated as the difference between a commanded speed signal input from a pair of set and resume switches (34,36) and an actual speed signal (AVS); to generate the control signals, the speed error signal and throttle position signal (THL) are operated on inthe system control unit (10) by different lead-lag transfer functions, and these lead-lag terms are thereafter combined with a proportional speed error term to yield the desired control signals; according to the invention the system control unit (10) includes a cruise control means for controlling the vehicle speed to a commanded speed when the vehicle is moving, a throttle control means for controlling the engine speed when the vehicle is stationary and a mode control means for switching control of the system between the cruise control means and the throttle control means.
Inventors
- 👤 Patrick John O'keefe
- 👤 Frank Richmond Schubert
- 👤 Guy Thomas Rini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 17:00
CPC Classifications
B; B60; B60K; B60K26/00; B60K26/04; B60K31/00; B60K31/06; B60K31/10; B60K31/102; B60K31/105; F; F02; F02D; F02D11/00; F02D11/06; F02D11/10; F02D11/105; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D2041/141
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
Automatic speed control system for a heavy vehicle including a cruise control means (100) for controlling the speed of the vehicle to a commanded speed when the vehicle is moving, characterized in that said system comprises: a throttle control means (102) for controlling the speed of the engine of said vehicle when the vehicle is stationary; and a mode control means (104,106,178,300) for switching control of the system between said cruise control means (100) and said throttle control means (102).
Claim 2
Dependent Claim
80 words
Automatic speed control system for a heavy vehicle including a cruise control means (100) for controlling the speed of the vehicle to a commanded speed when the vehicle is moving, characterized in that said system comprises: a throttle control means (102) for controlling the speed of the engine of said vehicle when the vehicle is stationary; and a mode control means (104,106,178,300) for switching control of the system between said cruise control means (100) and said throttle control means (102).
Claim 3
Dependent Claim
114 words
Automatic speed control system as claimed in Claim 1, characterized in that said cruise control means (100) comprises: means (32,56) for generating an actual speed signal (AVS) proportional to the actual speed of the vehicle; means (150) for generating a commanded speed signal (CSS) proportional to the desired speed of the vehicle; means (152) for generating a speed error signal (VES) proportional to the difference between said actual speed signal (AVS) and said commanded speed signals (CSS); and means (154,160) for generating a cruise control signal (CCS) as a function of said speed error signal (VES), which control signal (CCS) regulates the actual speed of the vehicle to reduce said speed error signal (VES).
Claim 4
Dependent Claim
120 words
Automatic speed control system as claimed in Claim 1, characterized in that said throttle control means (102) comprises: means (310,312,334,342) for generating a commanded throttle position signal (CTP) proportional to the desired speed of the engine; means (12) for generating an actual throttle position signal (THL) proportional to the actual throttle position of the engine; means (344,345, 346) for generating a throttle position error signal proportional to the difference between said actual and commanded throttle position signals (THL,CTP); and means (350) for generating a throttle control signal (TCS) as a function of said throttle position error signal, which throttle control signal (TCS) regulates the position of the throttle (19) of the vehicle engine to reduce said throttle position error signal.
Claim 5
Dependent Claim
120 words
Automatic speed control system as claimed in Claim 1, characterized in that said cruise control means (100) generates a cruise control signal (CCS), and said throttle control means (102) generates a throttle - control signal (TCS); and in that said system further comprises a duty cycle translator (110) responsive to said control signals (TCS,CCS) for cyclically actuating a pair of electrically actuated valves (20,22;24,26) for varying the percentages of the time of each cycle in dependence upon the value of said control signals (TCS,CCS), said mode control means (104,106,178,300) switching the input of said duty cycle translator (110) between said throttle control signal (TCS) and said cruise control signal (CCS) in response to whether said vehicle is moving or stationary.
Claim 6
Dependent Claim
57 words
Automatic speed control system as claimed in Claim 4, characterized in that said mode control means (104,106,178,300) includes: a first solid state switch (104) for connecting said cruise control signal (CCS) to said duty cycle translator input; and a second solid state switch (106) for connecting said throttle control signal (TCS) to said duty cycle translator input.
Claim 7
Dependent Claim
44 words
Automatic speed control system as claimed in Claim 5, characterized in that said first solid state switch (104) is normally closed and is opened in response to a signal (CCM) indicating that the cruise control means (100) is not in a cruise control mode.
Claim 8
Dependent Claim
43 words
Automatic speed control system as claimed in Claim 5, characterized in that said second solid state switch (106) is normally open and is closed in response to a signal (TCM) indicating that the throttle control means (102) is in a throttle control mode.
Claim 9
Dependent Claim
49 words
Automatic speed control system as claimed in Claim 3, characterized in that said means (310,312,334, 342) for generating a commanded throttle position signal (CTP) includes means (322,324,328) for generating an initial value of said commanded throttle position signal (CTP) which corresponds to a predetermined percentage of full throttle position.
Claim 10
Dependent Claim
54 words
Automatic speed control system as claimed in Claim 3, characterized in that said means (310,312, 334,342) for generating said commanded throttle position signal (CTP) includes: means (312,318,320) for incrementing said commanded throttle position signal (CTP) by a set increment; and means (310,314,316) for decrementing said commanded throttle position signal (CTP) by a set decrement.
Claim 11
Dependent Claim
19 words
Automatic speed control system as claimed in Claim 9, characterized in that said increment and decrement are varied independently.
Claim 12
Dependent Claim
18 words
Automatic speed control system as claimed in Claim 9, characterized in that said increment and decrement are equal.
References Cited (Backward Citations)
No citation records indexed.
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