Vehicle brake and engine interlock
First Claim
1. In a brake protection interlock system (23, 23a) for a vehicle (11, 11a) having ground engaging means (13, 13a), a brake (19, 19a), an engine (12, 12a), and drive delivery means (14, 14a) for transmitting power from said engine (12, 12a) to said ground engaging means (13, 13a), said drive delivery means (14, 14a) having a transmission (16, 16a) with at least one nondrive transmitting condition and at least one drive transmitting condition and having a clutch (18, 18a) which may be engaged and disengaged, and including first means (29, 29a) for preventing initiation of powered travel of said vehicle (11, 11a) with said brake (19, 19a) engaged by suppressing power output from said engine (12, 12a), the improvement comprising:
- second means (28, 28a) for causing said first means (29, 29a) to suppress power output from said engine (12, 12a) in response to said transmission (16, 16a) being in said drive transmitting condition while both of said brake (19, 19a) and said clutch (18, 18a) are engaged, andthird means (27, 27a) for enabling starting of said engine (12, 12a) with said transmission (16, 16a) in drive transmitting condition while said brake (19, 19a) is engaged by inactivating said second means (28, 28a) in response to said clutch (18, 18a) being in disengaged condition.
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Accused Products
Abstract
Brake wear in a vehicle (11, 11a) may be reduced by an interlock (23, 23a) which blocks delivery of power to the wheels (13, 13a) or the like if an attempt is made to initiate powered travel while the parking brake (19, 19a) remains engaged. Rather than neutralizing the vehicle transmission (16, 16a), the interlock (23, 23a) responds to an engaged parking brake (19, 19a) accompanied by drive transmitting conditions in the clutch (18, 18a) and transmission (16, 16a) by suppressing power output at the engine (12, 12a). In one form the system overrides the operator'"'"'s controls to limit fuel input to the engine (12) so that stalling occurs if start-up is attempted with the brake (19) engaged while in another form the system directly shuts down the engine (12a) under such conditions. Start-up of the vehicle (11, 11a) on a slope or under load is facilitated as the engine (12, 12a) may be accelerated while the transmission (16, 16a) is in gear and the brake (19, 19a) is still engaged. Use of the parking brake (19, 19a) for emergency stopping is facilitated as the retarding action of the engine (12, 12a) remains available to supplement such use of the parking brake (19, 19a).
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Citations
14 Claims
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1. In a brake protection interlock system (23, 23a) for a vehicle (11, 11a) having ground engaging means (13, 13a), a brake (19, 19a), an engine (12, 12a), and drive delivery means (14, 14a) for transmitting power from said engine (12, 12a) to said ground engaging means (13, 13a), said drive delivery means (14, 14a) having a transmission (16, 16a) with at least one nondrive transmitting condition and at least one drive transmitting condition and having a clutch (18, 18a) which may be engaged and disengaged, and including first means (29, 29a) for preventing initiation of powered travel of said vehicle (11, 11a) with said brake (19, 19a) engaged by suppressing power output from said engine (12, 12a), the improvement comprising:
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second means (28, 28a) for causing said first means (29, 29a) to suppress power output from said engine (12, 12a) in response to said transmission (16, 16a) being in said drive transmitting condition while both of said brake (19, 19a) and said clutch (18, 18a) are engaged, and third means (27, 27a) for enabling starting of said engine (12, 12a) with said transmission (16, 16a) in drive transmitting condition while said brake (19, 19a) is engaged by inactivating said second means (28, 28a) in response to said clutch (18, 18a) being in disengaged condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A brake protection interlock system for a vehicle (11, 11a) having ground engaging means (13, 13a), a brake (19, 19a), an engine (12, 12a), and drive delivery means (14, 14a) for transmitting power from said engine (12, 12a) to said ground engaging means (13, 13a), wherein said engine (12) has adjustable fuel input means (41) for selectively varying the fuel input rate to said engine (12), said fuel input means (41) having a fuel control element (44) movable between a minimum fuel input setting and a maximum fuel input setting, said drive delivery means (14, 14a) having a transmission (16, 16a) with at least one nondrive transmitting condition and at least one drive transmitting condition and having a clutch (18, 18a) which may be engaged and disengaged, wherein the improvement comprises:
interlock means (23, 23a) for preventing initiation of powered travel of said vehicle (11, 11a) with said brake (19, 19a) engaged by suppressing power output from said engine (12, 12a) in response to said transmission (16, 16a) being in said drive transmitting condition while both of said brake (19, 19a) and said clutch (18, 18a) are engaged, and wherein said interlock means (23) includes means (24, 29,
48) for shifting said fuel control element (44) towards said minimum fuel input setting in response to said drive transmitting condition in said transmission (16) accompanied by an engaged condition of both said brake (19) and said clutch (18).- View Dependent Claims (11)
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12. A brake interlock (23, 23a) for a vehicle (11, 11a) which has ground engaging means (13, 13a), a brake (19, 19a), an engine (12, 12a) and a drive clutch (18, 18a) and transmission (16, 16a) for delivering power from the engine (12, 12a) to the ground engaging means (13, 13a), wherein the drive clutch (18, 18a) has an engaged condition and a disengaged condition and wherein the transmission (16, 16a) is shiftable between a neutral condition and at least one drive delivering condition, and first means (29, 29a) for preventing initiation of powered travel of said vehicle (11, 11a) with said brake (19, 19a) engaged by suppressing operation of said engine (12, 12a), the combination comprising:
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brake condition sensor means (26, 26a) for detecting an engaged condition of said brake (19, 19a), transmission condition sensor means (28, 28a) for detecting a drive delivering condition in said transmission (16, 16a), and second means (24, 24a) for causing said first means (29, 29a) to suppress operation of said engine (12, 12a) when said sensor means (24, 24a) detect that said brake (19, 19a) is engaged while said transmission (16, 16a) is in said drive delivering condition and, clutch condition sensor means (27, 27a) for enabling starting of said engine (12, 12a) with said brake engaged and said transmission (16, 16a) in drive transmitting condition by inactivating said second means (24, 24a) when said clutch (18, 18a) is disengaged. - View Dependent Claims (13)
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14. A brake interlock for a vehicle which has ground engaging means (13), a brake (19), an engine (12) and a drive clutch (18) and transmission (16) for delivering power from the engine (12) to the ground engaging means (13), wherein said engine (12) includes a carburetor (41) having a throttle valve (42) with resilient means (48) for biasing said throttle valve (42) toward an engine idle setting and having a control element (47) for shifting said throttle valve (42) away from said engine idle setting against the action of said resilient means (38), wherein the drive clutch (18) has an engaged condition and a disengaged condition and wherein the transmission (16) is shiftable between a neutral condition and at least one drive delivering condition, the combination comprising:
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brake condition sensor means (26) for detecting an engaged condition of said brake (19), clutch condition sensor means (27) for detecting an engaged condition of said clutch (18), transmission condition sensor means (28) for detecting a drive delivering condition in said transmission (16), and means (29) for preventing initiation of powered travel of said vehicle (11) with said brake (19) engaged by suppressing operation of said engine (12) when said sensor means (24) detect that said brake (19) and said clutch (18) are both engaged while said transmission (16) is in said drive delivering condition, wherein said means (29) for suppressing operation of said engine (12) includes means (51) for temporarily disconnecting said control element (47) from said throttle valve (42) while said sensor means (24) detect an engaged condition of both said brake (19) and said drive clutch (18) accompanied by a drive delivering condition in said transmission (16).
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Specification