A vehicle theft-prevention apparatus can include a wireless transceiver, a plurality of sensors configured to sense measurements proximate to a vehicle, and at least one computing device coupled to the plurality of sensors and the wireless transceiver. The at least one computing device can be configured to read a plurality of measurements of the plurality of sensors and determine that at least one event has occurred based on the plurality of measurements. The at least one computing device can store data corresponding to the at least one event on a local storage coupled to the at least one computing device and can transmit, via the wireless transceiver, the data corresponding to the at least one event to a remote service.

A vehicle theft-prevention apparatus can include at least one computing device coupled to at least one sensor and a wireless transceiver. The at least one sensor configured to sense measurements proximate to a vehicle. The at least one computing device can be configured to read a plurality of first measurements of the at least one sensor at a predetermined frequency, where the at least one sensor is located in a first position of the vehicle. The at least one computing device can be configured to receive a plurality of second measurements from at least one additional theft-prevention apparatus, where the at least one additional theft-prevention apparatus is located at a second position in the vehicle. The at least one computing device can determine that a person has entered the vehicle based on at least one of: the plurality of first measurements and the plurality of second measurements.

A vehicle theft-prevention apparatus can include at least one computing device couple to a plurality of sensors and a wireless transceiver. The plurality of sensors can be configured to sense measurements proximate to a vehicle. The at least one computing device can be configured to read a plurality of first measurements of a first sensor of the plurality of sensors. Based on the plurality of first measurements from the first sensor, the at least one computing device can determine that a key fob moved outside of a range of the first sensor. In response to the key fob moving outside of the range of the first sensor, the at least one computing device can transition to an armed state. The at least one computing device can read a plurality of second measurements from a subset of the plurality of sensors. Based on the plurality of second measurements, the at least one computing device can determine that a person has entered the vehicle.

A vehicle theft-prevention apparatus can include at least one computing device coupled to a first sensor and a second sensor that are configured to sense a first and a second type of measurement in a vehicle, respectively. The at least on computing device can be configured to read a plurality of measurements of the first type of measurement from the first sensor at a predetermined frequency. In response to one of the plurality of measurements exceeding a predetermined threshold, the at least one computing device can read at least one measurement from the second sensor. Based on the at least one measurement from the second sensor, the at least one computing device can determine that a person has entered the vehicle.

A vehicle theft-prevention apparatus can include a slip clutch mechanism, a locking mechanism, and a cylindrical body including a first portion and a second portion. The first portion can be configured to rotate about the second portion. The locking mechanism can be configured to engage based on rotation of the first portion relative to the second portion in a first direction, and disengage based on a rotation of the first portion relative to the second portion in a second direction. The slip clutch mechanism can be configured to prevent the locking mechanism from further engaging from rotation in the first direction relative to the second portion based on a magnitude of force applied.

A vehicle theft-prevention apparatus can include a first sensor, a second sensor, and at least one computing device coupled to the first and second sensors. The first sensor and second sensors can be configured to sense a first type and a second type of measurement, respectively. The at least one computing device can be configured to read a plurality of measurements of the first type at a predetermined frequency from within a vehicle. In response to one of the plurality of measurements meeting a predetermined threshold, the at least one computing device can read, from the second sensor, at least one measurement of the second type from within the vehicle. The at least one computing device can be configured to determine, based on the at least one measurement from the second sensor, that the one of the plurality of measurements that met the predetermined threshold corresponds to a false positive.

A vehicle theft-prevention apparatus can include a locking mechanism with an engagement component. The locking mechanism can be engaged via a first action to apply a force on the vehicle when in an engaged state. The locking mechanism can disengage, via a second action, to withdraw the force from the vehicle when in the engaged state. The locking mechanism can maintain a current state of the force in response to the first action and the second action when in a disengaged state. One or more computing devices can receive a command to enable or disable the locking mechanism. In response to receiving the command, the computing device can cause the engagement component to transition the locking mechanism from the disengaged state to the engaged state or from an engaged state to a disengaged state.

A vehicle theft-prevention apparatus can include at least one computing device coupled to a first sensor and a second sensor that are configured to sense a first and a second type of measurement in a vehicle, respectively. The at least on computing device can be configured to read a plurality of measurements of the first type of measurement from the first sensor at a predetermined frequency. In response to one of the plurality of measurements exceeding a predetermined threshold, the at least one computing device can read at least one measurement from the second sensor. Based on the at least one measurement from the second sensor, the at least one computing device can determine that a person has entered the vehicle.

A vehicle theft-prevention apparatus can include a slip clutch mechanism, a locking mechanism, and a cylindrical body including a first portion and a second portion. The first portion can be configured to rotate about the second portion. The locking mechanism can be configured to engage based on rotation of the first portion relative to the second portion in a first direction, and disengage based on a rotation of the first portion relative to the second portion in a second direction. The slip clutch mechanism can be configured to prevent the locking mechanism from further engaging from rotation in the first direction relative to the second portion based on a magnitude of force applied.

Disclosed is a system for detecting an operating state of a vehicle engine. The system comprises: an input coupled to a power line of a vehicle; means to filter out relatively high frequency transient noise components of a signal received from the power line; a first detector for receiving the filtered signal and detecting when transient noise associated with the power line rises above a first threshold and generating a first detection signal in response thereto; a second detector for receiving the filtered signal and detecting when the transient noise falls below a second threshold, which is lower than the first threshold, and generating a second detection signal in response thereto; and means for generating a first output signal in response to the first detection signal and a second output signal in response to the second detection signal.