Service brake and shift lever interlock system
First Claim
1. In a vehicle having a transmission with a shift lever movable between a drive position and a non-drive position, an engine and a service brake system operable in a brake applied mode and a brake release mode, a service brake and shift lever interlock system, comprising:
- (a) an electrical power supply means,(b) electrically actuated locking means for preventing shifting of the shift lever from the non-drive position,(c) a logic control circuit connected in series between the electrical power supply means and the locking means for controlling actuation of said locking means, said circuit including;
(1) ignition switch means that is in a closed, current conducting condition when the engine is operated or being started,(2) first switching means responsive to the position of the shift lever, said first switching means being placed in a current conducting condition when the shift lever is in the non-drive position and in a current non-conducting condition when the shift lever is in the drive position,(3) second switching means responsive to the mode of the service brake system, said second switching means being placed in a current conducting condition when the system is in the brake release mode and in a current non-conducting condition when the system is in the brake applied mode,whereby said logic control circuit electrically actuates said locking means to prevent shifting of the shift lever from the non-drive position when said ignition switch means is in the closed current-conducting condition and the service brake system is in the brake release mode.
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Accused Products
Abstract
A service brake and shift lever interlock system for a vehicle is operably controlled by a logic control circuit to prevent movement of the shift lever from the "Park" position when the ignition switch is in the "Start" or "Run" position and the service brake pedal is in a brake release position (i.e., the vehicle brakes are not applied). The interlock system does not prevent movement of the shift lever from the "Park" position under other conditions when the ignition switch is in the "Start" or "Run" position. An ignition interlock system prevents movement of the shift lever from the "Park" position when the ignition switch is in the "Lock" position.
39 Citations
20 Claims
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1. In a vehicle having a transmission with a shift lever movable between a drive position and a non-drive position, an engine and a service brake system operable in a brake applied mode and a brake release mode, a service brake and shift lever interlock system, comprising:
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(a) an electrical power supply means, (b) electrically actuated locking means for preventing shifting of the shift lever from the non-drive position, (c) a logic control circuit connected in series between the electrical power supply means and the locking means for controlling actuation of said locking means, said circuit including; (1) ignition switch means that is in a closed, current conducting condition when the engine is operated or being started, (2) first switching means responsive to the position of the shift lever, said first switching means being placed in a current conducting condition when the shift lever is in the non-drive position and in a current non-conducting condition when the shift lever is in the drive position, (3) second switching means responsive to the mode of the service brake system, said second switching means being placed in a current conducting condition when the system is in the brake release mode and in a current non-conducting condition when the system is in the brake applied mode, whereby said logic control circuit electrically actuates said locking means to prevent shifting of the shift lever from the non-drive position when said ignition switch means is in the closed current-conducting condition and the service brake system is in the brake release mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An interlock system for a vehicle having a transmission, an engine and a service brake movable between a brake applied position and a brake release position, comprising:
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(a) shift lever means movable between "Park" position and a drive position, (b) detent means for releasably retaining the shift lever means in a selected position, (c) an ignition switch mechanism having an "OFF" position, a "Lock" position, a "Start" position to start the engine and a "Run" position to operate the engine, (d) a locking lever operably connected to the ignition switch mechanism by connecting means for movement to (1) a locking position to prevent actuation of the detent means to release the shift lever when the ignition switch mechanism is in the "Lock" position with the shift lever means in the "Park" position and (2) an unlocking position permitting actuation of the detent means to release the shift lever form movement when the ignition switch mechanism is in the "Start" or "Run" position with the shift lever means in the "Park" position and with the brake pedal in the brake applied position, (e) electrically controlled lever locking means movable relative to the locking lever to (1) a retaining position to engage the locking lever in said locking position independently of said connecting means to block movement of the locking lever when the shift lever is in the "Park" position with the ignition switch mechanism in the "Start" position or "Run" position and with the brake pedal in the brake release position and (2) a release position to disengage from the locking lever to enable movement thereof to said unlocking position when the shift lever is in the "Park" position with ignition switch mechanism in the "Start" position or "Run" position and with brake pedal moved toward the brake applied position, whereby said shift lever means is prevented from movement from the "Park" position when the ignition switch mechanism is in the "Lock" position regardless of the position of the brake pedal and when the ignition switch mechanism is in the "Start" position or "Run" position with the brake pedal in the brake release position. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An interlock system for a vehicle having a transmission, an engine and a service brake system operable in a brake applied mode and brake release mode, comprising:
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(a) shift lever means movable between a non-drive position and a drive position, (b) detent means for releasably retaining the shift lever means in a selected position, (c) an ignition switch mechanism having a "Lock" position, a "Start" position to start the engine and a "Run" position to operate the engine, (d) a locking lever operably connected to the ignition switch mechanism by connecting means, (e) said connecting means moving said locking lever to a locking position when the ignition switch mechanism is moved to the "Lock" position with the shift lever releasably retained in said non-drive position such that said locking lever in said locking position prevents actuation of the detent means to release the shift lever when the ignition switch mechanism is in the "Lock" position, and (f) lever locking means comprising a solenoid and a pivotal retaining lever disposed between the solenoid and the locking lever for movement by said solenoid in response to the mode of the service brake system a) into engagement with the locking lever in said locking position independently of said connecting means to block movement of the locking lever when the shift lever is in the non-drive position with the ignition switch mechanism in the "Start" position or "Run" position and with the service brake system in the brake release mode and b) out of engagement with the locking lever to enable movement thereof from said locking position when the shift lever is in the non-drive position with the ignition switch mechanism in the "Start" position or "Run" position and with the service brake system in the brake applied mode such that said shift lever can be moved to the drive position. - View Dependent Claims (19, 20)
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Specification